按下键盘上的箭头怎么对应程序里的箭头? 书上有个小项目 说是在一定时间输入一定数量的字符串 ...我想把输入的字符串改成箭头↑ ↓ ← → 但是我在键盘上按下这些键时 怎么判断我输入的是什么 . 该怎么实现 ? 这个 只是我看书上的例子后有这个想法. 不知道怎么做了 .. 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 这里给你贴一个具体的实例,但是还有点小问题就是 左箭头的具体实现要再用程序控制光标import javax.swing.*;import java.awt.event.KeyListener;import java.awt.event.KeyEvent;public class KeyListenerFrame extends JFrame implements KeyListener { private JTextArea jta=new JTextArea(10,10); public KeyListenerFrame(String title){ super(title); jta.addKeyListener(this); this.getContentPane().add(jta); this.pack(); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setLocationRelativeTo(null); } public static void main(String[] args) { new KeyListenerFrame("demo"); } @Override public void keyTyped(KeyEvent e) { //To change body of implemented methods use File | Settings | File Templates.// if(e.getKeyCode()==KeyEvent.VK_DOWN){// jta.append("↓");// } } @Override public void keyPressed(KeyEvent e) { switch(e.getKeyCode()){ case KeyEvent.VK_DOWN: jta.append("↓"); break; case KeyEvent.VK_UP: jta.append("↑"); break; case KeyEvent.VK_LEFT: jta.append("←"); break; case KeyEvent.VK_RIGHT: jta.append("→"); break;// default:// jta.append(""+e.getKeyChar()); } } @Override public void keyReleased(KeyEvent e) { //To change body of implemented methods use File | Settings | File Templates. }} 这里给你贴一个具体的实例,但是还有点小问题就是 左箭头的具体实现要再用程序控制光标import javax.swing.*;import java.awt.event.KeyListener;import java.awt.event.KeyEvent;public class KeyListenerFrame extends JFrame implements KeyListener { private JTextArea jta=new JTextArea(10,10); public KeyListenerFrame(String title){ super(title); jta.addKeyListener(this); this.getContentPane().add(jta); this.pack(); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setLocationRelativeTo(null); } public static void main(String[] args) { new KeyListenerFrame("demo"); } @Override public void keyTyped(KeyEvent e) { //To change body of implemented methods use File | Settings | File Templates.// if(e.getKeyCode()==KeyEvent.VK_DOWN){// jta.append("↓");// } } @Override public void keyPressed(KeyEvent e) { switch(e.getKeyCode()){ case KeyEvent.VK_DOWN: jta.append("↓"); break; case KeyEvent.VK_UP: jta.append("↑"); break; case KeyEvent.VK_LEFT: jta.append("←"); break; case KeyEvent.VK_RIGHT: jta.append("→"); break;// default:// jta.append(""+e.getKeyChar()); } } @Override public void keyReleased(KeyEvent e) { //To change body of implemented methods use File | Settings | File Templates. }} 求一正则表达式 Socket程序中的while循环问题 急啊,帮帮忙,大家 十分急! 紧急求助,我想先运行5个线程,直到它们结束再运行另外五个线程,怎么实现呢?谢谢啊 送分的问题!大家积极参加 客户端调用RMI接口,包出异常,不明原因,请各位高手看看?急!!!!!!!!! java连接ORACLE数据问题 请教jdbc连接sql server2000问题 请问怎样删除文件夹? 一般什么情况下使用Object作为形参接收其他类呢? 用for循环new出新的对象在内存中是怎么工作的
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;public class KeyListenerFrame extends JFrame implements KeyListener {
private JTextArea jta=new JTextArea(10,10); public KeyListenerFrame(String title){
super(title); jta.addKeyListener(this);
this.getContentPane().add(jta);
this.pack();
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
} public static void main(String[] args) {
new KeyListenerFrame("demo");
} @Override
public void keyTyped(KeyEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
// if(e.getKeyCode()==KeyEvent.VK_DOWN){
// jta.append("↓");
// } } @Override
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()){
case KeyEvent.VK_DOWN:
jta.append("↓");
break;
case KeyEvent.VK_UP:
jta.append("↑");
break;
case KeyEvent.VK_LEFT:
jta.append("←");
break;
case KeyEvent.VK_RIGHT:
jta.append("→");
break;
// default:
// jta.append(""+e.getKeyChar());
}
} @Override
public void keyReleased(KeyEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
}
}
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;public class KeyListenerFrame extends JFrame implements KeyListener {
private JTextArea jta=new JTextArea(10,10); public KeyListenerFrame(String title){
super(title); jta.addKeyListener(this);
this.getContentPane().add(jta);
this.pack();
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
} public static void main(String[] args) {
new KeyListenerFrame("demo");
} @Override
public void keyTyped(KeyEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
// if(e.getKeyCode()==KeyEvent.VK_DOWN){
// jta.append("↓");
// } } @Override
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()){
case KeyEvent.VK_DOWN:
jta.append("↓");
break;
case KeyEvent.VK_UP:
jta.append("↑");
break;
case KeyEvent.VK_LEFT:
jta.append("←");
break;
case KeyEvent.VK_RIGHT:
jta.append("→");
break;
// default:
// jta.append(""+e.getKeyChar());
}
} @Override
public void keyReleased(KeyEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
}
}