题解 | #密码验证合格程序#

import java.util.*;
import java.util.regex.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String str = sc.nextLine();
            //判断长度是否超过8位
            if(str.length()<=8){
                System.out.println("NG");
                continue;
            }
            //判断.包括大小写字母.数字.其它符号,以上四种至少三种
            if(!checkPassWord(str)){
                System.out.println("NG");
                continue;
            }
            //判断是否有重复元素
            if(!checkChongFu(str)){
                System.out.println("NG");
                continue;
            }
            
            System.out.println("OK");

        }
    }
    
    
    
    //.包括大小写字母.数字.其它符号,以上四种至少三种
    private static boolean checkPassWord(String str){
        int count = 0;
        Pattern lowerCase = Pattern.compile("[a-z]");
        if(lowerCase.matcher(str).find()){
            count++;
        }
        Pattern upperCase = Pattern.compile("[A-Z]");
        if(upperCase.matcher(str).find()){
            count++;
        }
        Pattern number = Pattern.compile("[0-9]");
        if(number.matcher(str).find()){
            count++;
        }
        Pattern other = Pattern.compile("[^a-zA-Z0-9]");
        if(other.matcher(str).find()){
            count++;
        }
        if(count<3){
            return false;
        }
        return true;
        
    }
    
    private static boolean checkChongFu(String str){
        for(int i=0,j=i+3;j<=str.length();i++,j++){
            if(str.substring(j).contains(str.substring(i,j))){
                return false;
            }
        }
        return true;
    }
}