java Runtime类

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package com.ylchou.testRuntime;

public class TestRuntime {

    public static void main(String[] args) {
        Runtime rt = Runtime.getRuntime();
        System.out.println("处理器数量："+rt.availableProcessors());
        System.out.println("空闲内存："+rt.freeMemory()/1024/1024 + "M");
        System.out.println("总内存："+rt.totalMemory()/1024/1024 + "M");
        System.out.println("最大可用内存："+rt.maxMemory()/1024/1024 + "M");

        try{
            rt.exec("notepad.exe");
//            rt.exec("notepad");//后缀.exe可有可无
//            rt.exec("mspaint");
//            rt.exec("C:\\Users\\Public\\Desktop\\有道词典.lnk");
//            rt.exec("services.msc");
//            rt.exec("cmd");
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            System.out.println("出现异常啦!");
        }
    }
}

/**
 *     处理器数量：2
 *    空闲内存：15M
 *    总内存：15M
 *    最大可用内存：247M
 *    出现异常啦!
 */