jtextfielddemo.java

学习Java的一些基本课件和源代码 对于初学者很有帮助的

//JTextFieldDemo.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JTextFieldDemo extends JFrame implements ActionListener{
	private Container content;
	private JLabel juserlabel;
	private JLabel jpasswordlabel;
	private JTextField jusertext;
	private JPasswordField jpasswordtext;
	
	public JTextFieldDemo()	{		
		super("文本字段与点击事件");
		content=getContentPane();
		content.setLayout(null);
		
		juserlabel=new JLabel("name:");
		juserlabel.setBounds(5,5,80,20);
		jusertext=new JTextField(25);
		jusertext.setBounds(90,5,100,20);
		jpasswordlabel=new JLabel("password:");
		jpasswordlabel.setBounds(5,50,80,20);
		jpasswordtext=new JPasswordField("");
		jpasswordtext.setBounds(90,50,100,20);
		content.add(juserlabel);
		content.add(jusertext);
		content.add(jpasswordlabel);
		content.add(jpasswordtext);
		jusertext.addActionListener(this);
		jpasswordtext.addActionListener(this);
		setSize(300,120);
		setVisible(true);
		}
	public void actionPerformed(ActionEvent e){
		String password=new String(jpasswordtext.getPassword());
		if(jusertext.getText().equals("user")&&password.equals("123"))
		   JOptionPane.showMessageDialog(null,"welcome!");
		   else    JOptionPane.showMessageDialog(null,"user name or password error!");
	}
	
	public  static void main(String[] args){
		JTextFieldDemo application=new JTextFieldDemo();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}