Learn Java In a Easy Way

5)      Given integer array

      input :int[] arr={2,3,5,4,1,6,7,7,9};

Remove the duplicate elements and print sum of even numbers in the array..

print -1 if arr contains only odd numbers

package Set2;

import java.util.*;

public class ClassSET5 {

public static void main(String[] args) {

      int a[]={2,3,5,4,1,6,7,7,9};

      System.out.println(sumOfEvenNos(a));

}

public static int sumOfEvenNos(int[] a) {

      List<Integer> l1=new ArrayList<Integer>();

      for(int i=0;i<a.length;i++)

            l1.add(a[i]);

      List<Integer> l2=new ArrayList<Integer>();

      for(int i=0;i<a.length;i++)

      for(int j=i+1;j<a.length;j++)

            if(a[i]==a[j])

                  l2.add(a[j]);

      l1.removeAll(l2);

      l1.addAll(l2);

      int n=0,n1;

      for(int i=0;i<l1.size();i++)

            if(l1.get(i)%2==0)

                  n+=l1.get(i);

      if(n==0)

            n1=-1;

      else

            n1=n;

      return n1;

}

}