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

Hi,

Let's see the List interface in Java.

In Java List is an Interface which is ordered and can be used to access the sequential data.

The List interface provides the methods to insert and remove the data from the collection.

In the list we can have the duplicate data.

List allows the developers to perform following operation on the list elements: a) add b) remove c) relace

You can use the List interface to perform the following operations on the Collection:

a) Positional access b) Search c) Iteration d) Range-view

Read more at List and Queue Interface tutorial.

Thanks