静

javaTextField.addFocusListener(new FocusListener() { public void focusLost(FocusEvent e) {  javaTextField.requestFocus(); //失去焦点执行的代码 }  public void focusGained(FocusEvent e) { //获得焦点执行的代码 } }; javaTextField.addKeyListener(new KeyAdapter() {

<br />boolean ipValid(String s){<br />     String regex0="(2[0-4]//d)" + "|(25[0-5])";<br />     String regex1="1//d{2}";<br />     String regex2="[1-9]//d";<br />     String regex3="//d";<br />     String regex="("+regex0+")|("+regex1+")|("+regex2+")