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  1. public class Main {
  2.     public static void main(String[] args) {
  3.         String s1 = null;
  4.         String s2 = null;
  5.  
  6.         // equal 1 (standard)
  7.         s1 = "1234567890123456789012345678901234567890";
  8.         s2 = "1234567890123456789012345678901234567890";
  9.         long start = System.currentTimeMillis();
  10.         for (long i = 0; i < 10000000000L; i += 1) {
  11.             boolean b = s1.equals(s2);
  12.         }
  13.         System.out.println("equal: " + (System.currentTimeMillis() - start) + " milis");
  14.  
  15.         // equal 2 (with length & hash check)
  16.         s1 = "1234567890123456789012345678901234567891";
  17.         s2 = "1234567890123456789012345678901234567891";
  18.         start = System.currentTimeMillis();
  19.         for (long i = 0; i < 10000000000L; i += 1) {
  20.             boolean b = s1.length() == s2.length() && s1.hashCode() == s2.hashCode()
  21.                     && s1.equals(s2);
  22.         }
  23.         System.out.println("equal: " + (System.currentTimeMillis() - start) + " milis");
  24.  
  25.         // equal 3 (with hash check)
  26.         s1 = "1234567890123456789012345678901234567892";
  27.         s2 = "1234567890123456789012345678901234567892";
  28.         start = System.currentTimeMillis();
  29.         for (long i = 0; i < 10000000000L; i += 1) {
  30.             boolean b = s1.hashCode() == s2.hashCode() && s1.equals(s2);
  31.         }
  32.         System.out.println("equal: " + (System.currentTimeMillis() - start) + " milis");
  33.  
  34.         // equal 4 (with length check)
  35.         s1 = "1234567890123456789012345678901234567893";
  36.         s2 = "1234567890123456789012345678901234567893";
  37.         start = System.currentTimeMillis();
  38.         for (long i = 0; i < 10000000000L; i += 1) {
  39.             boolean b = s1.length() == s2.length() && s1.equals(s2);
  40.         }
  41.         System.out.println("equal: " + (System.currentTimeMillis() - start) + " milis");
  42.         System.out.println();
  43.  
  44.         // different 1 (standard)
  45.         s1 = "1234567890123456789012345678901234567890";
  46.         s2 = "1234567890123456789012345678901234567891";
  47.         start = System.currentTimeMillis();
  48.         for (long i = 0; i < 10000000000L; i += 1) {
  49.             boolean b = s1.equals(s2);
  50.         }
  51.         System.out.println("different: " + (System.currentTimeMillis() - start) + " milis");
  52.  
  53.         // different 2 (with length & hash check)
  54.         s1 = "1234567890123456789012345678901234567891";
  55.         s2 = "1234567890123456789012345678901234567892";
  56.         start = System.currentTimeMillis();
  57.         for (long i = 0; i < 10000000000L; i += 1) {
  58.             boolean b = s1.length() == s2.length() && s1.hashCode() == s2.hashCode()
  59.                     && s1.equals(s2);
  60.         }
  61.         System.out.println("different: " + (System.currentTimeMillis() - start) + " milis");
  62.  
  63.         // different 3 (with hash check)
  64.         s1 = "1234567890123456789012345678901234567892";
  65.         s2 = "1234567890123456789012345678901234567893";
  66.         start = System.currentTimeMillis();
  67.         for (long i = 0; i < 10000000000L; i += 1) {
  68.             boolean b = s1.hashCode() == s2.hashCode() && s1.equals(s2);
  69.         }
  70.         System.out.println("different: " + (System.currentTimeMillis() - start) + " milis");
  71.  
  72.         // different 4 (with length check)
  73.         s1 = "1234567890123456789012345678901234567893";
  74.         s2 = "1234567890123456789012345678901234567894";
  75.         start = System.currentTimeMillis();
  76.         for (long i = 0; i < 10000000000L; i += 1) {
  77.             boolean b = s1.length() == s2.length() && s1.equals(s2);
  78.         }
  79.         System.out.println("different: " + (System.currentTimeMillis() - start) + " milis");
  80.         System.out.println();
  81.  
  82.         // different size 1 (standard)
  83.         s1 = "1234567890123456789012345678901234567890";
  84.         s2 = "12345678901234567890123456789012345678901";
  85.         start = System.currentTimeMillis();
  86.         for (long i = 0; i < 10000000000L; i += 1) {
  87.             boolean b = s1.equals(s2);
  88.         }
  89.         System.out.println("different size: " + (System.currentTimeMillis() - start) + " milis");
  90.  
  91.         // different size 2 (with length & hash check)
  92.         s1 = "1234567890123456789012345678901234567891";
  93.         s2 = "12345678901234567890123456789012345678912";
  94.         start = System.currentTimeMillis();
  95.         for (long i = 0; i < 10000000000L; i += 1) {
  96.             boolean b = s1.length() == s2.length() && s1.hashCode() == s2.hashCode()
  97.                     && s1.equals(s2);
  98.         }
  99.         System.out.println("different size: " + (System.currentTimeMillis() - start) + " milis");
  100.  
  101.         // different size 3 (with hash check)
  102.         s1 = "1234567890123456789012345678901234567892";
  103.         s2 = "12345678901234567890123456789012345678923";
  104.         start = System.currentTimeMillis();
  105.         for (long i = 0; i < 10000000000L; i += 1) {
  106.             boolean b = s1.hashCode() == s2.hashCode() && s1.equals(s2);
  107.         }
  108.         System.out.println("different size: " + (System.currentTimeMillis() - start) + " milis");
  109.  
  110.         // different size 4 (with length check)
  111.         s1 = "1234567890123456789012345678901234567893";
  112.         s2 = "12345678901234567890123456789012345678934";
  113.         start = System.currentTimeMillis();
  114.         for (long i = 0; i < 10000000000L; i += 1) {
  115.             boolean b = s1.length() == s2.length() && s1.equals(s2);
  116.         }
  117.         System.out.println("different size: " + (System.currentTimeMillis() - start) + " milis");
  118.     }
  119. }
  120.  
Time limit exceeded #stdin #stdout 5s 380736KB
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https://ideone.com/PriAgm
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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