Rotate and shuffle a list « Collections « Collections

Return	Method	Summary
static void	rotate(List<?> list, int distance)	Rotates the elements in the specified list by the specified distance.
static void	shuffle(List<?> list)	Randomly permutes the specified list using a default source of randomness.
static void	shuffle(List<?> list, Random rnd)	Randomly permute the specified list using the specified source of randomness.


  import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

public class Main {

  public static void main(String args[]) {
    List<Character> list = new LinkedList<Character>();

    for (char n = 'A'; n <= 'Z'; n++)
      list.add(n);

    Collections.shuffle(list);

    System.out.print(list);

  }
}


[L, B, P, U, K, C, O, W, Y, T, G, R, Z, J, I, N, S, A, Q, D, H, X, F, M, E, V]


import java.util.ArrayList;
import java.util.Collections;

public class Main {
  public static void main(String[] args) {
    ArrayList arrayList = new ArrayList();
    arrayList.add("A");
    arrayList.add("B");
    arrayList.add("C");
    arrayList.add("D");
    arrayList.add("java2s.com");
    System.out.println("Before shuffling: " + arrayList);
    Collections.shuffle(arrayList);
    System.out.println("After shuffling: " + arrayList);
  }
}


Before shuffling: [A, B, C, D, java2s.com]
After shuffling: [java2s.com, B, C, A, D]


import java.util.Collections;
import java.util.Vector;

public class Main {
  public static void main(String[] args) {
    Vector v = new Vector();
    v.add("1");
    v.add("2");
    v.add("3");
    v.add("4");
    v.add("java2s.com");
    System.out.println("Before shuffling: " + v);
    Collections.shuffle(v);
    System.out.println("After shuffling: " + v);
  }
}


Before shuffling: [1, 2, 3, 4, java2s.com]
After shuffling: [3, 4, 2, java2s.com, 1]


  import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

public class Main {
  public static void main(String args[]) {
    List<Character> list = new LinkedList<Character>();

    for (char n = 'A'; n <= 'F'; n++)
      list.add(n);

    System.out.println("Here is the original list: ");
    System.out.println(list);
    Collections.rotate(list, 2);

    System.out.println(list);

  }
}


Here is the original list: 
[A, B, C, D, E, F]
[E, F, A, B, C, D]