Finding Common Elements Of Two Arrays using java

Hi  Guys,

for example array1=[1,2,3,4,5,6] ,array2=[4,5,6] then  your program need to give output as [4,5,6].

Solution:

Here am giving two solutions one by using an iteration method ,other one is using collections.

solution1:
----------------------------------

package logics;

public class comonBetweenTwoArrays {
    public static void main(String []a)
    {
        int first[]=new int[]{1,2,3,4,5,6,7};
        int second[]=new int[]{4,5,6,7,8,9,0};
        for(int i=0;i<first.length;i++)
        {
            for(int j=0;j<second.length;j++){
                if(first[i]==second[j])
                {
                    System.out.print(first[i]);
                }
            }
        }
    }

}
output:
----------------------
4567



solution2:
--------------------------------------

package logics;
import java.util.*;
public class commonnInArraysUsingHastSet {
    public static void main(String []a)
    {
        Set<Integer > s=new HashSet<Integer>();
        Set<Integer> common=new HashSet<Integer>();
       
        int first[]=new int[]{1,2,3,4,5,6,7,8,9,10};
        int second[]=new int[]{0,4,5,6,7,8,9};
        for(int index:first)
        {
            s.add(index);
        }
        for(int c:second)
        {
            if(s.contains(c))
            {
                common.add(c);
            }
                           
        }
        //printing common values
        Iterator<Integer> i=common.iterator();
        while(i.hasNext())
        {
            System.out.print(i.next());
        }
       
    }
}
output:
-------------------
456789