Update Method pattern (#1106)
* Add update method pattern * Add unit tests * Add README.md * Resolve conflict
This commit is contained in:
Azureyjt
Ilkka Seppälä
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.updatemethod;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* This pattern simulate a collection of independent objects by telling each to
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* process one frame of behavior at a time. The game world maintains a collection
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* of objects. Each object implements an update method that simulates one frame of
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* the object’s behavior. Each frame, the game updates every object in the collection.
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*/
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public class App {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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private static final int GAME_RUNNING_TIME = 2000;
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/**
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* Program entry point.
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* @param args runtime arguments
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*/
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public static void main(String[] args) {
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try {
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var world = new World();
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var skeleton1 = new Skeleton(1, 10);
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var skeleton2 = new Skeleton(2, 70);
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var statue = new Statue(3, 20);
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world.addEntity(skeleton1);
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world.addEntity(skeleton2);
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world.addEntity(statue);
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world.run();
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Thread.sleep(GAME_RUNNING_TIME);
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world.stop();
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} catch (InterruptedException e) {
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LOGGER.error(e.getMessage());
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}
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}
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}
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
|
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.updatemethod;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Abstract class for all the entity types.
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*/
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public abstract class Entity {
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protected final Logger logger = LoggerFactory.getLogger(this.getClass());
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protected int id;
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protected int position;
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public Entity(int id) {
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this.id = id;
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this.position = 0;
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}
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public abstract void update();
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public int getPosition() {
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return position;
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}
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public void setPosition(int position) {
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this.position = position;
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}
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}
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@ -0,0 +1,78 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
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* of this software and associated documentation files (the "Software"), to deal
|
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* in the Software without restriction, including without limitation the rights
|
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
|
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.updatemethod;
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/**
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* Skeletons are always patrolling on the game map. Initially all the skeletons
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* patrolling to the right, and after them reach the bounding, it will start
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* patrolling to the left. For each frame, one skeleton will move 1 position
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* step.
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*/
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public class Skeleton extends Entity {
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private static final int PATROLLING_LEFT_BOUNDING = 0;
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private static final int PATROLLING_RIGHT_BOUNDING = 100;
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protected boolean patrollingLeft;
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/**
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* Constructor of Skeleton.
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*
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* @param id id of skeleton
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*/
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public Skeleton(int id) {
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super(id);
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patrollingLeft = false;
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}
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/**
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* Constructor of Skeleton.
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*
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* @param id id of skeleton
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* @param postition position of skeleton
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*/
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public Skeleton(int id, int postition) {
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super(id);
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this.position = position;
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patrollingLeft = false;
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}
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@Override
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public void update() {
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if (patrollingLeft) {
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position -= 1;
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if (position == PATROLLING_LEFT_BOUNDING) {
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patrollingLeft = false;
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}
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} else {
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position += 1;
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if (position == PATROLLING_RIGHT_BOUNDING) {
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patrollingLeft = true;
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}
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}
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logger.info("Skeleton " + id + " is on position " + position + ".");
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}
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}
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@ -0,0 +1,69 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
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* in the Software without restriction, including without limitation the rights
|
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
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*
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* The above copyright notice and this permission notice shall be included in
|
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* all copies or substantial portions of the Software.
|
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
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* THE SOFTWARE.
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*/
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package com.iluwatar.updatemethod;
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/**
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* Statues shoot lightning at regular intervals.
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*/
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public class Statue extends Entity {
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protected int frames;
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protected int delay;
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/**
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* Constructor of Statue.
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*
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* @param id id of statue
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*/
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public Statue(int id) {
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super(id);
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this.frames = 0;
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this.delay = 0;
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}
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/**
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* Constructor of Statue.
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*
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* @param id id of statue
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* @param delay the number of frames between two lightning
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*/
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public Statue(int id, int delay) {
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super(id);
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this.frames = 0;
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this.delay = delay;
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}
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@Override
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public void update() {
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if (++ frames == delay) {
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shootLightning();
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frames = 0;
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}
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}
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private void shootLightning() {
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logger.info("Statue " + id + " shoots lightning!");
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}
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}
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114
update-method/src/main/java/com/iluwatar/updatemethod/World.java
Normal file
114
update-method/src/main/java/com/iluwatar/updatemethod/World.java
Normal file
@ -0,0 +1,114 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
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* in the Software without restriction, including without limitation the rights
|
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
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* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
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*
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* The above copyright notice and this permission notice shall be included in
|
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* all copies or substantial portions of the Software.
|
||||
*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
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* THE SOFTWARE.
|
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*/
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package com.iluwatar.updatemethod;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* The game world class. Maintain all the objects existed in the game frames.
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*/
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public class World {
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private static final Logger LOGGER = LoggerFactory.getLogger(World.class);
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protected List<Entity> entities;
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protected volatile boolean isRunning;
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public World() {
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entities = new ArrayList<>();
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isRunning = false;
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}
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/**
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* Main game loop. This loop will always run until the game is over. For
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* each loop it will process user input, update internal status, and render
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* the next frames. For more detail please refer to the game-loop pattern.
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*/
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private void gameLoop() {
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while (isRunning) {
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processInput();
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update();
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render();
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}
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}
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/**
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* Handle any user input that has happened since the last call. In order to
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* simulate the situation in real-life game, here we add a random time lag.
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* The time lag ranges from 50 ms to 250 ms.
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*/
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private void processInput() {
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try {
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int lag = new Random().nextInt(200) + 50;
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Thread.sleep(lag);
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} catch (InterruptedException e) {
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LOGGER.error(e.getMessage());
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}
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}
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/**
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* Update internal status. The update method pattern invoke udpate method for
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* each entity in the game.
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*/
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private void update() {
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for (var entity : entities) {
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entity.update();
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}
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}
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/**
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* Render the next frame. Here we do nothing since it is not related to the
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* pattern.
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*/
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private void render() {}
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/**
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* Run game loop.
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*/
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public void run() {
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LOGGER.info("Start game.");
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isRunning = true;
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var thread = new Thread(this::gameLoop);
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thread.start();
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}
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/**
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* Stop game loop.
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*/
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public void stop() {
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LOGGER.info("Stop game.");
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isRunning = false;
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}
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public void addEntity(Entity entity) {
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entities.add(entity);
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}
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}
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@ -0,0 +1,35 @@
|
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/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.updatemethod;
|
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|
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import org.junit.Test;
|
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|
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public class AppTest {
|
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|
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@Test
|
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public void testMain() {
|
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String[] args = {};
|
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App.main(args);
|
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}
|
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}
|
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@ -0,0 +1,78 @@
|
||||
/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.updatemethod;
|
||||
|
||||
import org.junit.After;
|
||||
import org.junit.Assert;
|
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import org.junit.Before;
|
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import org.junit.Test;
|
||||
|
||||
public class SkeletonTest {
|
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|
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private Skeleton skeleton;
|
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|
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@Before
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public void setup() {
|
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skeleton = new Skeleton(1);
|
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}
|
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|
||||
@After
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public void tearDown() {
|
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skeleton = null;
|
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}
|
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|
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@Test
|
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public void testUpdateForPatrollingLeft() {
|
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skeleton.patrollingLeft = true;
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skeleton.setPosition(50);
|
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skeleton.update();
|
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Assert.assertEquals(49, skeleton.getPosition());
|
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}
|
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|
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@Test
|
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public void testUpdateForPatrollingRight() {
|
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skeleton.patrollingLeft = false;
|
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skeleton.setPosition(50);
|
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skeleton.update();
|
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Assert.assertEquals(51, skeleton.getPosition());
|
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}
|
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|
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@Test
|
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public void testUpdateForReverseDirectionFromLeftToRight() {
|
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skeleton.patrollingLeft = true;
|
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skeleton.setPosition(1);
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skeleton.update();
|
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Assert.assertEquals(0, skeleton.getPosition());
|
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Assert.assertEquals(false, skeleton.patrollingLeft);
|
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}
|
||||
|
||||
@Test
|
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public void testUpdateForReverseDirectionFromRightToLeft() {
|
||||
skeleton.patrollingLeft = false;
|
||||
skeleton.setPosition(99);
|
||||
skeleton.update();
|
||||
Assert.assertEquals(100, skeleton.getPosition());
|
||||
Assert.assertEquals(true, skeleton.patrollingLeft);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,58 @@
|
||||
/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.updatemethod;
|
||||
|
||||
import org.junit.After;
|
||||
import org.junit.Assert;
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
public class StatueTest {
|
||||
|
||||
private Statue statue;
|
||||
|
||||
@Before
|
||||
public void setup() {
|
||||
statue = new Statue(1, 20);
|
||||
}
|
||||
|
||||
@After
|
||||
public void tearDown() {
|
||||
statue = null;
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUpdateForPendingShoot() {
|
||||
statue.frames = 10;
|
||||
statue.update();
|
||||
Assert.assertEquals(11, statue.frames);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUpdateForShooting() {
|
||||
statue.frames = 19;
|
||||
statue.update();
|
||||
Assert.assertEquals(0, statue.frames);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,63 @@
|
||||
/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.updatemethod;
|
||||
|
||||
import org.junit.After;
|
||||
import org.junit.Assert;
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
public class WorldTest {
|
||||
|
||||
private World world;
|
||||
|
||||
@Before
|
||||
public void setup() {
|
||||
world = new World();
|
||||
}
|
||||
|
||||
@After
|
||||
public void tearDown() {
|
||||
world = null;
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testRun() {
|
||||
world.run();
|
||||
Assert.assertEquals(true, world.isRunning);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testStop() {
|
||||
world.stop();
|
||||
Assert.assertEquals(false, world.isRunning);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testAddEntity() {
|
||||
var entity = new Skeleton(1);
|
||||
world.addEntity(entity);
|
||||
Assert.assertEquals(entity, world.entities.get(0));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user