防止用户在SWT中输入文本字段中的字符

Text text = new Text(parent, SWT.BORDER);
text.addVerifyListener(new VerifyListener() {
    public void verifyText(VerifyEvent event) {
        // 此处可以根据需要自定义限制条件
        Pattern pattern = Pattern.compile("[0-9]*");
        Matcher matcher = pattern.matcher(event.text);
        event.doit = matcher.matches();
    }
});

Text text = new Text(parent, SWT.BORDER);
text.addKeyListener(new KeyAdapter() {
    public void keyPressed(KeyEvent event) {
        // 此处可以根据需要自定义过滤条件
        if (!Character.isDigit(event.character)) {
            event.doit = false;
        }
    }
});

Text text = new Text(parent, SWT.BORDER);
text.addModifyListener(new ModifyListener() {
    public void modifyText(ModifyEvent event) {
        // 此处可以根据需要自定义验证条件
        String input = text.getText();
        if (!input.matches("[0-9]*")) {
            MessageBox messageBox = new MessageBox(shell, SWT.ICON_WARNING);
            messageBox.setMessage("只允许输入数字！");
            messageBox.open();
        }
    }
});