Search an Element in an ArrayList in Java

Java ArrayList Examples

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• How to Create an ArrayList and Add Elements to It
• Create ArrayList from Another ArrayList in Java
• How to Access Elements of ArrayList in Java
• How to Remove Element from ArrayList in Java
• How to Iterate over ArrayList in Java
• Java ArrayList remove() Method Example
• Java ArrayList removeAll() Method Example
• Clear ArrayList in Java Example
• Java 8 forEach() List Example
• Add Enum Values to ArrayList Example
• Join List Strings with Commas in Java
• Java Stream filter null values example
• Java ArrayList subList() Example
• Get Index of Elements in ArrayList Example
• Java ArrayList removeIf() Example
• Java ArrayList add(), get() and set() Method Example
• Iterate over ArrayList Using forEach Java
• Iterate over ArrayList using Iterator in Java
• Java ArrayList indexOf() and lastIndexOf() Example
• Search an Element in an ArrayList in Java

Array Methods with Examples

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• Java ArrayList add() Method
• Java ArrayList addAll() Method
• Java ArrayList clear() Method
• Java ArrayList contains() Method
• Java ArrayList ensureCapacity() Method
• Java ArrayList clone() Method
• Java ArrayList get() Method
• Java ArrayList indexOf() Method
• Java ArrayList remove() Method
• Java ArrayList removeAll() Method
• Java ArrayList removeIf() Method
• Java ArrayList retainAll() Method
• Java ArrayList sort() Method
• Java ArrayList spliterator() Method

Java ArrayList class provides the following methods to search an element of ArrayList in Java:

• contains(Object o)
• indexOf(Object o)
• lastIndexOf(Object o)

Search an Element in an ArrayList in Java

package com.javaguides.collections.arraylistexamples;

import java.util.ArrayList;
import java.util.List;

public class SearchElementsInArrayListExample {
    public static void main(String[] args) {
        List < String > programmingLanguages = new ArrayList < > ();
        programmingLanguages.add("C");
        programmingLanguages.add("C++");
        programmingLanguages.add("Java");
        programmingLanguages.add("Kotlin");
        programmingLanguages.add("Python");
        programmingLanguages.add("Perl");
        programmingLanguages.add("Ruby");

        // Check if an ArrayList contains a given element
        System.out.println("Does names array contain \"Bob\"? : " + programmingLanguages.contains("C++"));

        // Find the index of the first occurrence of an element in an ArrayList
        System.out.println("indexOf \"Java\": " + programmingLanguages.indexOf("Java"));
        System.out.println("indexOf \"Python\": " + programmingLanguages.indexOf("Python"));

        // Find the index of the last occurrence of an element in an ArrayList
        System.out.println("lastIndexOf \"Perl\" : " + programmingLanguages.lastIndexOf("Perl"));
        System.out.println("lastIndexOf \"Ruby\" : " + programmingLanguages.lastIndexOf("Ruby"));
    }
}

Output

Does names array contain "Bob"? : true
indexOf "Java": 2
indexOf "Python": 4
lastIndexOf "Perl" : 5
lastIndexOf "Ruby" : 6

Reference

https://www.javaguides.net/2018/06/guide-to-arraylist-class.html