Java: Find The Duplicate Values Of An Array Of Integers - W3resource

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Java: Find the duplicate values of an array of integer values

Last update on May 09 2025 12:48:38 (UTC/GMT +8 hours)

12. Find duplicates in integer array

Write a Java program to find duplicate values in an array of integer values.

Pictorial Presentation:

Java Array Exercises: Find the duplicate values of an array of integer values

Sample Solution:

Java Code:

// Import the Arrays class from the java.util package. import java.util.Arrays; // Define a class named Exercise12. public class Exercise12 { // The main method where the program execution starts. public static void main(String[] args) { // Declare and initialize an integer array 'my_array'. int[] my_array = {1, 2, 5, 5, 6, 6, 7, 2}; // Iterate through the elements of the array. for (int i = 0; i < my_array.length-1; i++) { for (int j = i+1; j < my_array.length; j++) { // Check if two elements are equal and not the same element. if ((my_array[i] == my_array[j]) && (i != j)) { // If a duplicate is found, print the duplicate element. System.out.println("Duplicate Element : " + my_array[j]); } } } } }

Sample Output:

Duplicate Element : 2 Duplicate Element : 5 Duplicate Element : 6

Flowchart:

Flowchart: Java exercises: Find the duplicate values of an array of integer values

For more Practice: Solve these Related Problems:

  • Write a Java program to count the number of duplicate values in an integer array.
  • Write a Java program to remove all duplicate values from an integer array.
  • Write a Java program to find the most frequently occurring number in an array.
  • Write a Java program to return a list of unique numbers from an array by removing duplicates.

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