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 Main {
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]
