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