UML类图：
抽象父类：
package com.jthao.design.des.builder;
public abstract class Builder {
public abstract void partA();
public abstract void partB();
public abstract Product getResult();
}
构造类：
package com.jthao.design.des.builder;
public class ConcreteBuilderA extends Builder {
private Product product = new Product();
@Override
public void partA() {
product.add("A");
}
@Override
public void partB() {
product.add("B");
}
@Override
public Product getResult() {
return product;
}
}
构造类B：
package com.jthao.design.des.builder;
public class ConcreteBuilderB extends Builder {
private Product product = new Product();
@Override
public void partA() {
product.add("X");
}
@Override
public void partB() {
product.add("Y");
}
@Override
public Product getResult() {
return product;
}
}
转发类：
package com.jthao.design.des.builder;
public class Director {
public void construct(Builder builder) {
builder.partA();
builder.partB();
}
}
操作对象类：
package com.jthao.design.des.builder;
import java.util.ArrayList;
import java.util.List;
public class Product {
List<String> parts = new ArrayList<String>();
public void add(String part) {
parts.add(part);
}
public void show() {
for (String part : parts) {
System.out.println(part);
}
}
}
测试类：
package com.jthao.design.des.builder;
public class Test {
public static void main(String[] args) {
Director director = new Director();
ConcreteBuilderA cA = new ConcreteBuilderA();
director.construct(cA);
Product product = cA.getResult();
product.show();
}
}