聽風流過

				 public class Order2 {
	static int num=1;

	private boolean isIn(int a[],int start,int num){
		for(int i=0;i<start;i++){
			if(a[i]==num)
				return true;
		}
		return false;
	}

	public void orderNumber(int[] a, int start, int deep, int length, int k) {
		int passNum[]=new int[length];
		int passLength=0;
		for (int i = start; i < length; i++) {
			if(isIn(passNum,passLength,a[i]))
				continue;

			passNum[passLength]=new Integer(a[i]).intValue();
			passLength++;

			int t = a[start];
			a[start] = a[i];
			a[i] = t;

			if (deep == 1) {
				System.out.print(num+++" ");
				for (int j = 0; j < k; j++)
					System.out.print(a[j]);
				System.out.println();
			} else
				orderNumber(a, start + 1, deep - 1, length, k);

			t = a[start];
			a[start] = a[i];
			a[i] = t;	
		}

	}

	public static void main(String arg[]){
		int a[]={1,2,2,4,5};
		int start=0;
		int deep=3;
		int length=5;
		new Order2().orderNumber(a, start, deep, length,deep);
	}
}