java代码实例第42课

test042.java

package pack02;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class test042 extends JFrame
{

  public static void main(String[] args)
  {
    new test042();

  }

  public test042()
  {
    this.setTitle("习题");
    this.setLayout(new GridLayout(3,1,5,5));
    Container container1 = this.getContentPane();
    JTextField textField1 = new JTextField("用户名");
    JTextField textField2 = new JTextField();
    container1.add(textField1);
    container1.add(textField2);


    JButton button1 = new JButton("登录");
    JButton button2 = new JButton("重置");
    JPanel panel1 = new JPanel(new FlowLayout());
    panel1.add(button1);
    panel1.add(button2);
    container1.add(panel1);

    button1.addActionListener(new ActionListener()
    {

      @Override
      public void actionPerformed(ActionEvent e)
      {
        String text1 = textField1.getText();
        String text2= textField2.getText();

        if (text1.equals("admin") && text2.equals("xxx"))
        {
          JOptionPane.showMessageDialog(null, "登录成功");
        }
        else 
        {
          JOptionPane.showMessageDialog(null, "登录失败");

        }

      }
    });


    this.setSize(500,300);
    this.setVisible(true);
    this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

  }
}