Java示例比较性能

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");

   }

}