Thinking in java学习笔记之set

   Random rand = new Random(47);
	   Set<Integer> set = new HashSet<Integer>();
	   for(int i=0;i<10000;i++){
		   set.add(rand.nextInt(30));
		   System.out.println(set);
	   }//输出/*

[8][5, 8][5, 8, 13][5, 8, 11, 13][1, 5, 8, 11, 13][1, 5, 8, 11, 13, 29][1, 5, 8, 11, 28, 13, 29][1, 20, 5, 8, 11, 28, 13, 29][1, 20, 5, 8, 11, 28, 12, 13, 29][1, 20, 5, 7, 8, 11, 28, 12, 13, 29][1, 18, 20, 5, 7, 8, 11, 28, 12, 13, 29][1, 18, 20, 5, 7, 8, 11, 28, 12, 13, 29]

*/

2.应用