Random Unique Generation

Random Unique Generation logic-

a) Pick any random index from [0-n] array

b) Fetch value from array[random]

c) Swap value to last array[last] 

/* @Description- Class Generating unique random Generator

 * @author- Paras

 * */

public class RandomUniqueGenerator {

     static int maxI;

     static int uniqueArray[]= new int[11];

     public static void main(String[] args) {

          /* Create an array of 0 to 10 number*/

          for(int i=0;i<=10;i++)

              uniqueArray[i]=i;

         

          /*maxI denotes last index*/

          maxI=uniqueArray[uniqueArray.length-1];

         

          while(maxI >=0){

              /* pick any random index */

              int randomIndex = (int)(Math.random()*maxI);

              System.out.println("Index comes out to be "+ randomIndex);

              System.out.println("Random number found to be "+ uniqueArray[randomIndex]);

              swap(randomIndex);

     };

     }

     static void swap(int index){

          /*swap array[r] and array[maxI]*/

          int temp=uniqueArray[maxI];

          uniqueArray[maxI]=uniqueArray[index];

          uniqueArray[index]=temp;

          maxI--;

     }

}

Output

Index comes out to be 5

Random number found to be 5

Index comes out to be 3

Random number found to be 3

Index comes out to be 3

Random number found to be 9

Index comes out to be 5

Random number found to be 10

Index comes out to be 2

Random number found to be 2

Index comes out to be 2

Random number found to be 6

Index comes out to be 3

Random number found to be 8

Index comes out to be 2

Random number found to be 7

Index comes out to be 1

Random number found to be 1

Index comes out to be 0

Random number found to be 0

Index comes out to be 0

Random number found to be 4