DuplicateElement.java

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/*Java Program to find duplicate elements in Array from User Input*/
import java.util.Scanner;

public class DuplicateElement {  
public static void main(String[] args) {
	
        //Declare int type array to store user entered values; 
        int [] numbers;
		
		Scanner scanner = new Scanner(System.in); // Create an object of Scanner Class
		
		System.out.println("Enter size of array");
		int sizeOfArray = scanner.nextInt(); // get how many elements user want to store in numbers array;
		
		numbers = new int[sizeOfArray]; // set size of array to store elements from user input
		
		System.out.println("Put elements in array");
		for(int i=0; i<sizeOfArray; i++){
			
			// read array element until it reaches the size of array
			int arrayElement = scanner.nextInt();
			numbers[i] = arrayElement;
		}
		
		// Print all elements of numbers array 
		System.out.println("all elements of array:");
		for(int i=0; i<numbers.length; i++){
			System.out.print(numbers[i]+", ");
		}
		
        System.out.println("\nDuplicate elements in given array: ");  
        //Searches for duplicate element  
        for(int i = 0; i < numbers.length; i++) {  
            for(int j = i + 1; j < numbers.length; j++) {  
                if(numbers[i] == numbers[j])  
                    System.out.println(numbers[j]);  
            }  
        }  
		
		/* How above code works?		
		it will take one by one element of an array then compare one by one with all other elements in array
		Ex. if array elements are 1, 2, 3, 1
		then first it will take 1 from array and compare it with all other elements
		after that it will take 2 and compare it with all other elements... so on*/
    }  
}

/*----------OUTPUT----------
Enter size of array
5
Enter elements in an array
5
6
2
3
6
all elements of array:
5, 6, 2, 3, 6,
Duplicate elements in given array:
6
*/