package chapter8;

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 demo1 {

    public static void main(String[] args) {

        Frame f1=new Frame("加法计算器");

        int f1width=800;

        int f1heigh=600;

        f1.setLayout(null);

        f1.setBounds(0, 0, f1width, f1heigh);

        TextField tf1=new TextField();

        tf1.setBounds(f1width/6-50, f1heigh/3, 100,50);

        TextField tf2=new TextField();

        tf2.setBounds(f1width/6*3-50, f1heigh/3, 100,50);

        TextField tf3=new TextField();

        tf3.setBounds(f1width/6*5-50, f1heigh/3, 100,50);

        Button bt1=new Button("计算");

        bt1.setBounds(f1width/2-50, f1heigh/2+100, 100,100);

        f1.add(tf1);

        f1.add(tf2);

        f1.add(tf3);

        f1.add(bt1);

        f1.setVisible(true);

        MyWindowAdapter mwa=new MyWindowAdapter();

        f1.addWindowListener(mwa);

        MyActionListener mal=new MyActionListener(tf1,tf2,tf3);

        bt1.addActionListener(mal);

    }

    static class MyActionListener implements ActionListener{

        TextField tf1;

        TextField tf2;

        TextField tf3;

        MyActionListener(TextField tf1,TextField tf2,TextField tf3){

            this.tf1=tf1;

            this.tf2=tf2;

            this.tf3=tf3;

        }

        @Override

        public void actionPerformed(ActionEvent e) {

            int ans=Integer.parseInt(tf1.getText())+Integer.parseInt(tf2.getText());

            tf3.setText(""+ans);

        }

    }

    static class MyWindowAdapter extends WindowAdapter {

        public void windowClosing(WindowEvent we){

            System.exit(-1);

        }

    }

}