Duplicate Number Between 1 to n in Java

Find out duplicate numbers between 1 to n numbers in java. Using this program we can find the duplicate number or repeated number in java. Two loops can be used to find duplicate components. The outer loop iterates across the array from 0 to the array’s length. The element will be chosen by the outer loop. The selected element will be compared to the rest of the array’s elements using the inner loop.

public class Main
public static void main(String[] args)
int [] arr = new int [] {10,34,56,67,10,56,3};
System.out.println("Duplicate elements are ");
for(int i = 0; i < arr.length; i++)
for(int j = i + 1; j < arr.length; j++)
if(arr[i] == arr[j])



Duplicate elements are

What is hash maps and how it find the duplicate element

The HashSet data structure is the most common approach to discover duplicate elements in an array. Set abstract data type does not allow duplicates, as you may recall. This attribute can be used to filter out duplicate elements.

We utilize HashMap to locate duplicates in an array in Java in this method. The components of the input array are stored as keys in the HashMap, and their occurrences are stored as values in the HashMap. If a key’s value is greater than one (>1), that key is a duplicate element.

What is array and how it is useful for daily life to humans

A data structure that contains a group of elements is known as an array. These items are often all of the same data type, such as an integer or a string.

In computer programs, arrays are widely used to organize data so that a related group of numbers can be readily sorted or searched.

Real-life examples of arrays include post office boxes, book pages, egg cartons, and chess pieces.

How to calculate array length in java program

The array length in Java refers to the maximum number of elements that an array can hold. The length of an array cannot be determined using any predefined method. The array attribute length in Java can be used to determine the array length. This attribute is used in conjunction with the array name.