JAVA程序设计，使用GUI界面

效脊哗果图

参考代码

import java.awt.*

import 掘悄java.awt.event.*

import javax.swing.*

public class KeyFrame extends JFrame implements KeyListener{

JLabel jlkey

public KeyFrame() {

jlkey = new JLabel("请输入字母或者数字，其他字符不显示")

add(jlkey)

addKeyListener(this)

setLayout(new FlowLayout())

setSize(260, 160)

setTitle("输入...")

setLocationRelativeTo(null)

setDefaultCloseOperation(EXIT_ON_CLOSE)

setVisible(true)

}

public static void main(String[] args) {

new KeyFrame()

}

public void keyTyped(KeyEvent e) {//敲击键盘

c=e.getKeyChar()//得到键入的字符

repaint()//重绘

}

public void keyPressed(KeyEvent e) {//按下键盘

// c=e.getKeyChar()

// repaint()

}

public void keyReleased(KeyEvent e) {//释放键盘

}

char c 

@Override

public void paint(Graphics g) {

super.paint(g)

//如果只能显示输入樱散行的是字母或者数字，那么需要if判断下

if((c<='Z'&& c>='A')||(c<='z'&&c>='a')||(c<='9'&&c>='0')){// 注意比较的是字符 '9' 和字符'0'

Font font = g.getFont()

g.setColor(Color.BLUE)

g.setFont(new Font(font.getName(),font.getStyle(),20))

g.drawString(c+"",100, 100) //绘制

}

}

}

你好旦册滑，无意间看到模腊了，代码如下：

public class AppletTEST extends Applet{

TextField tfa,tfb

public void init(){

tfa=new TextField(20)

tfb=new TextField(20)

tfa.setText("21:33:35"姿皮)

Button b1 =new Button("系统时间")

this.add(tfa)

this.add(b1)

this.add(tfb)

b1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

tfb.setText("21:33:29")

}

})

}

public static void main(String[] args) {

new AppletTEST()

}

}

import javax.swing.*

import javax.swing.text.*

import java.awt.*

import java.awt.event.*

/**

* @author Hardneedl

*/

final class ButtonDemo extends JFrame {

public String getTitle() {return "ButtonDemo"}

static private final Dimension size = new Dimension(600,400)

public Dimension getPreferredSize() {return size}

public Dimension getMaximumSize() {return size}

public Dimension getMinimumSize() {return size}

public Dimension getSize(){return size}

private class ButtonAction extends AbstractAction{

private JTextComponent t

private String n

private ButtonAction(String name,JTextComponent t) {

super(name)

n=name

this.t=t

}

public void actionPerformed(ActionEvent e) {

t.setText(n)

}

}

private JButton b0,b1

private JTextField t

ButtonDemo() throws HeadlessException {

init()

attachListeners()

doLay()

}

private void init(){

t=new JTextField(20)

b0=new JButton(new ButtonAction("YES",t))

b1=new JButton(new ButtonAction("NO",t))

}

private void attachListeners(){

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

}

private void doLay(){

Container container = getContentPane()

JPanel p = new JPanel()

p.add(b0)

p.add(b1)

container.add(p,BorderLayout.NORTH)

container.add(t,BorderLayout.SOUTH)

pack()

setVisible(true)

}

public static void main(String...args) {

System.setProperty("swing.defaultlaf","com.sun.java.swing.plaf.windows.WindowsLookAndFeel")

SwingUtilities.invokeLater(

new Runnable(){

public void run() {

new ButtonDemo()

}

}

)

}

}

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