Java random number generator

JAVA NUMBER GENERATOR

 package sudas.study.example.one;  
 import java.util.ArrayList;  
 import java.util.Collections;  
 import java.util.Random;  
 public class UniqueRandomNumber {  
      public static void main(String[] args) {  
           // TODO Auto-generated method stub  
           // new Random1().random();  
           // new Random2().random();  
           new Random3().random();  
      }  
 }  
 // this will create numbers not random from 1 to 10 but not unique  
 class Random1 {  
      public void random() {  
           // with arraylist  
           ArrayList<Integer> arraylist = new ArrayList<Integer>();  
           for (int i = 1; i <= 10; i++) {  
                arraylist.add(i);  
           }  
           for (int i = 1; i <= 10; i++) {  
                Integer randomNumbers = arraylist.get(i);  
                System.out.println("From ArrayList :" + randomNumbers.intValue());  
           }  
      }  
 }  
 // Random numbers are getting generated but numbers are not unique  
 class Random2 {  
      public void random() {  
           for (int i = 1; i <= 10; i++) {  
                Random random = new Random();  
                Object nextNo = random.nextInt(i);  
                System.out.println(nextNo);  
           }  
      }  
 }  
 // This is unique random number generator  
 class Random3 {  
      public void random() {  
           ArrayList<Integer> arraylist = new ArrayList<Integer>();  
           for (int i = 0; i <= 10; i++) {  
                arraylist.add(i);  
           }  
           Collections.shuffle(arraylist);  
           for (int i = 0; i < 10; i++) {  
                Integer randomNumbers = arraylist.get(i);  
                System.out.println("Unique Random Numbers :" + randomNumbers.intValue());  
           }  
      }  
 }