JAVA设计模式----建造者模式详解

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Computer
{
    String mouse;
    String keyBoard;
    String screen;
}

public abstract class Builder
{
    //要建造的产品--子类也可以使用，因此是protected
    protected Computer computer=new Computer();
    //建造的步骤--顺序不固定
    //方法都是抽象的，具体实现交给子类完成
    public abstract Builder buildMouse();
    public abstract Builder buildKeyBoard();
    public abstract Builder buildScreen();
    //创建产品的方法，由当前抽象层实现
    public Computer createComputer()
    {
        return computer;
    }
}

//链式调用
public class DellComputerBuilder extends Builder
{
    @Override
    public Builder buildMouse()
    {
        System.out.println("戴尔鼠标组装");
        return this;
    }
    @Override
    public Builder buildKeyBoard()
    {
        System.out.println("戴尔键盘组装");
        return this;
    }
    @Override
    public Builder buildScreen()
    {
        System.out.println("戴尔屏幕组装");
        return this;
    }
}
public class ASUSComputerBuilder extends Builder{
    @Override
    public Builder buildMouse()
    {
        System.out.println("华硕鼠标组装");
        return this;
    }
    @Override
    public Builder buildKeyBoard()
    {
        System.out.println("华硕键盘组装");
        return this;
    }
    @Override
    public Builder buildScreen()
    {
        System.out.println("华硕屏幕组装");
        return this;
    }
}

public class ComputerDirector
{
    //构建电脑的方法
    public Computer construct(Builder builder)
    {
      //构建复杂产品对象
      Computer computer=builder.
              buildMouse().
              buildKeyBoard().
              buildScreen().
              createComputer();
      return computer;
    }
}

public class test
{
    @Test
    public void test()
    {
       //获得建造指挥官
        ComputerDirector computerDirector=new ComputerDirector();
      //创建电脑
      computerDirector.construct(new DellComputerBuilder());
      computerDirector.construct(new ASUSComputerBuilder());
    }
}

public class test
{
    @SneakyThrows//异常抛出throw,一个简单的try...catch写法
    @Test
    public void test()
    {
       //获得建造指挥官
        ComputerDirector computerDirector=new ComputerDirector();
      //创建电脑
        Class<?> dcb = Class.forName("construct.DellComputerBuilder");
        computerDirector.construct((Builder) dcb.newInstance());
        Class<?> acb = Class.forName("construct.ASUSComputerBuilder");
        computerDirector.construct((Builder) acb.newInstance());
    }
}