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BAEL-3091: The Prototype Pattern in Java (further changes based on suggestions)

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This commit is contained in:
Vivek Balasubramaniam 2019-11-22 10:47:01 +05:30
parent aafe3d90df
commit 240c9fa3c4
3 changed files with 34 additions and 3 deletions
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4
patterns/design-patterns-creational/src/main/java/com/baeldung/prototype/PineTree.java
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@ -15,7 +15,9 @@ public class PineTree extends Tree {
@Override
public Tree copy() {
return new PineTree(this.getMass(), this.getHeight());
PineTree pineTreeClone = new PineTree(this.getMass(), this.getHeight());
pineTreeClone.setPosition(this.getPosition());
return pineTreeClone;
}
}

6
patterns/design-patterns-creational/src/main/java/com/baeldung/prototype/PlasticTree.java
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@ -8,14 +8,16 @@ public class PlasticTree extends Tree {
super(mass, height);
this.name = "PlasticTree";
}
public String getName() {
return name;
}
@Override
public Tree copy() {
return new PlasticTree(this.getMass(), this.getHeight());
PlasticTree plasticTreeClone = new PlasticTree(this.getMass(), this.getHeight());
plasticTreeClone.setPosition(this.getPosition());
return plasticTreeClone;
}
}

27
patterns/design-patterns-creational/src/test/java/com/baeldung/prototype/TreePrototypeUnitTest.java
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@ -2,6 +2,10 @@ package com.baeldung.prototype;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.util.Arrays;
import java.util.List;
import static java.util.stream.Collectors.toList;
import org.junit.jupiter.api.Test;
public class TreePrototypeUnitTest {
@ -38,4 +42,27 @@ public class TreePrototypeUnitTest {
assertEquals(position, pineTree.getPosition());
assertEquals(otherPosition, anotherPineTree.getPosition());
}
@Test
public void givenA_ListOfTreesWhenClonedThenCreateListOfClones() {
double mass = 10.0;
double height = 3.7;
Position position = new Position(3, 7);
Position otherPosition = new Position(4, 8);
PlasticTree plasticTree = new PlasticTree(mass, height);
plasticTree.setPosition(position);
PineTree pineTree = new PineTree(mass, height);
pineTree.setPosition(otherPosition);
List<Tree> trees = Arrays.asList(plasticTree, pineTree);
List<Tree> treeClones = trees.stream().map(Tree::copy).collect(toList());
Tree plasticTreeClone = treeClones.get(0);
assertEquals(mass, plasticTreeClone.getMass());
assertEquals(height, plasticTreeClone.getHeight());
assertEquals(position, plasticTreeClone.getPosition());
}
}