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Java Examples - Find common elements from arrays
Problem Description
How to find common elements from arrays ?
Solution
Following example shows how to find common elements from two arrays and store them in an array.
import java.util.ArrayList; public class NewClass { public static void main(String[] args) { ArrayList objArray = new ArrayList(); ArrayList objArray2 = new ArrayList(); objArray2.add(0,"common1"); objArray2.add(1,"common2"); objArray2.add(2,"notcommon"); objArray2.add(3,"notcommon1"); objArray.add(0,"common1"); objArray.add(1,"common2"); objArray.add(2,"notcommon2"); System.out.println("Array elements of array1"+objArray); System.out.println("Array elements of array2"+objArray2); objArray.retainAll(objArray2); System.out.println("Array1 after retaining common elements of array2 & array1"+objArray); } }
Result
The above code sample will produce the following result.
Array elements of array1[common1, common2, notcommon2] Array elements of array2[common1, common2, notcommon, notcommon1] Array1 after retaining common elements of array2 & array1 [common1, common2]
Another sample example of Find common elements from arrays
public class HelloWorld { public static void main(String a[]) { int[] arr1 = {4,7,3,9,2}; int[] arr2 = {3,2,12,9,40,32,4}; for(int i = 0;i < arr1.length; i++) { for(int j = 0; j < arr2.length; j++) { if(arr1[i] == arr2[j]) { System.out.println(arr1[i]); } } } } }
The above code sample will produce the following result.
4 3 9 2
java_arrays.htm
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