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1.程序运行截图：
2.程序实现的功能
1）进入程序时，程序会询问你输入一个密码
2）进入键盘界面后，按下数字0-9可以输入一个字符，按取消按钮可以退出程序，重置按钮可以将上面的JPasswordField变为空，按下确定按钮，提示输入的密码是否正确
3.程序代码
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import javax.swing.*;
public class FrameTest_20150214
{
//密码
public static char[] correctPassword = {‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘};
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
//输入一个密码，要求密码全部为数字组成
boolean isNumber = false;
String inputPassword = "";
while(!isNumber)
{
inputPassword = JOptionPane.showInputDialog("请输入一个密码");
isNumber = inputPassword.matches("[0-9]+");
}
correctPassword = inputPassword.toCharArray();
//打开窗体
TestFrame testFrame = new TestFrame(correctPassword);
testFrame.setVisible(true);
}
});
}
}
//密码输入窗体
class TestFrame extends JFrame
{
private static final long serialVersionUID = 1L;
private static final int DEFAULT_WIDTH = 600;
private static final int DEFAULT_HEIGHT = 400;
//密码输入框
JPasswordField psdDisplay;
//数字键盘容器
JPanel panel;
//数字键盘上的按钮
JButton btnNum1; //按键1
JButton btnNum2; //按键2
JButton btnNum3; //按键3
JButton btnNum4; //按键4
JButton btnNum5; //按键5
JButton btnNum6; //按键6
JButton btnNum7; //按键7
JButton btnNum8; //按键8
JButton btnNum9; //按键9
JButton btnNum0; //按键0
JButton btnDot; //小数点
JButton btnNum00; //按键00
JButton btnOK; //确认
JButton btnCancel; //取消
JButton btnReset; //重置
//正确的密码
private char[] correctPassword;
//构造函数
public TestFrame(char[] password)
{
correctPassword = password;
SetTestFrame();
SetControls();
}
//设置窗体
private void SetTestFrame()
{
//窗口大小
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
//窗口居中
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
setLocation(
(dim.width - getSize().width) / 2,
(dim.height - getSize().height) / 2);
//标题
setTitle("This is a Frame for test!");
//使窗体边界无法改变（也无法进行最大化）
setResizable(false);
//关闭窗口时退出程序
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//设置控件
private void SetControls()
{
setLayout(new BorderLayout());
//密码输入框
psdDisplay = new JPasswordField();
psdDisplay.setEchoChar(‘*‘);
psdDisplay.setHorizontalAlignment(JTextField.CENTER);
psdDisplay.setFont(new Font("Times New Roman", Font.BOLD, 60));
psdDisplay.setEditable(false);
add(psdDisplay, BorderLayout.NORTH);
//要绑定的事件
InsertNumberAction insertNumber = new InsertNumberAction();
OkCommandAction okCommand = new OkCommandAction();
CancelCommandAction cancelCommand = new CancelCommandAction();
ResetCommandAction resetCommand = new ResetCommandAction();
//输入键盘
panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
//数字7
btnNum7 = new JButton("7");
btnNum7.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum7.addActionListener(insertNumber);
panel.add(btnNum7);
//数字8
btnNum8 = new JButton("8");
btnNum8.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum8.addActionListener(insertNumber);
panel.add(btnNum8);
//数字9
btnNum9 = new JButton("9");
btnNum9.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum9.addActionListener(insertNumber);
panel.add(btnNum9);
//取消按钮
btnCancel = new JButton("取消");
btnCancel.setForeground(Color.RED);
btnCancel.setFont(new Font("宋体", Font.BOLD, 40));
btnCancel.addActionListener(cancelCommand);
panel.add(btnCancel);
//数字4
btnNum4 = new JButton("4");
btnNum4.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum4.addActionListener(insertNumber);
panel.add(btnNum4);
//数字5
btnNum5 = new JButton("5");
btnNum5.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum5.addActionListener(insertNumber);
panel.add(btnNum5);
//数字6
btnNum6 = new JButton("6");
btnNum6.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum6.addActionListener(insertNumber);
panel.add(btnNum6);
//重置按钮
btnReset = new JButton("重置");
btnReset.setForeground(Color.BLUE);
btnReset.setFont(new Font("宋体", Font.BOLD, 40));
btnReset.addActionListener(resetCommand);
panel.add(btnReset);
//数字1
btnNum1 = new JButton("1");
btnNum1.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum1.addActionListener(insertNumber);
panel.add(btnNum1);
//数字2
btnNum2 = new JButton("2");
btnNum2.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum2.addActionListener(insertNumber);
panel.add(btnNum2);
//数字3
btnNum3 = new JButton("3");
btnNum3.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum3.addActionListener(insertNumber);
panel.add(btnNum3);
//空按钮
panel.add(new JButton(""));
//小数点（摆设）
btnDot = new JButton(".");
btnDot.setFont(new Font("Andalus", Font.BOLD, 60));
panel.add(btnDot);
//数字0
btnNum0 = new JButton("0");
btnNum0.setFont(new Font("Andalus", Font.BOLD, 60));
btnNum0.addActionListener(insertNumber);
panel.add(btnNum0);
//数字00（摆设）
btnNum00 = new JButton("00");
btnNum00.setFont(new Font("Andalus", Font.BOLD, 60));
panel.add(btnNum00);
//确定按钮
btnOK = new JButton("确定");
btnOK.setForeground(Color.GREEN);
btnOK.setFont(new Font("宋体", Font.BOLD, 40));
btnOK.addActionListener(okCommand);
panel.add(btnOK);
add(panel, BorderLayout.CENTER);
}
//按下数字按钮触发的事件
private class InsertNumberAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
psdDisplay.setText(String.valueOf(psdDisplay.getPassword()) +
event.getActionCommand());
}
}
//按下确定按钮触发的事件
private class OkCommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
char[] inputPassword = psdDisplay.getPassword();
boolean isMatch = true;
//密码长度需要相同
if (inputPassword.length != correctPassword.length)
{
isMatch = false;
}
//密码长度相同的情况下各位要一致
if (isMatch)
{
isMatch = Arrays.equals(inputPassword, correctPassword);
}
if (isMatch)
{
JOptionPane.showMessageDialog(null, "密码正确！", "提示信息",
JOptionPane.INFORMATION_MESSAGE);
}
else
{
JOptionPane.showMessageDialog(null, "密码错误", "错误信息",
JOptionPane.ERROR_MESSAGE);
psdDisplay.setText("");
}
}
}
//按下取消按钮触发的事件
private class CancelCommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
JOptionPane.showMessageDialog(null, "即将退出程序", "提示信息",
JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}
//按下重置按钮触发的事件
private class ResetCommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
psdDisplay.setText("");
}
}
}
END
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原文地址：http://my.oschina.net/Tsybius2014/blog/378868
