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 loopwhile(condition) { while(condition) { // statement of inside loop } // statement of outer loop} Nested Do-While loopdo{ 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 Loopsdo{ 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 LoopsExample 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); } } Output1 2 3 4 5 6 7 8 9 10 11 12Example 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); } } Output3 3 5 7 Comment More infoAdvertise with us Next Article Java Nested Loops with Examples C code_r Follow 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. 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