layoutaction.java

来自「java Java书籍里面有很多初学java的资料」· Java 代码 · 共 40 行

import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.*;
public class LayoutAction extends JFrame{
  public LayoutAction() {
    this.setTitle("a layoutAction class");
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  public void DrawContent(){
   JPanel toppanel = new JPanel();
  final JTextField mytext = new JTextField(15);
   toppanel.add(mytext);
   this.getContentPane().add(toppanel,BorderLayout.PAGE_START);
  JPanel keypanel = new JPanel();
  keypanel.setLayout(new GridLayout(0,4));

  for (int i = 0; i < 10; i++) {
final    JButton keybutton = new JButton(""+i);
    keypanel.add(keybutton);
    keybutton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                 mytext.setText(mytext.getText()+keybutton.getText());
                }
              });
  }
  keypanel.add(new JButton("+"));
  keypanel.add(new JButton("="));
  this.getContentPane().add(keypanel,BorderLayout.CENTER);
   this.pack();
   this.setVisible(true);
  }

  public static void main(String[] args) {
    LayoutAction la = new LayoutAction();
    la.DrawContent();
  }

}