60 lines
1.7 KiB
Java
60 lines
1.7 KiB
Java
/*
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This is java implementation of the Fisher–Yates shuffle (named after Ronald Fisher and Frank Yates)algorithm, also known as the Knuth shuffle (after Donald Knuth), for generating a random permutation of a finite set—in plain terms, for randomly shuffling the set.
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*/
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//This is a sample program to shuffle the elements of an array using Fisher Yates Array Shuffling algorithm
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import java.util.Random;
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import java.util.Scanner;
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public class Fisher_Yates_Array_Shuffling
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{
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static int[] fisherYatesShuffling(int []arr, int n)
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{
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int []a = new int[n];
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int []ind = new int[n];
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for(int i=0; i<n; i++)
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ind[i] = 0;
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int index;
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Random rand = new Random();
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for(int i=0; i<n; i++)
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{
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do
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{
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index = rand.nextInt(n);
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}
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while(ind[index] != 0);
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ind[index] = 1;
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a[i] = arr[index];
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}
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return a;
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}
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public static void main(String agrs[])
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{
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Scanner sc = new Scanner(System.in);
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System.out.println("Enter the array size: ");
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int n = sc.nextInt();
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System.out.println("Enter the array elements: ");
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int []a = new int[n];
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int []res = new int[n];
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for(int i=0; i<n; i++)
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{
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a[i] = sc.nextInt();
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}
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res = fisherYatesShuffling(a, n);
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for(int i=0; i<n; i++)
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{
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System.out.print(res[i]+" ");
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}
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sc.close();
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}
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}
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/*
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Enter the array size:
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12
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Enter the array elements:
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1 2 3 4 5 6 7 8 9 10 11 12
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The shuffled elements are:
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7 10 8 4 9 6 12 3 2 1 5 11 |