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Java Sort int Array Example

  1. /*
  2.    Java Sort int Array Example
  3.    This example shows how to sort an int array using sort method of Arrays class of
  4.    java.util package.
  5. */
  6.  
  7. import java.util.Arrays;
  8.  
  9. public class SortIntArrayExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create an int array
  14.     int[] i1 = new int[]{3,2,5,4,1};
  15.    
  16.     //print original int array
  17.     System.out.print("Original Array : ");
  18.     for(int index=0; index < i1.length ; index++)
  19.       System.out.print("  "  + i1[index]);
  20.    
  21.     /*
  22.      To sort java int array use Arrays.sort() method of java.util package.
  23.      Sort method sorts int array in ascending order and based on quicksort
  24.      algorithm.
  25.      There are two static sort methods available in java.util.Arrays class
  26.      to sort an int array.
  27.     */
  28.    
  29.     //To sort full array use sort(int[] i) method.
  30.     Arrays.sort(i1);
  31.    
  32.     //print sorted int array
  33.     System.out.print("Sorted int array : ");
  34.     for(int index=0; index < i1.length ; index++)
  35.       System.out.print("  "  + i1[index]);
  36.      
  37.     /*
  38.       To sort partial int array use
  39.       sort(int[] i, int startIndex, int endIndex) method where startIndex is
  40.       inclusive and endIndex is exclusive
  41.     */
  42.    
  43.     int[] i2 = new int[]{5,2,3,1,4};
  44.     Arrays.sort(i2,1,4);
  45.    
  46.     //print sorted int array
  47.     System.out.print("Partially Sorted int array : ");
  48.     for(int index=0; index < i2.length ; index++)
  49.       System.out.print("  "  + i2[index]);
  50.  
  51.   }
  52. }
  53.  
  54. /*
  55. Output Would be
  56.  
  57. Original Array :     3  2  5  4  1
  58. Sorted int array :     1  2  3  4  5
  59. Partially Sorted int array :     5  1  2  3  4
  60. */