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.hasNextLine()){
String code = sc.nextLine();
boolean isOk = checkIsOk(code);
if(isOk) System.out.println("OK");
else System.out.println("NG");
}

}
//检查是否达到要求
public static boolean checkIsOk(String code){
    boolean isOk = false;
    if(code.length()>8){
        if(!isRepeated(code)){
            char[] chars = code.toCharArray();
            int numMode = 0;
            if(Pattern.compile("[a-z]").matcher(code).find()){
                numMode++;
            }
            if(Pattern.compile("[A-Z]").matcher(code).find()){
                numMode++;
            }
            if(Pattern.compile("[0-9]").matcher(code).find()){
                numMode++;
            }
            if(Pattern.compile("[^a-zA-Z0-9]").matcher(code).find()){
                numMode++;
            }
            if(numMode>=3) isOk=true;
        }
    }
    return isOk;
}
//检查是否有重复子串
public static boolean isRepeated(String code){
    boolean isRepeated = false;
    Set<String> ss = new HashSet<String>();
    for(int i =0; i<code.length()-3; i++){
        if(!ss.add(code.substring(i,i+3)))
            isRepeated = true;
    }
    return isRepeated;
}

}