java-design-patterns/command/src/main/java/com/iluwatar/App.java

package com.iluwatar;

/**
 *
 * In Command pattern actions are objects that can be executed and undone. The
 * commands in this example are spells cast by the wizard on the goblin.
 *
 */
public class App {

    public static void main(String[] args) {
        Wizard wizard = new Wizard();
        Goblin goblin = new Goblin();

        goblin.printStatus();

        wizard.castSpell(new ShrinkSpell(), goblin);
        goblin.printStatus();

        wizard.castSpell(new InvisibilitySpell(), goblin);
        goblin.printStatus();
        wizard.undoLastSpell();
        goblin.printStatus();
    }
}