Java program to find the common strings in two string arrays

Program to find common strings in two string arrays in java

import java.util.Arrays;
import java.util.HashSet;

public class ExArrayCommon {
  public static void main(String[] args) {
    // enter string value.
    String[] array1 = {
      "C",
      "C++",
      "C#",
      "JAVA",
      "SQL",
      "ORACLE"
    };

    String[] array2 = {
      "MySQL",
      "SQL",
      "Android",
      "ORACLE",
      "PostgreSQL",
      "DB2",
      "JAVA"
    };

    // print both the string.
    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]);
        }
      }
    }
    // return common elements.
    System.out.println("Common element : " + (set));
  }
}

Output

    Array1 : [C, C++, C#, JAVA, SQL, ORACLE]
    Array2 : [MySQL, SQL, Android, ORACLE, PostgreSQL, DB2, JAVA]
    Common element : [JAVA, ORACLE, SQL]