如何检查JPassword字段是否为

• Z时代
• 2024-01-10
• 分类：问答

我想在Swing中检查用户名和密码。如何检查JPassword字段是否为

此检查适用于用户名，但不适用于JPaswordfield。我张贴了相关代码：

//Here I get the password 
Char[] pwd = jt1.getPassword(); 
String s = new String(pwd); //converting char to string 
String p = s; 
//In the JButton checking username and password(Username check works fine but not passwordfield) 
jb.addActionListener(new ActionListener() { 
         public void actionPerformed(ActionEvent e) 
          { 
          if ((jt.getText().length()) == 0) 
          { 
            JFrame jf1 = new JFrame("UserName"); 
             jf1.setSize(401, 401); 
             //jf1.setVisible(true); 
             jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE); 
             JOptionPane.showMessageDialog(jf1, "User Name is empty"); 
          } 
         else if((p.length()) == 0) 
          { 
            JFrame jf1 = new JFrame("Password"); 
             jf1.setSize(401, 401); 
             //jf1.setVisible(true); 
             jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE); 
             JOptionPane.showMessageDialog(jf1, "Password is empty"); 
          } 
         else if ((p.length() == 0) && (jt.getText().length()) == 0) 
          { 
            JFrame jf1 = new JFrame("UserName and Password"); 
             jf1.setSize(401, 401); 
             //jf1.setVisible(true); 
             jf1.setDefaultCloseOperation(jf1.EXIT_ON_CLOSE); 
             JOptionPane.showMessageDialog(jf1, "Username and Password is 
empty"); 
          } 
          else 
          { //go to another method} 
Can someone help 

回答：

JPasswordField jpf... 
if(jpf.getPassword().length == 0) { 
    // it is empty 
}else { 
    // it is not empty 
} 

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