?? passwordfieldtest.java
字號:
//PasswordFieldTest.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class PasswordFieldTest
{
public static void main(String[] args)
{
PasswordFieldFrame frame = new PasswordFieldFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class PasswordFieldFrame extends JFrame
{
public PasswordFieldFrame()
{
setTitle("PasswordFieldTest");
setSize(WIDTH, HEIGHT);
Container contentPane = getContentPane();
//新建文檔監聽器
DocumentListener showListener = new ShowListener();
//建立容納密碼域的面板
JPanel textPanel = new JPanel();
myPassword = new JPasswordField(20);
//為密碼域安裝一個文檔監聽器
myPassword.getDocument().addDocumentListener(showListener);
textPanel.add(myPassword);
checkPassword = new JTextField(20);
checkPassword.setEditable(false);
textPanel.add(checkPassword);
contentPane.add(textPanel);
}
//獲取密碼域的內容,顯示在文本域中
public void showPassword()
{
char[] s;
String gets;
//獲取密碼域的內容
s = myPassword.getPassword();
gets = new String(s);
checkPassword.setText(gets);
}
private class ShowListener
implements DocumentListener
{
public void insertUpdate(DocumentEvent e)
{
showPassword();
}
public void removeUpdate(DocumentEvent e)
{
showPassword();
}
public void changedUpdate(DocumentEvent e)
{
}
}
public static final int WIDTH = 350;
public static final int HEIGHT = 150;
private JPasswordField myPassword;
private JTextField checkPassword;
}
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