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  1. import java.util.Arrays;
  2. /**
  3.  * Intersection and Union of Arrays
  4.  * @author Prateek
  5.  */
  6. class IntersectionAndUnion {
  7.  
  8. 	private int[] arr1;
  9. 	private int[] arr2;
  10.  
  11. 	public IntersectionAndUnion(int[] arr1, int[] arr2) {
  12. 		this.arr1 =arr1;
  13. 		this.arr2 =arr2;
  14. 		Arrays.sort(arr1);
  15. 		Arrays.sort(arr2);
  16. 	}
  17.  
  18. 	public static void main(String[] args) {
  19. 		int[] arr1={7, 5, 4, 3, 1};
  20. 		int[] arr2= {2, 3, 5, 6};
  21.  
  22. 		IntersectionAndUnion obj=new IntersectionAndUnion(arr1 , arr2);
  23.  
  24. 		System.out.println("Union List: ");
  25. 		obj.union();
  26.  
  27. 		System.out.println("Intersection List: ");
  28. 		obj.intersection();
  29. 	}
  30.  
  31. 	/**
  32. 	 * Union Of arrays
  33. 	 */
  34. 	public void union()	{
  35. 		int i=0,j=0;
  36. 		while(i < arr1.length && j < arr2.length)
  37. 		{
  38. 			if(arr1[i] < arr2[j])
  39. 				System.out.print(arr1[i++]);
  40. 			else if(arr1[i] > arr2[j])
  41. 				System.out.print(arr2[j++]);
  42. 			else{
  43. 				System.out.print(arr1[i++]);
  44. 				j++;
  45. 			}
  46. 			System.out.print("\t");
  47. 		}
  48.  
  49. 		if(arr2.length > arr1.length)
  50. 			for(;j<arr2.length;System.out.println(arr2[j]),j++);
  51. 		else if(arr2.length < arr1.length)
  52. 			for( ; i<arr1.length;System.out.println(arr1[i]),i++);
  53. 	}
  54.  
  55. 	/**
  56. 	 * Intersection of Arrays
  57. 	 */
  58. 	public void intersection()	{
  59. 		int i=0;
  60. 		int j=0;
  61. 		while(i < arr1.length && j < arr2.length)
  62. 		{
  63. 			if(arr1[i] < arr2[j])
  64. 				i++;
  65. 			else if(arr1[i] > arr2[j])
  66. 				j++;
  67. 			else
  68. 			{
  69. 				System.out.print(arr1[i++] + "\t");
  70. 				j++;
  71. 			}
  72. 		}
  73. 	}
  74. }
  75.  
Success #stdin #stdout 0.07s 381248KB
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Standard input is empty
stdout
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Union List: 
1	2	3	4	5	6	7
Intersection List: 
3	5
https://ideone.com/caQjce
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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