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Java Array Exercises: Shuffle a given array of integers

Java Array: Exercise-60 with Solution

Write a Java program to shuffle a given array of integers.

Example:
Input :
nums = { 1, 2, 3, 4, 5, 6 }
Output:
Shuffle Array: [4, 2, 6, 5, 1, 3]

Sample Solution:

Java Code:

import java.util.Arrays;
import java.util.Random;

class solution
{
	public static void shuffle(int nums[])
	{
		for (int i = nums.length - 1; i >= 1; i--)
		{
			Random rand = new Random();

			int j = rand.nextInt(i + 1);

			swap_elements(nums, i, j);
		}
	}
        private static void swap_elements(int[] nums, int i, int j) {
		int temp = nums[i];
		nums[i] = nums[j];
		nums[j] = temp;
	}
	public static void main (String[] args)
	{
		int[] nums = { 1, 2, 3, 4, 5, 6 };
        System.out.println("Original Array: "+Arrays.toString(nums));
		shuffle(nums);
		System.out.println("Shuffle Array: "+Arrays.toString(nums));
	}
}

Sample Output:

Original Array: [1, 2, 3, 4, 5, 6]
Shuffle Array: [4, 2, 6, 5, 1, 3] 

Flowchart:

Flowchart: Shuffle a given array of integers

Java Code Editor:

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Next: Write a Java program to rearrange a given array of unique elements such that every second element of the array is greater than its left and right elements.

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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