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Java Array Exercises: Find the common elements between two arrays

Java Array: Exercise-14 with Solution

Write a Java program to find the common elements between two arrays (string values).

Pictorial Presentation:

Java Array Exercises: Find the common elements between two arrays

Sample Solution:

Java Code:

import java.util.*;
public class Exercise14 {
public static void main(String[] args) 
    {
       String[] array1 = {"Python", "JAVA", "PHP", "C#", "C++", "SQL"};
 
       String[] array2 = {"MySQL", "SQL", "SQLite", "Oracle", "PostgreSQL", "DB2", "JAVA"};
       
       System.out.println("Array1 : "+Arrays.toString(array1));
       System.out.println("Array2 : "+Arrays.toString(array2));
 
       HashSet<String> set = new HashSet<String>();
 
        for (int i = 0; i < array1.length; i++)
        {
            for (int j = 0; j < array2.length; j++)
            {
                if(array1[i].equals(array2[j]))
                {
                    set.add(array1[i]);
                }
            }
        }
 
        System.out.println("Common element : "+(set));     //OUTPUT : [THREE, FOUR, FIVE]
    }
}

Sample Output: 

Array1 : [Python, JAVA, PHP, C#, C++, SQL]                                                                    
Array2 : [MySQL, SQL, SQLite, Oracle, PostgreSQL, DB2, JAVA]                                                  
Common element is : [JAVA, SQL]

Flowchart:

Flowchart: Java exercises: Find the common elements between two arrays

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Next: Write a Java program to find the common elements between two arrays of integers.

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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