意图:将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。
public class Main {
public static void main(String[] args) {
Director director = new Director();
Builder builder1 = new Builder1();
director.Construct(builder1);
Product product1 = builder1.getResult();
product1.show();
Builder builder2 = new Builder2();
director.Construct(builder2);
Product product2 = builder2.getResult();
product2.show();
}
}
class Director {
public void Construct(Builder builder) {
builder.BuildPart();
}
}
abstract class Builder {
public abstract void BuildPart();
public abstract Product getResult();
}
class Builder1 extends Builder {
Product product = new Product();
@Override
public void BuildPart() {
product.Add("A");
product.Add("B");
product.Add("C");
product.Add("D");
product.Add("E");
product.Add("F");
}
@Override
public Product getResult() {
return product;
}
}
class Builder2 extends Builder {
Product product = new Product();
@Override
public void BuildPart() {
product.Add("A");
product.Add("B");
product.Add("C");
}
@Override
public Product getResult() {
return product;
}
}
class Product {
List<String> parts = new ArrayList<String>();
public void Add(String part) {
parts.add(part);
}
public void show() {
System.out.print("产品的组成:");
for (String s : parts)
System.out.print(s + " ");
System.out.print("\n");
}
}