Skip to content
geeksforgeeks
  • Courses
    • DSA to Development
    • Get IBM Certification
    • Newly Launched!
      • Master Django Framework
      • Become AWS Certified
    • For Working Professionals
      • Interview 101: DSA & System Design
      • Data Science Training Program
      • JAVA Backend Development (Live)
      • DevOps Engineering (LIVE)
      • Data Structures & Algorithms in Python
    • For Students
      • Placement Preparation Course
      • Data Science (Live)
      • Data Structure & Algorithm-Self Paced (C++/JAVA)
      • Master Competitive Programming (Live)
      • Full Stack Development with React & Node JS (Live)
    • Full Stack Development
    • Data Science Program
    • All Courses
  • Tutorials
    • Data Structures & Algorithms
    • ML & Data Science
    • Interview Corner
    • Programming Languages
    • Web Development
    • CS Subjects
    • DevOps And Linux
    • School Learning
  • Practice
    • GfG 160: Daily DSA
    • Problem of the Day
    • Practice Coding Problems
    • GfG SDE Sheet
  • Java Arrays
  • Java Strings
  • Java OOPs
  • Java Collection
  • Java 8 Tutorial
  • Java Multithreading
  • Java Exception Handling
  • Java Programs
  • Java Project
  • Java Collections Interview
  • Java Interview Questions
  • Java MCQs
  • Spring
  • Spring MVC
  • Spring Boot
  • Hibernate
Open In App
Next Article:
Java Nested Loops with Examples
Next article icon

Java Nested Loops with Examples

Last Updated : 11 Jan, 2024
Comments
Improve
Suggest changes
Like Article
Like
Report

A Nested loop means a loop statement inside another loop statement. That is why nested loops are also called "loop inside loop".

Nested For loop 

for ( initialization; condition; increment ) {
for ( initialization; condition; increment ) {
// statement of inside loop
}

// statement of outer loop
}

Nested While loop

while(condition) {
while(condition) {
// statement of inside loop
}

// statement of outer loop
}

Nested Do-While loop

do{
do{
// statement of inside loop
}
while(condition);

// statement of outer loop
}
while(condition);

Note: There is no rule that a loop must be nested inside its own type. In fact, there can be any type of loop nested inside any type and to any level.

Hybrid Java Nested Loops

do{
while(condition) {
for ( initialization; condition; increment ) {
// statement of inside for loop
}

// statement of inside while loop

}

// statement of outer do-while loop
}while(condition);

Below are some examples to demonstrate the use of Nested Loops:

Examples of Java Nested Loops

Example 1: Below program uses a nested for loop to print a 2D matrix. 

Java
// Java program to print the elements of
// a 2 D array or matrix
import java.io.*;

// Driver Class
class GFG {
    public static void print2D(int mat[][])
    {
        // Loop through all rows
        for (int i = 0; i < mat.length; i++) {

            // Loop through all elements of current row
            for (int j = 0; j < mat[i].length; j++)
                System.out.print(mat[i][j] + " ");

            System.out.println();
        }
    }
      
      // main function
    public static void main(String args[]) throws IOException
    {
        int mat[][] = { { 1, 2, 3, 4 },
                        { 5, 6, 7, 8 },
                        { 9, 10, 11, 12 } };
        print2D(mat);
    }
}

Output
1 2 3 4 
5 6 7 8 
9 10 11 12

Example 2: Below program uses a nested for loop to print all prime factors of a number. 

Java
// Java program to print all prime factors
import java.io.*;
import java.lang.Math;

// Driver Class
class GFG {
    // A function to print all prime factors
    // of a given number n
    public static void primeFactors(int n)
    {
        // Print the number of 2s that divide n
        while (n % 2 == 0) {
            System.out.print(2 + " ");
            n /= 2;
        }

        // n must be odd at this point. So we can
        // skip one element (Note i = i +2)
        for (int i = 3; i <= Math.sqrt(n); i += 2) {
            // While i divides n, print i and divide n
            while (n % i == 0) {
                System.out.print(i + " ");
                n /= i;
            }
        }

        // This condition is to handle the case when
        // n is a prime number greater than 2
        if (n > 2)
            System.out.print(n);
    }

      // main function
    public static void main(String[] args)
    {
        int n = 315;
        primeFactors(n);
    }
}

Output
3 3 5 7

Next Article
Java Nested Loops with Examples

C

code_r
Improve
Article Tags :
  • Java
  • loop
Practice Tags :
  • Java

Similar Reads

  • Java Tutorial
    Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. It is known for its Write Once, Run Anywhere capability, which means code written in Java can run on any device that supports the Java Virtual Machine (JVM).Java s
    10 min read
  • Java OOP(Object Oriented Programming) Concepts
    Java Object-Oriented Programming (OOPs) is a fundamental concept in Java that every developer must understand. It allows developers to structure code using classes and objects, making it more modular, reusable, and scalable.The core idea of OOPs is to bind data and the functions that operate on it,
    13 min read
  • Java Interview Questions and Answers
    Java is one of the most popular programming languages in the world, known for its versatility, portability, and wide range of applications. Java is the most used language in top companies such as Uber, Airbnb, Google, Netflix, Instagram, Spotify, Amazon, and many more because of its features and per
    15+ min read
  • Arrays in Java
    Arrays in Java are one of the most fundamental data structures that allow us to store multiple values of the same type in a single variable. They are useful for storing and managing collections of data. Arrays in Java are objects, which makes them work differently from arrays in C/C++ in terms of me
    15+ min read
  • Inheritance in Java
    Java Inheritance is a fundamental concept in OOP(Object-Oriented Programming). It is the mechanism in Java by which one class is allowed to inherit the features(fields and methods) of another class. In Java, Inheritance means creating new classes based on existing ones. A class that inherits from an
    13 min read
  • Collections in Java
    Any group of individual objects that are represented as a single unit is known as a Java Collection of Objects. In Java, a separate framework named the "Collection Framework" has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interfac
    15+ min read
  • Java Exception Handling
    Exception handling in Java allows developers to manage runtime errors effectively by using mechanisms like try-catch block, finally block, throwing Exceptions, Custom Exception handling, etc. An Exception is an unwanted or unexpected event that occurs during the execution of a program, i.e., at runt
    10 min read
  • Java Interface
    An Interface in Java programming language is defined as an abstract type used to specify the behaviour of a class. An interface in Java is a blueprint of a behaviour. A Java interface contains static constants and abstract methods. Key Properties of Interface:The interface in Java is a mechanism to
    12 min read
  • Java Programs - Java Programming Examples
    In this article, we will learn and prepare for Interviews using Java Programming Examples. From basic Java programs like the Fibonacci series, Prime numbers, Factorial numbers, and Palindrome numbers to advanced Java programs.Java is one of the most popular programming languages today because of its
    8 min read
  • Polymorphism in Java
    Polymorphism in Java is one of the core concepts in object-oriented programming (OOP) that allows objects to behave differently based on their specific class type. The word polymorphism means having many forms, and it comes from the Greek words poly (many) and morph (forms), this means one entity ca
    7 min read
geeksforgeeks-footer-logo
Corporate & Communications Address:
A-143, 7th Floor, Sovereign Corporate Tower, Sector- 136, Noida, Uttar Pradesh (201305)
Registered Address:
K 061, Tower K, Gulshan Vivante Apartment, Sector 137, Noida, Gautam Buddh Nagar, Uttar Pradesh, 201305
GFG App on Play Store GFG App on App Store
Advertise with us
  • Company
  • About Us
  • Legal
  • Privacy Policy
  • In Media
  • Contact Us
  • Advertise with us
  • GFG Corporate Solution
  • Placement Training Program
  • Languages
  • Python
  • Java
  • C++
  • PHP
  • GoLang
  • SQL
  • R Language
  • Android Tutorial
  • Tutorials Archive
  • DSA
  • Data Structures
  • Algorithms
  • DSA for Beginners
  • Basic DSA Problems
  • DSA Roadmap
  • Top 100 DSA Interview Problems
  • DSA Roadmap by Sandeep Jain
  • All Cheat Sheets
  • Data Science & ML
  • Data Science With Python
  • Data Science For Beginner
  • Machine Learning
  • ML Maths
  • Data Visualisation
  • Pandas
  • NumPy
  • NLP
  • Deep Learning
  • Web Technologies
  • HTML
  • CSS
  • JavaScript
  • TypeScript
  • ReactJS
  • NextJS
  • Bootstrap
  • Web Design
  • Python Tutorial
  • Python Programming Examples
  • Python Projects
  • Python Tkinter
  • Python Web Scraping
  • OpenCV Tutorial
  • Python Interview Question
  • Django
  • Computer Science
  • Operating Systems
  • Computer Network
  • Database Management System
  • Software Engineering
  • Digital Logic Design
  • Engineering Maths
  • Software Development
  • Software Testing
  • DevOps
  • Git
  • Linux
  • AWS
  • Docker
  • Kubernetes
  • Azure
  • GCP
  • DevOps Roadmap
  • System Design
  • High Level Design
  • Low Level Design
  • UML Diagrams
  • Interview Guide
  • Design Patterns
  • OOAD
  • System Design Bootcamp
  • Interview Questions
  • Inteview Preparation
  • Competitive Programming
  • Top DS or Algo for CP
  • Company-Wise Recruitment Process
  • Company-Wise Preparation
  • Aptitude Preparation
  • Puzzles
  • School Subjects
  • Mathematics
  • Physics
  • Chemistry
  • Biology
  • Social Science
  • English Grammar
  • Commerce
  • World GK
  • GeeksforGeeks Videos
  • DSA
  • Python
  • Java
  • C++
  • Web Development
  • Data Science
  • CS Subjects
@GeeksforGeeks, Sanchhaya Education Private Limited, All rights reserved
We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy
Lightbox
Improvement
Suggest Changes
Help us improve. Share your suggestions to enhance the article. Contribute your expertise and make a difference in the GeeksforGeeks portal.
geeksforgeeks-suggest-icon
Create Improvement
Enhance the article with your expertise. Contribute to the GeeksforGeeks community and help create better learning resources for all.
geeksforgeeks-improvement-icon
Suggest Changes
min 4 words, max Words Limit:1000

Thank You!

Your suggestions are valuable to us.

'); // $('.spinner-loading-overlay').show(); let script = document.createElement('script'); script.src = 'https://assets.geeksforgeeks.org/v2/editor-prod/static/js/bundle.min.js'; script.defer = true document.head.appendChild(script); script.onload = function() { suggestionModalEditor() //to add editor in suggestion modal if(loginData && loginData.premiumConsent){ personalNoteEditor() //to load editor in personal note } } script.onerror = function() { if($('.editorError').length){ $('.editorError').remove(); } var messageDiv = $('
').text('Editor not loaded due to some issues'); $('#suggestion-section-textarea').append(messageDiv); $('.suggest-bottom-btn').hide(); $('.suggestion-section').hide(); editorLoaded = false; } }); //suggestion modal editor function suggestionModalEditor(){ // editor params const params = { data: undefined, plugins: ["BOLD", "ITALIC", "UNDERLINE", "PREBLOCK"], } // loading editor try { suggestEditorInstance = new GFGEditorWrapper("suggestion-section-textarea", params, { appNode: true }) suggestEditorInstance._createEditor("") $('.spinner-loading-overlay:eq(0)').remove(); editorLoaded = true; } catch (error) { $('.spinner-loading-overlay:eq(0)').remove(); editorLoaded = false; } } //personal note editor function personalNoteEditor(){ // editor params const params = { data: undefined, plugins: ["UNDO", "REDO", "BOLD", "ITALIC", "NUMBERED_LIST", "BULLET_LIST", "TEXTALIGNMENTDROPDOWN"], placeholderText: "Description to be......", } // loading editor try { let notesEditorInstance = new GFGEditorWrapper("pn-editor", params, { appNode: true }) notesEditorInstance._createEditor(loginData&&loginData.user_personal_note?loginData.user_personal_note:"") $('.spinner-loading-overlay:eq(0)').remove(); editorLoaded = true; } catch (error) { $('.spinner-loading-overlay:eq(0)').remove(); editorLoaded = false; } } var lockedCasesHtml = `You can suggest the changes for now and it will be under 'My Suggestions' Tab on Write.

You will be notified via email once the article is available for improvement. Thank you for your valuable feedback!`; var badgesRequiredHtml = `It seems that you do not meet the eligibility criteria to create improvements for this article, as only users who have earned specific badges are permitted to do so.

However, you can still create improvements through the Pick for Improvement section.`; jQuery('.improve-header-sec-child').on('click', function(){ jQuery('.improve-modal--overlay').hide(); $('.improve-modal--suggestion').hide(); jQuery('#suggestion-modal-alert').hide(); }); $('.suggest-change_wrapper, .locked-status--impove-modal .improve-bottom-btn').on('click',function(){ // when suggest changes option is clicked $('.ContentEditable__root').text(""); $('.suggest-bottom-btn').html("Suggest changes"); $('.thank-you-message').css("display","none"); $('.improve-modal--improvement').hide(); $('.improve-modal--suggestion').show(); $('#suggestion-section-textarea').show(); jQuery('#suggestion-modal-alert').hide(); if(suggestEditorInstance !== null){ suggestEditorInstance.setEditorValue(""); } $('.suggestion-section').css('display', 'block'); jQuery('.suggest-bottom-btn').css("display","block"); }); $('.create-improvement_wrapper').on('click',function(){ // when create improvement option clicked then improvement reason will be shown if(loginData && loginData.isLoggedIn) { $('body').append('
'); $('.spinner-loading-overlay').show(); jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.unlocked-status--improve-modal-content').css("display","none"); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { showErrorMessage(e.responseJSON,e.status) }, }); } else { if(loginData && !loginData.isLoggedIn) { $('.improve-modal--overlay').hide(); if ($('.header-main__wrapper').find('.header-main__signup.login-modal-btn').length) { $('.header-main__wrapper').find('.header-main__signup.login-modal-btn').click(); } return; } } }); $('.left-arrow-icon_wrapper').on('click',function(){ if($('.improve-modal--suggestion').is(":visible")) $('.improve-modal--suggestion').hide(); else{ } $('.improve-modal--improvement').show(); }); const showErrorMessage = (result,statusCode) => { if(!result) return; $('.spinner-loading-overlay:eq(0)').remove(); if(statusCode == 403) { $('.improve-modal--improve-content.error-message').html(result.message); jQuery('.improve-modal--overlay').show(); jQuery('.improve-modal--improvement').show(); $('.locked-status--impove-modal').css("display","block"); $('.unlocked-status--improve-modal-content').css("display","none"); $('.improve-modal--improvement').attr("status","locked"); return; } } function suggestionCall() { var editorValue = suggestEditorInstance.getValue(); var suggest_val = $(".ContentEditable__root").find("[data-lexical-text='true']").map(function() { return $(this).text().trim(); }).get().join(' '); suggest_val = suggest_val.replace(/\s+/g, ' ').trim(); var array_String= suggest_val.split(" ") //array of words var gCaptchaToken = $("#g-recaptcha-response-suggestion-form").val(); var error_msg = false; if(suggest_val != "" && array_String.length >=4){ if(editorValue.length { jQuery('.ContentEditable__root').focus(); jQuery('#suggestion-modal-alert').hide(); }, 3000); } } document.querySelector('.suggest-bottom-btn').addEventListener('click', function(){ jQuery('body').append('
'); jQuery('.spinner-loading-overlay').show(); if(loginData && loginData.isLoggedIn) { suggestionCall(); return; } // script for grecaptcha loaded in loginmodal.html and call function to set the token setGoogleRecaptcha(); }); $('.improvement-bottom-btn.create-improvement-btn').click(function() { //create improvement button is clicked $('body').append('
'); $('.spinner-loading-overlay').show(); // send this option via create-improvement-post api jQuery.ajax({ url: writeApiUrl + 'create-improvement-post/?v=1', type: "POST", contentType: 'application/json; charset=utf-8', dataType: 'json', xhrFields: { withCredentials: true }, data: JSON.stringify({ gfg_id: post_id }), success:function(result) { $('.spinner-loading-overlay:eq(0)').remove(); $('.improve-modal--overlay').hide(); $('.create-improvement-redirection-to-write').attr('href',writeUrl + 'improve-post/' + `${result.id}` + '/', '_blank'); $('.create-improvement-redirection-to-write')[0].click(); }, error:function(e) { showErrorMessage(e.responseJSON,e.status); }, }); });
"For an ad-free experience and exclusive features, subscribe to our Premium Plan!"
Continue without supporting
`; $('body').append(adBlockerModal); $('body').addClass('body-for-ad-blocker'); const modal = document.getElementById("adBlockerModal"); modal.style.display = "block"; } function handleAdBlockerClick(type){ if(type == 'disabled'){ window.location.reload(); } else if(type == 'info'){ document.getElementById("ad-blocker-div").style.display = "none"; document.getElementById("ad-blocker-info-div").style.display = "flex"; handleAdBlockerIconClick(0); } } var lastSelected= null; //Mapping of name and video URL with the index. const adBlockerVideoMap = [ ['Ad Block Plus','https://media.geeksforgeeks.org/auth-dashboard-uploads/abp-blocker-min.mp4'], ['Ad Block','https://media.geeksforgeeks.org/auth-dashboard-uploads/Ad-block-min.mp4'], ['uBlock Origin','https://media.geeksforgeeks.org/auth-dashboard-uploads/ub-blocke-min.mp4'], ['uBlock','https://media.geeksforgeeks.org/auth-dashboard-uploads/U-blocker-min.mp4'], ] function handleAdBlockerIconClick(currSelected){ const videocontainer = document.getElementById('ad-blocker-info-div-gif'); const videosource = document.getElementById('ad-blocker-info-div-gif-src'); if(lastSelected != null){ document.getElementById("ad-blocker-info-div-icons-"+lastSelected).style.backgroundColor = "white"; document.getElementById("ad-blocker-info-div-icons-"+lastSelected).style.borderColor = "#D6D6D6"; } document.getElementById("ad-blocker-info-div-icons-"+currSelected).style.backgroundColor = "#D9D9D9"; document.getElementById("ad-blocker-info-div-icons-"+currSelected).style.borderColor = "#848484"; document.getElementById('ad-blocker-info-div-name-span').innerHTML = adBlockerVideoMap[currSelected][0] videocontainer.pause(); videosource.setAttribute('src', adBlockerVideoMap[currSelected][1]); videocontainer.load(); videocontainer.play(); lastSelected = currSelected; }

What kind of Experience do you want to share?

Interview Experiences
Admission Experiences
Career Journeys
Work Experiences
Campus Experiences
Competitive Exam Experiences