面向对象学习

习题3：

1. 请在草稿纸上手写一个单例模式的实现代码，拍照提交作业。

2. 请用组合设计模式编写程序，打印输出图 1 的窗口，窗口组件的树结构如图 2 所示，打印输出示例参考图 3。





package com.winform.components;

public abstract class Component {

protected String name;

public Component(String name) {

this.name = name;

}

public abstract void print();

}



public abstract class Container extends Component {

private List<Component> childComponent;



public Container(String name) {

super(name);

this.childComponent = new ArrayList<>();

}



public void addComponent(Component component) {

this.childComponent.add(component);

}

@Override

public void print() {

for (Component component : this.childComponent) {

component.print();

}

}

}



public class ButtonComponent extends Component {

public ButtonComponent(String name) {

super(name);

}

@Override

public void print() {

System.out.println(String.format("print Button(%S)", this.name));

}

}



public class FrameComponent extends Container {

public FrameComponent(String name) {

super(name);

}



@Override

public void print() {

System.out.println(String.format("print Frame(%S)", this.name));

super.print();

}

}



public class WinForm extends Container {

public WinForm(String name) {

super(name);

}

@Override

public void print() {

System.out.println(String.format("print WinForm(%S)", this.name));

super.print();

}

}