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Java Array Exercises: Test if an array contains a specific value

Java Array: Exercise-5 with Solution

Write a Java program to test if an array contains a specific value.

Pictorial Presentation:

Java Array Exercises: Test if an array contains a specific value

Sample Solution:

Java Code:

public class Exercise5 {
  public static boolean contains(int[] arr, int item) {
      for (int n : arr) {
         if (item == n) {
            return true;
         }
      }
      return false;
   }
   public static void main(String[] args) {
          int[] my_array1 = {
            1789, 2035, 1899, 1456, 2013, 
            1458, 2458, 1254, 1472, 2365, 
            1456, 2265, 1457, 2456};
      System.out.println(contains(my_array1, 2013));
      System.out.println(contains(my_array1, 2015));
   }
}

Sample Output:

true                                                                                                       
false 

Flowchart:

Flowchart: Java exercises: Test if an array contains a specific value

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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