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3 ways to reverse array in Java

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3 ways to reverse array in Java

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  1. import java.util.Arrays;
  2. public class Practive{
  3. 	public static void main (String[] args)
  4. 	{
  5. 		int [] array = new int[] {23,45,34,54,67,78};
  6. 		System.out.println("Original array:");
  7. 		System.out.println(Arrays.toString(array));
  8. 		//reverse method 1:
  9. 		int i =0;
  10. 		while ( i< (array.length)/2){		
  11. 			for (int j = array.length-1; j>i;j--){
  12. 				int tempf = array[i];
  13. 				int tempb = array[j];
  14. 				array[i] = tempb;
  15. 				array[j]= tempf;
  16. 				i++;
  17. 				System.out.println("Reverse array");
  18. 				System.out.println(Arrays.toString(array));	
  19. 			}
  20.  
  21.  
  22. 		}
  23.  
  24.  
  25.  
  26. 	}
  27.  
  28. }
  29.  
  30.  
  31. /*
  32. 	//reverse method 2:
  33. import java.util.Arrays;
  34. public class Practive{
  35. public static void main (String[] args)
  36. {
  37. 	int [] array = new int[] {23,45,34,54,67,78};
  38. 	System.out.println("Original array:");
  39. 	System.out.println(Arrays.toString(array));
  40. 	//reverse
  41. 	for (int i =0; i< (array.length)/2; i++){		
  42. 		for (int j = array.length-1; j>i;j--){
  43. 			int tempf = array[i];
  44. 			int tempb = array[j];
  45. 			array[i] = tempb;
  46. 			array[j]= tempf;
  47. 			i++;
  48. 			System.out.println("Reverse array");
  49. 			System.out.println(Arrays.toString(array));	
  50. 		}
  51.  
  52.  
  53. 	}
  54.  
  55. }
  56.  
  57. }
  58.  
  59. */
  60.  
  61.  
  62. /* 
  63. import java.util.Arrays;
  64. public class Practive{
  65. public static void main (String[] args)
  66. {
  67. 	int [] array = new int[] {23,45,34,54,67,78};
  68. 	System.out.println("Original array:");
  69. 	System.out.println(Arrays.toString(array));
  70. 	//reverse method 3
  71. 	for (int i =0; i< (array.length)/2; i++){	
  72. 		int temp = array[i];
  73. 		array[i] = array[array.length -1 -i];
  74. 		array[array.length-1-i]= temp;
  75. 		System.out.println("Reverse array");
  76. 		System.out.println(Arrays.toString(array));	
  77. 		}
  78.  
  79.  
  80. 	}
  81.  
  82. }
  83. */

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