public static void main(String[] args) {
    // TODO Auto-generated method stub
    String os = System.getProperty("os.name");  
    System.out.println("操作系统："+os);
    //为了方便判断，将字母全部改为小写
    os=os.toLowerCase();

    if(os.startsWith("win")){
        System.out.println("是windows");
    }else if(os.startsWith("linux")){
        System.out.println("是linux");
    }else{
        System.out.println("未知系统");
    }
}