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Java Array Exercises: Find the common elements between two arrays of integers

Java Array: Exercise-15 with Solution

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

Pictorial Presentation:

Java Array Exercises: Find the common elements between two arrays of integers

Sample Solution:

Java Code:

import java.util.Arrays; 
public class Exercise15 {
public static void main(String[] args) 
    {
      int[] array1 = {1, 2, 5, 5, 8, 9, 7, 10};
      int[] array2 = {1, 0, 6, 15, 6, 4, 7, 0};
 
       System.out.println("Array1 : "+Arrays.toString(array1));
       System.out.println("Array2 : "+Arrays.toString(array2));
 
      
        for (int i = 0; i < array1.length; i++)
        {
            for (int j = 0; j < array2.length; j++)
            {
                if(array1[i] == (array2[j]))
                {
                 
                 System.out.println("Common element is : "+(array1[i]));
                 }
            }
        }
 
    }
}

Sample Output:

Array1 : [1, 2, 5, 5, 8, 9, 7, 10]                                                                            
Array2 : [1, 0, 6, 15, 6, 4, 7, 0]                                                                            
Common element is : 1                                                                                         
Common element is : 7

Flowchart:

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

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Java Code Editor:

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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