问题

如何使用类似以下方法：
```java
private boolean respectPattern(String password) {
  Pattern passwordPattern = Pattern.compile(
    "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[.@$!%*?&])[A-Za-z\\d@$!%*?&.]{8,}$",
    Pattern.CASE_INSENSITIVE);
  Matcher matcher = passwordPattern.matcher(password);
  return matcher.find();
}

如果我将 password 类型替换为 StringBuffer 或者 char[] 呢？

<details>
<summary>英文:</summary>

How can I use a method like this

private boolean respectPattern(String password) {
Pattern passwordPattern = Pattern.compile(
"^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[.@$!%?&])[A-Za-z\d@$!%?&.]{8,}$",
Pattern.CASE_INSENSITIVE);
Matcher matcher = passwordPattern.matcher(password);
return matcher.find();
}

If I replace `password` type with `StringBuffer` or `char[]`?


</details>


# 答案1
**得分**: 3

Method `matcher()` in class `java.util.regex.Pattern` takes a single parameter whose type is [CharSequence][1] which is an interface. According to the _javadoc_, there are several implementing classes, including `StringBuffer`. If none of the existing implementations are suitable for your needs, you can always write your own implementation.

For example, using a [CharBuffer][2]
```java
CharBuffer cb = CharBuffer.allocate(11);
cb.put(new char[]{'S','e','c','r','e','t',' ','P','a','s','s'});
Pattern passwordPattern = Pattern.compile(
                "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[.@$!%*?&amp;])[A-Za-z\\d@$!%*?&amp;.]{8,}$",
                Pattern.CASE_INSENSITIVE);
Matcher matcher = passwordPattern.matcher(cb);

CharBuffer cb = CharBuffer.allocate(11);
cb.put(new char[]{'S','e','c', 'r', 'e', 't', ' ', 'P', 'a', 's', 's'});
Pattern passwordPattern = Pattern.compile(
                "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[.@$!%*?&])[A-Za-z\\d@$!%*?&.]{8,}$",
                Pattern.CASE_INSENSITIVE);
Matcher matcher = passwordPattern.matcher(cb);

答案2

得分: 1

如果你将密码类型替换为 StringBuffer：

按原样使用，即以下代码将能够成功编译并按预期工作：

private boolean respectPattern(StringBuffer password) {
    Pattern passwordPattern = Pattern.compile(
            "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[.@$!%*?&])[A-Za-z\\d@$!%*?&.]{8,}$",
            Pattern.CASE_INSENSITIVE);
    Matcher matcher = passwordPattern.matcher(password);
    return matcher.find();
}

如果你将密码类型替换为 char[]：

使用 passwordPattern.matcher(String.valueOf(password));。

private boolean respectPattern(StringBuffer password) {
    Pattern passwordPattern = Pattern.compile(
            "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[.@$!%*?&])[A-Za-z\\d@$!%*?&.]{8,}$",
            Pattern.CASE_INSENSITIVE);
    Matcher matcher = passwordPattern.matcher(password);
    return matcher.find();
}