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 Java > Random Numbers > Shuffle

Shuffle 

The following code shows the generation of random numbers with in some range and suffling the user provided list. The logic is that we randomly pick a number from the given range and add to the final list. This process continues util all elements in the range are processed.

File Name  :  
com/bethecoder/tutorials/random/Shuffle.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.random;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Shuffle {

  public static void main(String[] args) {
      
    List<Integer> shuffledItems = shuffle(110);
    System.out.println(shuffledItems);
    
    List<String> shuffledStringItems = shuffle(Arrays.asList(new String [] {
        "one""two""three""four""five""six""seven""eight"    
    }));
    
    System.out.println(shuffledStringItems);
  }
  
  public static List<Integer> shuffle(Integer start, Integer count) {
    
    List<Integer> items =  new ArrayList<Integer>(count);
    List<Integer> shuffledItems =  new ArrayList<Integer>(count);
    
    for (int i = ; i < count ; i ++ ) {
      items.add(start + i);
    }
    
    while (items.size() 0) {
      shuffledItems.add(items.remove((int)(1729 * Math.random()) % items.size()));
    }
    
    return shuffledItems;
  }
  
  public static List<String> shuffle(List<String> items) {
    
    List<Integer> shuffledItems = shuffle(0, items.size());
    List<String> shuffledStringItems =  new ArrayList<String>(items.size());
    
    for (int i = ; i < shuffledItems.size() ; i ++ ) {
      shuffledStringItems.add(items.get(shuffledItems.get(i)));
    }
    
    return shuffledStringItems;
  }
}
   

It gives the following output,
[4, 6, 8, 7, 2, 3, 1, 9, 5, 10]
[five, three, four, six, one, eight, two, seven]

[9, 1, 10, 4, 7, 2, 6, 8, 3, 5]
[five, seven, eight, six, four, three, one, two]


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