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  1. public class Main {
  2.  
  3. 	public static void main(String[] args) {
  4. 		int n = 10000;
  5.  
  6. 		startTimer();
  7. 		String s1 = repeatString1("hoge", n);
  8. 		printTime();
  9.  
  10. 		startTimer();
  11. 		String s2 = repeatString2("hoge", n);
  12. 		printTime();
  13.  
  14. 		System.out.println(s1.equals(s2));
  15. 	}
  16.  
  17. 	public static String repeatString1(String s,int n) {
  18. 		String ret = "";
  19. 		for(int i=0;i<n;i++) {
  20. 			ret += s;
  21. 		}
  22. 		return ret;
  23. 	}
  24.  
  25. 	public static String repeatString2(String s,int n) {
  26. 		StringBuilder sb = new StringBuilder();
  27. 		for(int i=0;i<n;i++) {
  28. 			sb.append(s);
  29. 		}
  30. 		return sb.toString();
  31. 	}
  32.  
  33. 	private static long stime;
  34. 	private static void startTimer() {
  35. 		stime = System.nanoTime();
  36. 	}
  37. 	private static void printTime() {
  38. 		System.out.println((System.nanoTime() - stime) / 1000 + " us");
  39. 	}
  40. }
  41.  
Success #stdin #stdout 1.09s 320576KB
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Standard input is empty
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969594 us
898 us
true
https://ideone.com/z0F775
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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