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:

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:

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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
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