java Runtime类

public class Test {

	public static void main(String[] args) throws UnsupportedEncodingException
	{
		Runtime r = Runtime.getRuntime();//获取Runtime实例
		p(r.freeMemory());//剩余内存
		p(r.totalMemory()/1024/1024);//总内存
		p(r.maxMemory()/1024/1024);//最大可用内存
		p(r.availableProcessors());//核心数
		List list = new ArrayList();
		for(int i=0;i<100000;i++)
		{
			list.add("aaaaaaaaaaaaaaaaaaaabbbbbbbbbbb");
		}
		p(r.freeMemory());//剩余内存
		r.gc();//垃圾回收，  测试用   实际应用中不要显式调用！！
		p(r.freeMemory());//剩余内存
		String s = "";
		try {
			//执行命令不支持cd切换目录，可以把目录作为参数传进去
			Process proc = r.exec("cmd.exe /c dir", null, new File("c:"));
			//执行有回显的命令
			proc = r.exec("cmd.exe /c dir");
			//打开可执行文件
			r.exec("D:\\Program Files\\cradio_chs\\CRadio.exe");
			//执行脚本
			proc = r.exec("cmd.exe /c C:\\Users\\Administrator\\Desktop\\哨兵启动.cmd");
			//获取回显
			BufferedReader br = new BufferedReader(new InputStreamReader(proc.getInputStream(),"gbk"));
			while((s=br.readLine())!=null)
			{
				p(s);
			}
			//打开可执行文件
			r.exec("C:\\Program Files\\Microsoft Office\\Office16\\WINWORD.EXE C:\\Users\\Administrator\\Desktop\\违章push规则变更.doc");
			r.exec("C:\\Program Files\\Microsoft Office\\Office16\\WINWORD.EXE C:\\Users\\Administrator\\Desktop\\违章\" \"push规则.docx");//空格用 \" \"代替
			r.exec("notepad.exe");
			proc.waitFor();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static void p(Object o)
	{
		System.out.println(o);
	}
}