Home Tutorial Java Collections Arraylist Display Common Elements from two ArrayLists in Java

Display Common Elements from two ArrayLists in Java
Posted on: October 24, 2009 at 12:00 AM

In this section, we are going to compare two array lists and display the common elements from both of them.

Display Common Elements from two ArrayLists in Java

In this section, we are going to compare two array lists and display the common elements from both of them. To show the common elements from the two list, we have created two array lists a1 and a2 and add some elements to both of them. Then we have created a condition according to list sizes and display the common one.

Here is the code:

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;
            }
         }
  }
}

Output

a
b
c

Related Tags for Display Common Elements from two ArrayLists in Java:

«Previous Index Next»

Ask Questions?

If you are facing any programming issue, such as compilation errors or not able to find the code you are looking for.

Ask your questions, our development team will try to give answers to your questions.

Tutorial Topics