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

Java Array: Exercise-12 with Solution

Write a Java program to find the duplicate values of 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 java.util.Arrays; 
public class Exercise12 {
  public static void main(String[] args) 
    {
        int[] my_array = {1, 2, 5, 5, 6, 6, 7, 2};
 
        for (int i = 0; i < my_array.length-1; i++)
        {
            for (int j = i+1; j < my_array.length; j++)
            {
                if ((my_array[i] == my_array[j]) && (i != j))
                {
                    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

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb