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applet 代码2
时间:2008-01-12 编辑:简简单单 来源:一聚教程网
import java.awt.event.*;
public class TextFieldWithLimit extends TextField
implements KeyListener {
private int maxLength;
public TextFieldWithLimit
(String initialStr,int col,int maxLength) {
super(initialStr,col);
this.maxLength = maxLength;
addKeyListener(this);
}
public TextFieldWithLimit (int col,int maxLength) {
this("",col,maxLength);
}
public void keyTyped(KeyEvent e) {
char c = e.getKeyChar();
int len = getText().length();
if (len < maxLength) {
return;
}
else {
if((c==KeyEvent.VK_BACK_SPACE)||
(c==KeyEvent.VK_DELETE) ||
(c==KeyEvent.VK_ENTER)||
(c==KeyEvent.VK_TAB)||
e.isActionKey())
return;
else {
e.consume();
}
}
}
public void keyPressed(KeyEvent e) { }
public void keyReleased(KeyEvent e) { }
}
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