明明的随机数（java）

import java.util.Iterator;
import java.util.Scanner;
import java.util.TreeSet;

public class RandomDataSort {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int num = scan.nextInt();
		
		TreeSet tSet = new TreeSet();
		while (num != 0) {
			tSet.add(scan.nextInt());
			num--;
		}
		
		Iterator it = tSet.iterator();
		while (it.hasNext()) {
			System.out.println(it.next());
		}
	}

}

TreeSet的用法：

详情见：http://www.cnblogs.com/ningvsban/archive/2013/05/06/3062535.html