架构师训练营第三周课后作业

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发布于: 2020 年 06 月 23 日
手写单例模式
程序员的字真是没眼看，老师要求必须手写，手写了之后还是写了个代码版本
public class Pool {
    private static volatile Pool pool ;
    public static Pool get(){
        if(Objects.isNull(pool)){
            synchronized (Pool.class){
                if(Objects.isNull(pool)){
                    pool = new Pool();
                }
            }
        }
        return pool;
    }
}
﻿
用组合模式打印图中窗口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。
﻿
﻿
public class Composite {
    public static void main(String[] args) {
        Component winForm = new WinForm("WINDOW窗口");
        winForm.add(new Picture("LOGO图片"));
        winForm.add(new Button("登陆"));
        winForm.add(new Button("注册"));
        Component frame = new Frame("FRAME1");
        winForm.add(frame);
        frame.add(new Label("用户名"));
        frame.add(new TextBox("文本框"));
        frame.add(new Label("密码"));
        frame.add(new PasswordBox("密码框"));
        frame.add(new CheckBox("复选框"));
        frame.add(new TextBox("记住用户名"));
        frame.add(new LinkLabel("忘记密码"));
        winForm.print();
    }
    private static abstract class Component {
        private List<Component> components = new ArrayList<>();
        public void add(Component component){
            components.add(component);
        }
        public abstract String getName();
        public void print() {
            System.out.println("print " + getName());
            components.forEach(Component::print);
        }
    }
    private static class WinForm extends Component {
        private String name;
        public WinForm(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "WinForm(" + name + ")";
        }
    }
    private static class Picture extends Component {
        private String name;
        public Picture(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "Picture(" + name + ")";
        }
    }
    private static class Button extends Component {
        private String name;
        public Button(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "Button(" + name + ")";
        }
    }
    private static class Frame extends Component {
        private String name;
        public Frame(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "Frame(" + name + ")";
        }
    }
    private static class Label extends Component {
        private String name;
        public Label(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "Label(" + name + ")";
        }
    }
    private static class TextBox extends Component {
        private String name;
        public TextBox(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "TextBox(" + name + ")";
        }
    }
    private static class PasswordBox extends Component {
        private String name;
        public PasswordBox(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "PasswordBox(" + name + ")";
        }
    }
    private static class CheckBox extends Component {
        private String name;
        public CheckBox(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "CheckBox(" + name + ")";
        }
    }
    private static class LinkLabel extends Component {
        private String name;
        public LinkLabel(String name) {
            this.name = name;
        }
        @Override
        public String getName() {
            return "LinkLabel(" + name + ")";
        }
    }
}
程序输出结果:
print WinForm(WINDOW窗口)
print Picture(LOGO图片)
print Button(登陆)
print Button(注册)
print Frame(FRAME1)
print Label(用户名)
print TextBox(文本框)
print Label(密码)
print PasswordBox(密码框)
print CheckBox(复选框)
print TextBox(记住用户名)
print LinkLabel(忘记密码)
﻿
发布于: 2020 年 06 月 23 日阅读数: 52
原文链接:【http://xie.infoq.cn/article/91d3c37631b56badfed6f699d】。未经作者许可，禁止转载。
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