How to Display Duplicate elements from more than one List in java?

How to Display Duplicate elements from more than one List in java?

How to Display Duplicate elements from more than one List in java?

//I mean common elements from two List?

Ex: List a1=new ArrayList(); a1.add(50); a1.add(10); a1.add(20); a1.add(30); List a2=new ArrayList(); a2.add(50); a2.add(10); a2.add(20); a2.add(25); a2.add(40);

  from above code How to Display  common elements Display
View Answers

August 27, 2012 at 12:16 PM

Hare is an example that compare two array lists and display the common elements from both of them.

import java.util.*;

public class DisplayCommonElement{
  public static void main(String[]args){
    ArrayList a1 = new ArrayList();
    ArrayList a2 = new ArrayList();
     a1.add("a");
     a1.add("b");
     a1.add("c");

    a2.add("a");
    a2.add("b");
    a2.add("c"); 
    a2.add("d");
    a2.add("e");
        int array1Size = a1.size();
        int array2Size = a2.size();
        if (a1.size() > a2.size()) {
            int k = 0;
            for (int i = 0; i < a2.size(); i++)            {
                if (((String)a1.get(i)).equals((String)a2.get(i)))  {
                    System.out.println((String)a2.get(i));
                }
                k = i;
            }
           }
        else {
           int k = 0;
            for (int i = 0; i < a1.size(); i++) {
                if (((String)a1.get(i)).equals((String)a2.get(i))) {
                    System.out.println((String)a1.get(i));
                }
                k = i;
            }
         }
  }
}









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