我目前正在上一门有关超技能的在线课程。有一个任务：
如果密码包含至少A个大写字母，至少B个小写字母，至少C个数字并且恰好包含N个符号，则很难破解。另外，密码不能包含两个或多个相同的字符，并且接连出现。对于给定的数字A，B，C，N，您应该输出符合这些要求的密码。
这是我的代码：
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int upper = scan.nextInt();
int lower = scan.nextInt();
int digits = scan.nextInt();
int quantity = scan.nextInt();
String symbolsUpper = "QWERTYUIOPASDFGHJKLZXCVBNM";
String symbolsLower = "qwertyuiopasdfghjklzxcvbnm";
String symbolsDigits = "1234567890";
boolean exit = false;
Random random = new Random();
ArrayList<Character> password = new ArrayList<>();
if (upper > 0) {
for (int i = 0; i < upper; i++) {
password.add(symbolsUpper.charAt(random.nextInt(symbolsUpper.length())));
}
}
if (lower > 0) {
for (int k = 0; k < lower; k++) {
password.add(symbolsLower.charAt(random.nextInt(symbolsLower.length())));
}
}
if (digits > 0) {
for (int z = 0; z < digits; z++) {
password.add(symbolsDigits.charAt(random.nextInt(symbolsDigits.length())));
}
}
if (quantity - digits - upper - lower > 0) {
for (int m = 0; m < (quantity - digits - upper - lower); m++) {
password.add(symbolsDigits.charAt(random.nextInt(symbolsDigits.length())));
}
}
Collections.shuffle(password);
while (!exit) {
if (password.size() > 1) {
for (int i = 1; i < password.size(); i++) {
if (password.get(i).equals(password.get(i - 1))) {
char buffer = password.get(i);
password.remove(i);
password.add(buffer);
i--;
} else {
exit = true;
}
}
} else {
exit = true;
}
}
StringBuilder buildPassword = new StringBuilder();
for (Character character : password) {
buildPassword.append(character);
}
System.out.println(buildPassword);
}
}
当我在IntelliJ IDEA中运行代码时，该程序可以正常运行，但是hyperskill平台不接受此代码作为正确的代码。主题是“处理字符串”。
有人可以告诉我，我做错了什么吗？有没有更好的方法来编写此代码？
我不知道您是否正在尝试获得最佳性能，但这是一个有趣的解决方案：
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int uppers = scan.nextInt();
int lowers = scan.nextInt();
int digits = scan.nextInt();
int quantity = scan.nextInt();
int freeChoices = quantity - uppers - lowers - digits;
if (freeChoices < 0) {
System.exit(1);
}
ThreadLocalRandom r = ThreadLocalRandom.current();
StringBuilder password = new StringBuilder();
boolean isPasswordReady = false;
int lastUpper = -1, lastLower = -1, lastDigit = -1;
PasswordPart[] options = PasswordPart.values();
while (!isPasswordReady) {
int partChoice = r.nextInt(0, options.length);
switch (options[partChoice]) {
case DIGIT:
if (digits > 0 || freeChoices > 0) {
CharIndexHolder result = options[partChoice].get(lastDigit, -1, r);
password.append(result.c);
lastDigit = result.i;
if (digits == 0) {
freeChoices--;
} else {
digits--;
}
}
break;
case LOWER:
if (lowers > 0 || freeChoices > 0) {
CharIndexHolder result = options[partChoice].get(lastLower, lastUpper, r);
password.append(result.c);
lastLower = result.i;
if (lowers == 0) {
freeChoices--;
} else {
lowers--;
}
}
break;
case UPPER:
if (uppers > 0 || freeChoices > 0) {
CharIndexHolder result = options[partChoice].get(lastUpper, lastLower, r);
password.append(result.c);
lastUpper = result.i;
if (uppers == 0) {
freeChoices--;
} else {
uppers--;
}
}
break;
}
isPasswordReady = uppers == 0 && lowers == 0 && digits == 0 && freeChoices == 0;
}
System.out.println(password.toString());
}
enum PasswordPart {
UPPER("QWERTYUIOPASDFGHJKLZXCVBNM"), LOWER("qwertyuiopasdfghjklzxcvbnm"), DIGIT("1234567890");
private String pool;
PasswordPart(String pool) {
this.pool = pool;
}
public CharIndexHolder get(int lastIndex, int additionalIndex, ThreadLocalRandom random) {
int i = random.nextInt(0, pool.length());
while (i == lastIndex || i == additionalIndex) {
i = random.nextInt(0, pool.length());
}
return new CharIndexHolder(pool.charAt(i), i);
}
}
private static class CharIndexHolder {
char c;
int i;
CharIndexHolder(char c, int i) {
this.c = c;
this.i = i;
}
}
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