Java 代码运行时间统计

// 放在要检测的代码段前，取开始前的时间戳
        Long startTime = System.currentTimeMillis();
        // 放在要检测的代码段后，取结束后的时间戳
        Long endTime = System.currentTimeMillis();

// 计算并打印耗时
        Long tempTime = (endTime - startTime);
        System.out.println("花费时间："+
                (((tempTime/86400000)>0)?((tempTime/86400000)+"d"):"")+
                ((((tempTime/86400000)>0)||((tempTime%86400000/3600000)>0))?((tempTime%86400000/3600000)+"h"):(""))+
                ((((tempTime/3600000)>0)||((tempTime%3600000/60000)>0))?((tempTime%3600000/60000)+"m"):(""))+
                ((((tempTime/60000)>0)||((tempTime%60000/1000)>0))?((tempTime%60000/1000)+"s"):(""))+
                ((tempTime%1000)+"ms"));