java 设置密文显示框

 1 package test; 2  3 import java.awt.Container; 4 import java.awt.Font; 5 import java.awt.GridLayout; 6 import java.io.File; 7 import java.util.EmptyStackException; 8 import java.util.Iterator; 9 import java.util.Stack;10 11 import javax.swing.Icon;12 import javax.swing.ImageIcon;13 import javax.swing.JButton;14 import javax.swing.JFrame;15 import javax.swing.JLabel;16 import javax.swing.JPanel;17 import javax.swing.JPasswordField;18 import javax.swing.JScrollPane;19 import javax.swing.JSpinner;20 import javax.swing.JSplitPane;21 import javax.swing.JTabbedPane;22 import javax.swing.JTextField;23 import javax.swing.JToggleButton;24 25 public class ImplementsDemo {26     public static void main(String[] args) throws EmptyStackException{27         JFrame f=new JFrame("Welcome To Earth!");28         JPasswordField ps1=new JPasswordField();29         JPasswordField ps2=new JPasswordField();30         ps2.setEchoChar('#');31         JLabel lab1=new JLabel("默认的回显:");32         JLabel lab2=new JLabel("回显设置@:");33         lab1.setBounds(10, 10, 100, 20);34         lab2.setBounds(10, 40, 100, 20);35         ps1.setBounds(110, 10, 80, 20);36         ps2.setBounds(110, 40, 50, 20);37         f.setLayout(null);38         f.add(lab2);39         f.add(ps1);40         f.add(lab1);41         f.add(ps2);42         f.setSize(300,100);43         f.setLocation(300,200);44         f.setVisible(true);45         46     }47     48 }