子串问题

//需求：求子串在主串中第一次出现的位置问题class  StringGetIndex{public static int index(String str,String tes,int pos){if(pos>0){int n = str.length();int m = tes.length();int i = pos;while(i<=n-m+1){String subString = str.substring(i,i+m);if(subString.compareTo(tes)==0){return i;}else i++;}}return 0;}public static void main(String[] args) {String str = "fghijklmnoabcdeabcdepqrstuvwxyz";String tes = "abcde";int  pos=1;int i = index(str,tes,pos);System.out.println(str.length()+"  "+tes.length()+"\n"+i);}}