Question

java 如何设置jTextField文本框只能输入数字？

Answer 1

加上以下KeyListener监听事件就可以了。
public class VoteElectKeyListener implements KeyListener {

@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
int keyChar=e.getKeyChar();
if (keyChar>=KeyEvent.VK_0 && keyChar<=KeyEvent.VK_9) {

} else {
e.consume();
}
}

@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub

}

@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}

}

Answer 2

文本框添加事件监听，如果输入的字符不是数字字符，则不显示