事件监听与计算机界面

1.事件监听

package 事件监听;
import java.awt.*;
import java.awt.event.*;

public class Frame2 extends Frame implements ActionListener{
private Button button1;
public Frame2()
{
  super("个人信息");
    this.setSize(250,200);//设计组件的尺寸
    this.setLocation(800,600);//设计组件显示的位置
    this.setBackground(Color.blue);//设计背景颜色
    this.setLayout(new FlowLayout());//设计容器为流布局，居中
    this.add(new Label("姓名"));
    this.add(new TextField("唯梦",20));
    this.add(new Label("性别"));
    this.add(new TextField("女",20));
    this.add(new Label("民族"));
    this.add(new TextField("汉",20));
    this.add(new Label("年龄"));
    this.add(new TextField("20",20));
    button1=new Button("OK");
    this.add(button1);
    button1.addActionListener(this);
    this.addWindowListener(new WinClose());
    this.setVisible(true);
}
public void actionPerformed(ActionEvent ev)
{
  if(ev.getSource()==button1)
  {
   System.out.print("welcome");
  }
}
public static void main(String arg[])
{
  new Frame2();
}
     class WinClose implements WindowListener
{
  public void windowClosing(WindowEvent ev)
  {
   System.exit(0);
  }
  public void windowOpened(WindowEvent ev) {}
  public void windowActivated(WindowEvent ev) {}
  public void windowDeactivated(WindowEvent ev) {}
  public void windowClose(WindowEvent ev) {}
  public void windowIconified(WindowEvent ev) {}
  public void windowDeiconified(WindowEvent ev) {}
  @Override
  public void windowClosed(WindowEvent arg0) {
   // TODO 自动生成的方法存根

  }
}
}

2.计算器界面

package 计算器;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Jisuanqi extends JFrame {

    public static void main(String[] args) {
    Jisuanqi frame = new Jisuanqi();

        frame.setTitle("计算器");
        frame.setSize(300,400);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.init();
        frame.setVisible(true);
    }

    private void init()
    {
        textField = new JTextField();
        textField.setEditable(false);
        textField.setHorizontalAlignment (JTextField.RIGHT);
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(4, 4));

        Container container = getContentPane();
        container.add(textField, BorderLayout.NORTH);
        container.add(panel, BorderLayout.CENTER);

        panel.add(useButton('7'));
        panel.add(useButton('8'));
        panel.add(useButton('9'));
        panel.add(useButton('+'));
        panel.add(useButton('4'));
        panel.add(useButton('5'));
        panel.add(useButton('6'));
        panel.add(useButton('-'));
        panel.add(useButton('1'));
        panel.add(useButton('2'));
        panel.add(useButton('3'));
        panel.add(useButton('*'));
        panel.add(useButton('0'));
        panel.add(useButton('.'));
        panel.add(useButton('='));
        panel.add(useButton('/'));
    }

    public JButton useButton (final char key)
    {
        JButton button = new JButton(String.valueOf(key));

        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent event)
            {
                JButton btn = (JButton) event.getSource();
                char key2 = btn.getText().charAt(0);

                action(key2);
            }
        });
        button.addKeyListener(new KeyAdapter()
        {
            public void keyReleased(KeyEvent event)
            {
                char key2 = event.getKeyChar ();
                action(key2);
            }
        });

        return button;
    }

    private void action(char key2)
    {
        if(reop)
        {
            textField.setText("");
            reop = false;
        }

        switch(key2)
        {
            case '+':
                a1 = Double.parseDouble(textField.getText());
                textField.setText("");
                operator = '+';
                break;
            case '-':
                a1 = Double.parseDouble(textField.getText());
                textField.setText("");
                operator = '-';
                break;
            case '*':
                a1= Double.parseDouble(textField.getText());
                textField.setText("");
                operator = '*';
                break;
            case '/':
                 a1= Double.parseDouble(textField.getText());
                textField.setText("");
                operator = '/';
                break;
            case '=':
                reop = true;
                a2 = Double.parseDouble(textField.getText());
                switch(operator)
                {
                    case '+':
                        result = a1 + a2;
                        break;
                    case '-':
                    result= a1 - a2;
                        break;
                    case '*':
                    result = a1 * a2;
                        break;
                    case '/':
                    result = a1 / a2;
                        break;
                    default: ;
                }
                textField.setText(String.valueOf(result));
                break;
           case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
            case '0':
            case '.':
                String text = textField.getText() + key2;
                textField.setText(text);
                break;
            default: ;
        }
    }
    private JTextField textField;
    private double a1, a2, result;
    private char operator;
    private boolean reop = false;
}}

事件监听与计算机界面

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