Hi friend,

Use contains(Object o) method of Interface List

public boolean contains(Object o)

Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e.


import java.util.*;

class ListExample
{
public static void main(String[] args)
{
List arList = new ArrayList();
arList.add("a");
arList.add("b");
arList.add("c");
arList.add("d");
if(arList.contains("b"))
{
System.out.println("Element is already exists.");
}

}
}



Thanks