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Java program to shuffle the contents of array uniquely without repetition..

Java Code : Shuffling of Arrays uniquely

/* Program to shuffle the contents of the array elements
 *
 * @author Code Author
 */
import java.util.*;
public class Array_shuffle {

    //method to shuffle the array uniquely
public static void shuffle(int a[])
   {
        int n = a.length;
        Random rand = new Random();  //using random function so as to randomly shuffle the contents of array
      
        for(int i=0;i<n;i++)
        {
            int change = i + rand.nextInt(n - i);
            swap(a,change,i); //calling swap method
            
        }
      
   }
    
//swap method swaps the chaged value with the positional value of i of the array
public static void swap(int[] a,int change,int i)
    {
    int temp = a[i];  //intially stored in temporary variable then swaping
    a[i] = a[change];
    a[change] = temp;
    }
    

//method to display the contents of the array --no need of explaination
public static void display(int[] a)
    {
        for(int na:a)
           System.out.print(na+" ");
    }
    

public static void main(String[] args) {
       Scanner console = new Scanner(System.in);
       int it=1;
       
       //create the array using specified number of the elements
       System.out.print("Enter the number of elements in the array : ");
       int n = console.nextInt();
       int[] a= new int[n];       //array created of size n
       
       
       //now adding the contents to the array
       System.out.println("\nFill the contents of the array : ");
        for(int j=0;j<a.length;j++ )
            a[j] = console.nextInt();
        
         //getting number of times to be shuffled
       System.out.println("Enter number of times array should be shuffled : ");
       int t =console.nextInt();
       
        
        //displaying the current array
        System.out.println("\nCurrent Array : ");
        display(a);
        
        while (t>0)
        {
            //calling the shuffle function to shuffle the array contents 
             shuffle(a);
        
            //Displaying the shuffled array
             System.out.printf("\nShuffled Array %dst Time : ",it);
             display(a);
             it++;
             t--;
        }

    }

}

Enter the number of elements in the array : 10
Fill the contents of the array : 2 6 8 10 12 1 3 7 20 25
Enter number of times array should be shuffled : 5

Current Array : 2 6 8 10 12 1 3 7 20 25 

Shuffled Array 1st Time : 1 12 7 20 3 2 6 8 25 10 
Shuffled Array 2st Time : 7 25 1 2 3 12 6 20 8 10 
Shuffled Array 3st Time : 2 20 1 25 12 3 8 10 6 7 
Shuffled Array 4st Time : 1 10 7 2 25 3 12 6 8 20 
Shuffled Array 5st Time : 25 12 6 3 10 20 8 7 2 1 

Posted by Unknown at 9:05 PM

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Labels: array , change , iterative , java , math.rand() , program.test cases , ran() , random , shuffle , shuffles , swap , temp , uniquely