Runtime和process

public class test2 {

	public static void main(String[] args) {

		Runtime run = Runtime.getRuntime();// 通过Runtime类的静态方法为其进行实例化操作

		System.out.println("JVM空闲：" + run.freeMemory());

		System.out.println("JVM最大内存" + run.maxMemory());



		String str = "hello" + "word" + "!!!" + "\t" + "Welcone" + "to"

				+ "china" + "~";

		for (int i = 0; i < 100; i++) {

			str += i;

		}

		System.out.println("操作之后de jVM内存：" + run.freeMemory());

		run.gc();// 进行垃圾收集，释放空间

		System.out.println("垃圾回收后JVM内存量：" + run.freeMemory());



		Process pro = null;// 声明一个对象接受启动的进程



		try {

			pro = run.exec("notepad.exe");

		} catch (Exception e) {

			// TODO: handle exception

		}

		try {

			Thread.sleep(5000);

		} catch (Exception e) {

			// TODO: handle exception

		}

		pro.destroy();// 结束此进程



	}

}

　　结果：

记事本运行五秒后自动关闭