(Relax ST1.4)POJ 1056 IMMEDIATE DECODABILITY(判断一个字符串是否是另外一个字符串的前缀)

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class POJ_1056 {

public static boolean isPrefix(String a,String b){
int len = a.length() > b.length() ? b.length() : a.length();

if(a.substring(0, len).equals(b.substring(0,len))){
return true;
}

return false;
}

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

String temp;
List<String> list  = new ArrayList<String>();
int counter = 1;
while(scanner.hasNext()){
temp = scanner.next();

if(temp.equals("9")){

int size = list.size();

int i,j;
boolean flag = true;
for(i = 0 ; i < size - 1 ; ++i){
for(j = i+1 ; j < size ; ++j){
//判断一个字符串是否是另外一个字符串的前缀可以这样做...
if(list.get(i).startsWith(list.get(j)) || list.get(j).startsWith(list.get(i))){
flag = false;
break;
}

//						//也可以写成
//						if(isPrefix(list.get(i), list.get(j))){
//							flag = false;
//							break;
//						}
}

if(!flag){
break;
}
}

if(!flag){
System.out.println("Set "+(counter++)+" is not immediately decodable");
}else{
System.out.println("Set "+(counter++)+" is immediately decodable");
}

list.clear();
}else{
list.add(temp);
}
}
}
}