训练营 - 第三周 - 作业一

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发布于: 2020 年 10 月 03 日
手写单例模式代码饿汉模式
懒汉模式
在写的过程中，发现对于synchronized volatile拼写不熟练。
用组合设计模式编写程序，输出指定内容
/**
 * 组件
 */
public interface Component {
    /**
     * 打印
     */
    abstract void print();
}
﻿
import java.util.List;
/**
 * win form
 */
public class WinForm implements Component {
    private String name;
    private List<Component> items;
    public WinForm(String name, List<Component> items) {
        this.name = name;
        this.items = items;
    }
    @Override
    public void print() {
        System.out.println("print WinForm(" + name + ")");
        if (items != null) {
            for (Component item : items) {
                item.print();
            }
        }
    }
}
﻿
import java.util.List;
/**
 * button
 */
public class Frame implements Component {
    private String name;
    private List<Component> items;
    public Frame(String name, List<Component> items) {
        this.name = name;
        this.items = items;
    }
    @Override
    public void print() {
        System.out.println("print Frame(" + name + ")");
        if (items != null) {
            for (Component item : items) {
                item.print();
            }
        }
    }
}
﻿
/**
 * button
 */
public class Button implements Component {
    private String name;
    public Button(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print Button(" + name + ")");
    }
}
﻿
/**
 * check box
 */
public class CheckBox implements Component {
    private String name;
    public CheckBox(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print CheckBox(" + name + ")");
    }
}
﻿
/**
 * lable
 */
public class Lable implements Component {
    private String name;
    public Lable(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print Lable(" + name + ")");
    }
}
﻿
/**
 * link lable
 */
public class LinkLable implements Component {
    private String name;
    public LinkLable(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print LinkLable(" + name + ")");
    }
}
﻿
/**
 * password box
 */
public class PasswordBox implements Component {
    private String name;
    public PasswordBox(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print PasswordBox(" + name + ")");
    }
}
﻿
/**
 * picture
 */
public class Picture implements Component {
    private String name;
    public Picture(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print Picture(" + name + ")");
    }
}
﻿
/**
 * text box
 */
public class TextBox implements Component {
    private String name;
    public TextBox(String name) {
        this.name = name;
    }
    @Override
    public void print() {
        System.out.println("print TextBox(" + name + ")");
    }
}
﻿
import java.util.Arrays;
/**
 * main
 */
public class Main {
    public static void main(String[] args) {
        Frame frame = new Frame("FRAME1",
                Arrays.asList(new Lable("用户名"),
                        new TextBox("文本框"),
                        new Lable("密码"),
                        new PasswordBox("密码框"),
                        new CheckBox("复选框"),
                        new TextBox("记住用户名"),
                        new LinkLable("忘记密码")));
        new WinForm("WINDOW窗口",
                Arrays.asList(new Picture("LOGO图片"),
                        new Button("登录"),
                        new Button("注册"), frame)).print();
    }
}
通过组合模式，把组件组成了树型结构，易于扩展。