在程序開發中經常會用到比較代碼執行效率問題,可以用System.currentTimeMillis()方法來記錄一下
long start,end;
start = System.currentTimeMillis();
end = System.currentTimeMillis();
System.out.println("start time:" + start+ "; end time:" + end+ "; Run Time:" + (end - start) + "(ms)");