怎么将java中jpassworld的内容显示出来
时间: 2023-06-15 20:05:02 浏览: 58
Java中的JPasswordField组件是用于输入密码的文本框,它的内容默认是被隐藏的。如果需要将其内容显示出来,可以通过以下步骤实现:
1. 获取JPasswordField组件的字符数组内容
```java
char[] passwordChars = passwordField.getPassword();
```
2. 将字符数组转换为字符串
```java
String passwordString = new String(passwordChars);
```
3. 将字符串设置到另一个文本框或标签中以显示密码
```java
JLabel passwordLabel = new JLabel(passwordString);
```
完整示例代码如下:
```java
import javax.swing.*;
import java.awt.event.*;
public class PasswordFieldDemo extends JFrame {
private JPasswordField passwordField;
private JButton showButton;
public PasswordFieldDemo() {
passwordField = new JPasswordField();
showButton = new JButton("Show Password");
showButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
char[] passwordChars = passwordField.getPassword();
String passwordString = new String(passwordChars);
JOptionPane.showMessageDialog(null, passwordString);
}
});
JPanel panel = new JPanel();
panel.add(passwordField);
panel.add(showButton);
setContentPane(panel);
pack();
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
PasswordFieldDemo demo = new PasswordFieldDemo();
}
}
```
在示例代码中,点击按钮后会弹出一个对话框,显示JPasswordField中输入的密码。你也可以将其显示在另一个文本框或标签中。
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