Question

How to find the common elements in two ArrayLists in Java

Answer 1

import java.util.ArrayList;
   
public class MyClass {
    public static void main(String args[]) {
        ArrayList<String> al1 = new ArrayList<String>();
        al1.add("java");
        al1.add("c++");
        al1.add("c");
        al1.add("dart");
 
        ArrayList<String> al2 = new ArrayList<String>();
        al2.add("c#");
        al2.add("php");
        al2.add("c");
        al2.add("javascript");
        al2.add("nodejs");
        al2.add("c++");
        
        ArrayList<String> al_common = new ArrayList<String>(al1);
         
        al_common.retainAll(al2);
 
        System.out.println(al_common);
    }
}
   
   
   
   
   
/*
run:
   
[c++, c]
 
*/

 

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