In this post we see how to check if value exists in list in java . arraylist.contains() mehtod use for check java arraylist contains element or not . arraylist contains() Method returns true if this list contains the given element. means , returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).
Systax :
public boolean contains(Object o) {
}- Parameters:
o element whose presence in this list is to be teste - Returns Value :
true if this list contains the specified element
Java ArrayList contains() Method example
import java.util.ArrayList;
public class ContailsElement {
public static void main(String[] args) {
ArrayList<String> arr = new ArrayList<String>();
// add element in arraylist
arr.add("c");
arr.add("php");
arr.add("html");
arr.add("java");
// print arraylist
System.out.println("arrayList is = " + arr);
/*
* Returns true if this list contains the specified element
*/
System.out.println(arr.contains("php"));
System.out.println(arr.contains("more"));
}
}Output:
arrayList is = [c, php, html, java]
true
falseSo , Here we have learned How to check if an ArrayList contains a value in Java and This method also use for to check if an arraylist does not contain a value in java .