- import java.awt.*;
- 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 keyPressed(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 keyReleased(KeyEvent e) { }
- public void keyTyped(KeyEvent e) { }
- }
- //该片段来自于http://www.codesnippet.cn/detail/090920135753.html
来源: http://www.codesnippet.cn/detail/090920135753.html