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GuravaReddy
How to Display Duplicate elements from more than one List in java?
1 Answer(s)      a year and 8 months ago
Posted in : Java Interview Questions


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

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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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