题解 | #密码验证合格程序#

感觉用正则表达式比较清晰

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String passWord = in.nextLine();
            System.out.println(checkePassWord(passWord) ? "OK" : "NG");
        }
    }
    public static boolean checkePassWord(String str) {
        boolean result = false;
        if (str.length() <= 8) return result;
        boolean isCharUp = false;
        boolean isCharLow = false;
        boolean isDigit = false;
        boolean isOther = false;
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            //System.out.println(c);
            if (isCharType(c) == TYPE_DIGIT && !isDigit) {
                count = count + 1;
                //System.out.println("c" + c + "isCharType(c)" + isCharType(c) + "isDigit" + isDigit);
                isDigit = true;
            }
            if (isCharType(c) == TYPE_CHAR_LOW && !isCharLow) {
                count = count + 1;
                //System.out.println("c" + c + "isCharType(c)" + isCharType(c) + "isCharLow" + isCharLow);
                isCharLow = true;
            }
            if (isCharType(c) == TYPE_CHAR_UP && !isCharUp) {
                count = count + 1;
                //System.out.println("c" + c + "isCharType(c)" + isCharType(c) + "isCharUp" + isCharUp);
                isCharUp = true;
            }
            if (isCharType(c) == TYPE_OtHER && !isOther) {
                count = count + 1;
               // System.out.println("c" + c + "isCharType(c)" + isCharType(c) + "isOther" + isOther);
                isOther = true;
            }
        }
        if (count < 3) return false;
        for (int i = 0; i < str.length() - 2; i++) {
            String shortStr = str.substring(i, i + 3);
            String longStr = str.substring(i+3);
                if (longStr.contains(shortStr)) {
                    return false;
                }
        }
        return true;
    }
    public static int TYPE_DIGIT = 0;
    public static int TYPE_CHAR_LOW = 1;
    public static int TYPE_CHAR_UP = 2;
    public static int TYPE_OtHER = 3;
    public static int isCharType(char c) {
        if (c >= '0' && c <= '9') {
           return TYPE_DIGIT;
        }
        if (c >= 'a' && c <= 'z') {
            return TYPE_CHAR_LOW;
        }
        if (c >= 'A' && c <= 'Z') {
           return TYPE_CHAR_UP;
        }
        return TYPE_OtHER;
    }
}