How do you compare 2 lists in java?

Answer 1

First we need to have two lists whcih we need to compare.

and try to incorporate it in below code :

import java.util.*;

public class ExampleTry {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

List al1=new ArrayList();

al1.add("a1");

al1.add("a2");

al1.add("a3");

List al2=new ArrayList();

al2.add("a1");

al2.add("a2");

al2.add("a3");

al2.add("a4");

al2.add("a5");

for(Object objList:al1){

if(al2.contains(objList)){

al2.remove(objList);

}

}

System.out.println("Value in list"+al2);

}

}

Output :

Value in list[a4, a5]

Answer 2

You must use the objects compareTo method to compare objects. The compareTo method determines which object would be greater, or if they are equal