gct 专业课考了个折半查找算法

public class Test {/** * @param args */public static void main(String[] args) throws Exception {int i = findKey(1,st.length);System.out.println(i);}private static int[] st  = {10,20,5,7,11,5,7,11};private static int key = 10;public static int findKey(int start,int end){int middle = (start+end)/2;int ret =0;if(st[middle-1] == key) return middle;else{if(middle>start)ret = findKey(start,middle-1);if(ret==0){if(middle<end) ret = findKey(middle+1,end);}if(ret !=0) return ret;}return 0;}}