Bubble Sort - java 1.5

package sorting;  
 import java.util.ArrayList;  
 import java.util.List;  
 import java.util.Random;  
 public class BubbleSort {  
   private static List<Integer> sort(List<Integer> data) {  
     boolean swapFlag;  
     do {  
       swapFlag = false;  
       for (int i = 0; i < data.size() - 1; i++) {  
         if (data.get(i) > data.get(i + 1)) {  
           int tmp = data.get(i + 1);  
           data.set(i + 1, data.get(i));  
           data.set(i, tmp);  
           swapFlag = true;  
         }  
       }  
     } while (swapFlag);  
     return data;  
   }  
   public static void main(String[] args) {  
     List<Integer> unsortedData = new ArrayList<Integer>();  
     int size = new Random().nextInt(100);  
     for (int i = 0; i < size; i++) {  
       unsortedData.add(new Random().nextInt(100));  
     }  
     printSort("Unsorted data :", unsortedData);  
     printSort("Sorted data :", sort(unsortedData));  
   }  
   private static void printSort(String message, List<Integer> data) {  
     System.out.println(message);  
     for (int item : data) {  
       System.out.print(item + " ");  
     }  
     System.out.println("\n");  
   }  
 }