Tuesday, March 6, 2012

How do I shuffle elements of an array in Java?


import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class ArrayShuffle {
        public static void main(String[] args) {
                // Initialize the contents of our array
                String[] alphabets = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J"};
                
                // As the Collections.shuffle method need a list for the parameter we
                // convert our array into List using the Arrays class.
                List<String> list = Arrays.asList(alphabets);
                
                // Here we just simply used the shuffle method of Collections class
                // to shuffle out defined array.
                Collections.shuffle(list);
                
        // Run the code again and again, then you'll see how simple we do shuffling
                for (String alpha : list) {
                        System.out.print(alpha + " ");
                }
        }
}

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