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Java Array Exercises: Insert an element into an array

Java Array: Exercise-9 with Solution

Write a Java program to insert an element (specific position) into an array.

Pictorial Presentation:

Java Array Exercises: Insert an element into an array

Sample Solution:

Java Code:

import java.util.Arrays; 
public class Exercise9 {
 
public static void main(String[] args) {

   int[] my_array = {25, 14, 56, 15, 36, 56, 77, 18, 29, 49};

    // Insert an element in 3rd position of the array (index->2, value->5)
   
   int Index_position = 2;
   int newValue    = 5;

  System.out.println("Original Array : "+Arrays.toString(my_array));     
   
  for(int i=my_array.length-1; i > Index_position; i--){
    my_array[i] = my_array[i-1];
   }
   my_array[Index_position] = newValue;
   System.out.println("New Array: "+Arrays.toString(my_array));
 }
 }
 

Sample Output:

Original Array : [25, 14, 56, 15, 36, 56, 77, 18, 29, 49]                                                     
New Array: [25, 14, 5, 56, 15, 36, 56, 77, 18, 29] 

Flowchart:

Flowchart: Java exercises: Insert an element into an array

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Java Code Editor:

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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