#107 Improve Private Class Data example JavaDoc

This commit is contained in:
Ilkka Seppala 2015-08-21 22:38:26 +03:00
parent 2bf00c3b5e
commit c32246e41d
2 changed files with 57 additions and 48 deletions

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@ -1,34 +1,38 @@
package com.iluwatar.privateclassdata;
/**
*
* The Private Class Data design pattern seeks to reduce exposure of attributes
* by limiting their visibility. It reduces the number of class attributes by
* encapsulating them in single data object. It allows the class designer to
* remove write privilege of attributes that are intended to be set only during
* construction, even from methods of the target class.
*
* In the example we have normal Stew class with some ingredients given in
* constructor. Then we have methods to enumerate the ingredients and to taste
* the stew. The method for tasting the stew alters the private members of the
* stew class.
*
* The problem is solved with the Private Class Data pattern. We introduce
* ImmutableStew class that contains StewData. The private data members of
* Stew are now in StewData and cannot be altered by ImmutableStew methods.
*
*/
public class App {
public static void main( String[] args ) {
// stew is mutable
Stew stew = new Stew(1, 2, 3, 4);
stew.mix();
stew.taste();
stew.mix();
// immutable stew protected with Private Class Data pattern
ImmutableStew immutableStew = new ImmutableStew(2, 4, 3, 6);
immutableStew.mix();
}
}
package com.iluwatar.privateclassdata;
/**
*
* The Private Class Data design pattern seeks to reduce exposure of attributes
* by limiting their visibility. It reduces the number of class attributes by
* encapsulating them in single data object. It allows the class designer to
* remove write privilege of attributes that are intended to be set only during
* construction, even from methods of the target class.
* <p>
* In the example we have normal {@link Stew} class with some ingredients given in
* constructor. Then we have methods to enumerate the ingredients and to taste
* the stew. The method for tasting the stew alters the private members of the
* {@link Stew} class.
*
* The problem is solved with the Private Class Data pattern. We introduce
* {@link ImmutableStew} class that contains {@link StewData}. The private data members of
* {@link Stew} are now in {@link StewData} and cannot be altered by {@link ImmutableStew} methods.
*
*/
public class App {
/**
* Program entry point
* @param args command line args
*/
public static void main( String[] args ) {
// stew is mutable
Stew stew = new Stew(1, 2, 3, 4);
stew.mix();
stew.taste();
stew.mix();
// immutable stew protected with Private Class Data pattern
ImmutableStew immutableStew = new ImmutableStew(2, 4, 3, 6);
immutableStew.mix();
}
}

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@ -1,14 +1,19 @@
package com.iluwatar.privateclassdata;
import org.junit.Test;
import com.iluwatar.privateclassdata.App;
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
}
package com.iluwatar.privateclassdata;
import org.junit.Test;
import com.iluwatar.privateclassdata.App;
/**
*
* Application test
*
*/
public class AppTest {
@Test
public void test() {
String[] args = {};
App.main(args);
}
}