ilyon

用windows  的命令class MyPing extends Thread{ private User user=null; public void run() {   Process process;   boolean status=false; try { process = Runtime.getRuntime().exec("ping "+user

rollOver与mouseOver同样在鼠标移到目标上时触发事件，细微区别在于，mouseOver的bubbles等于true,而rollOver的bubbles是false. 所以当监听MouseEvent.ROLL_OVER事件后，鼠标移动到panel的几个按钮时，程序仍然认为鼠标悬停在panel上方。假设我们监听MouseEvent.MOUSE_OVER, 随着鼠标移到panel的按钮上，