密码验证合格程序

题目描述

密码要求:

 

 

 

1.长度超过8位

 

 

 

2.包括大小写字母.数字.其它符号,以上四种至少三种

 

 

 

3.不能有相同长度超2的子串重复

 

 

 

说明:长度超过2的子串

输入描述:

一组或多组长度超过2的子符串。每组占一行

输出描述:

如果符合要求输出：OK，否则输出NG

示例1

输入

021Abc9000
021Abc9Abc1
021ABC9000
021$bc9000

输出

OK
NG
NG
OK

实现代码：

import java.util.Scanner;

public class Main{

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
String str = sc.nextLine();
String answer = JudgePassword(str);
System.out.println(answer);
}
}

public static String JudgePassword(String str){
int BigLetters_num = 0;
int SmallLetters_num = 0;
int Number_num = 0;
int Other_num = 0;
if(str.length()<=8){
return "NG";
}

for(int i=0;i<str.length();i++){
if(str.charAt(i)<='Z' && str.charAt(i)>='A'){
BigLetters_num = 1;
}else if(str.charAt(i)<='z' && str.charAt(i)>='a'){
SmallLetters_num = 1;
}else if(str.charAt(i)<='9' && str.charAt(i)>='0'){
Number_num = 1;
}else{
Other_num = 1;
}
}

int num = BigLetters_num +SmallLetters_num + Number_num + Other_num;
if(num < 3){
return "NG";
}

for(int i=0;i<str.length()-3;i++){
String str1 = str.substring(i, i+3);
String str2 = str.substring(i+3);
if(str2.contains(str1)){
return "NG";
}
}

return "OK";
}

}