RunTime类，让程序自动打开，关闭程序

public class T1 {
	public static void main(String[] args) {

		Runtime runtime = Runtime.getRuntime();
		Process process=null;

		try {
			process= runtime.exec("notepad.exe");//执行记事本程序,返回一个进程对象
		} catch (IOException e) {
			e.printStackTrace();
		}
		try {
			Thread.sleep(3000);//3秒后关闭记事本
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		process.destroy();//关闭记事本
	}
}