import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class Demo {

    public static void main(String[] args) {

        Mygson();

    }

    private static void Mygson() {

        new MyFrame();

    }

}

class MyFrame extends Frame implements Action {

    public MyFrame(){

        //设置宽高

        this.setSize(600,400);

        //设置窗体的标题

        this.setTitle("GUI");

        //创建按钮

        Button button = new Button("点击");

        //按钮添加点击事件

        button.addActionListener(this);

        //给窗体添加点击事件

        this.addWindowListener(new WindowAdapter() {

            @Override

            public void windowClosing(WindowEvent e) {

                super.windowClosing(e);

                System.exit(0);

            }

        });

        //创建一个线性布局

        FlowLayout flowLayout = new FlowLayout();

        //把布局应用到窗体上

        this.setLayout(flowLayout);

        //把按钮添加窗体上

        this.add(button);

        this.setVisible(true);

    }

    @Override

    public Object getValue(String key) {

        return null;

    }

    @Override

    public void putValue(String key, Object value) {

    }

    //单机事件处理方法；

    @Override

    public void actionPerformed(ActionEvent e) {

        System.out.println("点击事件触发");

    }

}

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class Demo {

    public static void main(String[] args) {

        Mygson();

    }

    private static void Mygson() {

        new MyFrame();

    }

}

class MyFrame extends Frame implements MoneySetListen{

    private Label label = new Label("金额");

    private Button button = new Button("购买");

    public MyFrame(){

        this.setSize(400,200);

        FlowLayout flowLayout = new FlowLayout();

        this.setLayout(flowLayout);

        this.setTitle("GUI");

        this.add(label);

        this.add(button);

        this.setVisible(true);

        button.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                new MyFrame2().setMoneySetListen(MyFrame.this);

            }

        });

        this.addWindowListener(new WindowAdapter() {

            @Override

            public void windowClosing(WindowEvent e) {

                super.windowClosing(e);

                System.exit(0);

            }

        });

    }

    @Override

    public void setMoney(String money) {

        label.setText(money);

    }

}

class MyFrame2 extends Frame{

    private MoneySetListen moneySetListen;

    private TextField text = new TextField(20);

    private Button button = new Button("确认");

    public MyFrame2(){

        this.setSize(400,200);

        FlowLayout flowLayout = new FlowLayout();

        this.setLayout(flowLayout);

        this.setTitle("GUI");

        this.add(text);

        this.add(button);

        this.setVisible(true);

        button.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                String money = text.getText();

                moneySetListen.setMoney(money);

            }

        });

        this.addWindowListener(new WindowAdapter() {

            @Override

            public void windowClosing(WindowEvent e) {

                super.windowClosing(e);

                System.exit(0);

            }

        });

    }

    //MyFrame 继承了MoneySetListen 接口，则可以用接口来接受this,然后调用this的setMoney方法;

    public void setMoneySetListen(MoneySetListen moneySetListen){

        this.moneySetListen = moneySetListen;

    }

}

interface MoneySetListen{

    public void setMoney(String money);

}