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  1.  
  2. import java.util.*;
  3. import java.lang.*;
  4. import java.io.*;
  5.  
  6. class Main {
  7. 	public static void main (String[] args)  {
  8.  
  9. 		String a = "";
  10. 		long b = System.currentTimeMillis(); 
  11. 		for(int i = 0; i < 50000; i++) {
  12. 			a += 'a';
  13. 		}
  14. 		System.out.println("String tardo: " + (System.currentTimeMillis() - b) + " Milisegundos añadiendo 50.000 caracteres");
  15. 		StringBuilder st = new StringBuilder();
  16. 		b = System.currentTimeMillis(); 
  17. 		for(int i = 0; i < 50000; i++) {
  18. 			st.append('a');
  19. 		}
  20. 		System.out.println("StringBuilder tardo: " + (System.currentTimeMillis() - b) + " Milisegundos añadiendo 50.000 caracteres");
  21.  
  22. 		st = new StringBuilder();
  23. 		for(int i = 0; i < 1000000; i++) {
  24. 			st.append('a');
  25. 		}
  26. 		System.out.println("StringBuilder tardo: " + (System.currentTimeMillis() - b) + " Milisegundos añadiendo 1.000.000 caracteres");
  27. 	}
  28. }
Success #stdin #stdout 5.61s 320576KB
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stdin
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Standard input is empty
stdout
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String tardo: 5583 Milisegundos añadiendo 50.000 caracteres
StringBuilder tardo: 1 Milisegundos añadiendo 50.000 caracteres
StringBuilder tardo: 10 Milisegundos añadiendo 1.000.000 caracteres
https://ideone.com/Z2dLE1
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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