Java Exercises: BogoSort Sort Algorithm

Java Sorting Algorithm: Exercise-9 with Solution

Write a Java program to sort an array of positive integers using the BogoSort Sort Algorithm.

In computer science, bogosort is a particularly ineffective sorting algorithm based on the generate and test paradigm. The algorithm successively generates permutations of its input until it finds one that is sorted. It is not useful for sorting but may be used for educational purposes, to contrast it with other more realistic algorithms.

Sample Solution:

Java Code:

public class BogoSort 
{
	public static void main(String[] args)
	{
		//Enter array to be sorted here
		int[] arr={4,5,6,0,7,8,9,1,2,3};
 
		BogoSort now=new BogoSort();
		System.out.print("Unsorted: ");
		now.display1D(arr);
 
		now.bogo(arr);
 
		System.out.print("Sorted: ");
		now.display1D(arr);
	}
	void bogo(int[] arr)
	{
		//Keep a track of the number of shuffles
		int shuffle=1;
		for(;!isSorted(arr);shuffle++)
			shuffle(arr);
		//Boast
		System.out.println("This took "+shuffle+" shuffles.");
	}
	void shuffle(int[] arr)
	{
		//Standard Fisher-Yates shuffle algorithm
		int i=arr.length-1;
		while(i>0)
			swap(arr,i--,(int)(Math.random()*i));
	}
	void swap(int[] arr,int i,int j)
	{
		int temp=arr[i];
		arr[i]=arr[j];
		arr[j]=temp;
	}
	boolean isSorted(int[] arr)
	{
 
		for(int i=1;i<arr.length;i++)
			if(arr[i]<arr[i-1])
				return false;
		return true;
	}
	void display1D(int[] arr)
	{
		for(int i=0;i<arr.length;i++)
			System.out.print(arr[i]+" ");
		System.out.println();
	} 
}

Sample Output:

Unsorted: 4 5 6 0 7 8 9 1 2 3 
This took 3067022 shuffles.
Sorted: 0 1 2 3 4 5 6 7 8 9  

Flowchart:

Java Code Editor:

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