do...While用法

public class IceCream {
	private static Random random = new Random(47);
	private static final String[] FLAVORS = new String[]{"A","B","C","D","E","F","G","H","I","J","K"};
	
	public static String[] flavorSet(int n){
		if(n>FLAVORS.length)
			throw new IllegalArgumentException("Set too big");
		String[] result = new String[n];
		boolean[] picked = new boolean[FLAVORS.length];//判断是否重复
		for (int i = 0; i < n; i++) {
			int t ;
			do {
				t = random.nextInt(FLAVORS.length);
			} while (picked[t]);//false：不重复的 true：重复的，会再次的循环
				result[i] = FLAVORS[t];
				picked[t] = true;
		}
		return result;
	}
	public static void main(String[] args) {
		System.out.println(Arrays.toString(flavorSet(3)));
	}
}