How to compare performance of string creation ?
Following example compares the performance of two strings created in two different ways.
public class StringComparePerformance{ public static void main(String[] args){ long startTime = System.currentTimeMillis(); for(int i=0;i<50000;i++){ String s1 = "hello"; String s2 = "hello"; } long endTime = System.currentTimeMillis(); System.out.println("Time taken for creation" + " of String literals : "+ (endTime - startTime) + " milli seconds" ); long startTime1 = System.currentTimeMillis(); for(int i=0;i<50000;i++){ String s3 = new String("hello"); String s4 = new String("hello"); } long endTime1 = System.currentTimeMillis(); System.out.println("Time taken for creation" + " of String objects : " + (endTime1 - startTime1) + " milli seconds"); } }
The above code sample will produce the following result.The result may vary.
Time taken for creation of String literals : 0 milli seconds Time taken for creation of String objects : 16 milli seconds
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