w3resource

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

Visualize Java code execution (Python Tutor):


Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to reverse an array of integer values.
Next: Write a Java program to find the duplicate values of an array of string values.

What is the difficulty level of this exercise?



Java: Tips of the Day

Different between parseInt() and valueOf() in java?

Well, the API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns a primitive int.

If you want to enjoy the potential caching benefits of Integer.valueOf(int), you could also use this eyesore:

Integer k = Integer.valueOf(Integer.parseInt("123"))

Now, if what you want is the object and not the primitive, then using valueOf(String) may be more attractive than making a new object out of parseInt(String) because the former is consistently present across Integer, Long, Double, etc.

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