How can I count the time it takes a function to complete in Java?
要知道 一個 function 需要執行多少個 ms, 用下面的程式就可以了，滿方便的。
long startTime = System.currentTimeMillis();
doReallyLongThing();
long endTime = System.currentTimeMillis();
System.out.println("That took " + (endTime - startTime) + " milliseconds");
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