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Java Array Exercises: Find the index of an array element

Java Array: Exercise-6 with Solution

Write a Java program to find the index of an array element.

Pictorial Presentation:

Java Array Exercises: Find the index of an array element

Sample Solution:

Java Code:

public class Exercise6 {
       public static int  findIndex (int[] my_array, int t) {
        if (my_array == null) return -1;
        int len = my_array.length;
        int i = 0;
        while (i < len) {
            if (my_array[i] == t) return i;
            else i=i+1;
        }
        return -1;
    }
    public static void main(String[] args) {
      int[] my_array = {25, 14, 56, 15, 36, 56, 77, 18, 29, 49};
      System.out.println("Index position of 25 is: " + findIndex(my_array, 25));
      System.out.println("Index position of 77 is: " + findIndex(my_array, 77));
       }
}

Sample Output: 

Index position of 25 is: 0                                                                                    
Index position of 77 is: 6

Flowchart:

Flowchart: Java exercises: Find the index of an array element

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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