本文整理了Java中java.lang.Character.isLetter()方法的一些代码示例，展示了Character.isLetter()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Character.isLetter()方法的具体详情如下：
包路径：java.lang.Character
类名称：Character
方法名：isLetter

Character.isLetter介绍

[英]Indicates whether the specified character is a letter.
[中]

代码示例

代码示例来源：origin: google/guava

@Override
public boolean matches(char c) {
 return Character.isLetter(c);
}

代码示例来源：origin: redisson/redisson

protected boolean shouldQuote(String string) {
  boolean ws = false;
  for (int ii = 0; ii < string.length(); ii++) {
    final char ch = string.charAt(ii);
    if (ii==0 && !Character.isLetter(ch) )
      return true;
    if (!Character.isLetterOrDigit(ch) && ch != '_' && ch != '-' && ch != '(' && ch != ')' && ch != '[' && ch != ']' && ch != '.') {
      ws = true;
      break;
    }
  }
  return ws;
}

代码示例来源：origin: prestodb/presto

@Override
public boolean matches(char c) {
 return Character.isLetter(c);
}

代码示例来源：origin: redisson/redisson

protected boolean isIdStart(int ch) {
  return Character.isLetter(ch) || ch == '$' || ch == '#' || ch == '_';
}

代码示例来源：origin: google/j2objc

@Override
public boolean matches(char c) {
 return Character.isLetter(c);
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Does the supplied content contain an XML opening tag. If the parse state is currently
 * in an XML comment then this method always returns false. It is expected that all comment
 * tokens will have consumed for the supplied content before passing the remainder to this method.
 */
private boolean hasOpeningTag(String content) {
  if (this.inComment) {
    return false;
  }
  int openTagIndex = content.indexOf('<');
  return (openTagIndex > -1 && (content.length() > openTagIndex + 1) &&
      Character.isLetter(content.charAt(openTagIndex + 1)));
}

代码示例来源：origin: stanfordnlp/CoreNLP

protected static boolean containsLetter(String s) {
 if (s == null) {
  return false;
 }
 for (int i = 0, len = s.length(); i < len; i++) {
  if (Character.isLetter(s.charAt(i))) {
   return true;
  }
 }
 return false;
}

代码示例来源：origin: stanfordnlp/CoreNLP

/**
 * Returns whether a part of speech tag is the tag for a punctuation mark (by
 * checking whether the first character is a letter.
 * 
 * @param label
 *          part of speech tag
 * @return whether the tag is (typically) assigned to punctuation
 */
private boolean isPunctuationLabel(String label) {
 return !Character.isLetter(label.charAt(0))
   && !(label.equals("$") || label.equals("%"));
}

代码示例来源：origin: stanfordnlp/CoreNLP

private static boolean hasLetter(String str) {
 if (str.length() < 1) {
  return false;
 }
 for (int i = 0; i < str.length(); i++) {
  if (Character.isLetter(str.charAt(i))) {
   return true;
  }
 }
 return false;
}

代码示例来源：origin: stanfordnlp/CoreNLP

private static int hasApostropheBlock(String s) {
 for(int i = s.length() - 1; i > 0; i --){
  if(s.charAt(i) == '\'' && i < s.length() - 1){
   return i;
  }
  if(! Character.isLetter(s.charAt(i))){
   return -1;
  }
 }
 return -1;
}

代码示例来源：origin: stanfordnlp/CoreNLP

protected static boolean containsAlphanumeric(String s) {
 if (s == null) {
  return false;
 }
 for (int i = 0, len = s.length(); i < len; i++) {
  if (Character.isLetter(s.charAt(i)) || Character.isDigit(s.charAt(i))) {
   return true;
  }
 }
 return false;
}

代码示例来源：origin: alibaba/druid

static String clean(String str) {
  if (str == null || str.length() == 0) {
    return str;
  }
  int len = str.length();
  char[] chars = new char[len];
  int count = 0;
  for (int i = 0; i < len; i++) {
    if (Character.isLetter(str.charAt(i))) {
      chars[count++] = str.charAt(i);
    }
  }
  if (count == len) {
    return str.toUpperCase(java.util.Locale.ENGLISH);
  }
  return new String(chars, 0, count).toUpperCase(java.util.Locale.ENGLISH);
}

代码示例来源：origin: apache/incubator-dubbo

public List<URL> getCacheUrls(URL url) {
  for (Map.Entry<Object, Object> entry : properties.entrySet()) {
    String key = (String) entry.getKey();
    String value = (String) entry.getValue();
    if (key != null && key.length() > 0 && key.equals(url.getServiceKey())
        && (Character.isLetter(key.charAt(0)) || key.charAt(0) == '_')
        && value != null && value.length() > 0) {
      String[] arr = value.trim().split(URL_SPLIT);
      List<URL> urls = new ArrayList<>();
      for (String u : arr) {
        urls.add(URL.valueOf(u));
      }
      return urls;
    }
  }
  return null;
}

代码示例来源：origin: apache/incubator-dubbo

public List<URL> getCacheUrls(URL url) {
  for (Map.Entry<Object, Object> entry : properties.entrySet()) {
    String key = (String) entry.getKey();
    String value = (String) entry.getValue();
    if (key != null && key.length() > 0 && key.equals(url.getServiceKey())
        && (Character.isLetter(key.charAt(0)) || key.charAt(0) == '_')
        && value != null && value.length() > 0) {
      String[] arr = value.trim().split(URL_SPLIT);
      List<URL> urls = new ArrayList<>();
      for (String u : arr) {
        urls.add(URL.valueOf(u));
      }
      return urls;
    }
  }
  return null;
}

代码示例来源：origin: go-lang-plugin-org/go-lang-idea-plugin

private static boolean checkPrefix(@Nullable String name, @NotNull String prefix) {
  // https://github.com/golang/go/blob/master/src/cmd/go/test.go#L1161 – isTest()
  if (name == null || !name.startsWith(prefix)) return false;
  if (prefix.length() == name.length()) return true;
  char c = name.charAt(prefix.length());
  return !Character.isLetter(c) || !Character.isLowerCase(c);
 }
}

代码示例来源：origin: google/guava

@Override
 protected int nextEscapeIndex(CharSequence csq, int index, int end) {
  while (index < end && !Character.isLetter(csq.charAt(index))) {
   index++;
  }
  return index;
 }
};

代码示例来源：origin: lets-blade/blade

private static void validateParamChar(char cc, int idx) {
    if (!(isDigit(cc) || isLetter(cc) || '.' == cc))
      throw UncheckedTemplateException.invalidCharacterInParam(cc, idx);
  }
}

代码示例来源：origin: lets-blade/blade

private static void validateParamChar(char cc, int idx) {
    if (!(isDigit(cc) || isLetter(cc) || '.' == cc))
      throw UncheckedTemplateException.invalidCharacterInParam(cc, idx);
  }
}

代码示例来源：origin: checkstyle/checkstyle

private boolean START_sempred(RuleContext _localctx, int predIndex) {
  switch (predIndex) {
  case 4:
    return recognizeXmlTags && (Character.isLetter(_input.LA(1)) || _input.LA(1) == '/');
  }
  return true;
}
private boolean AUTHOR_LITERAL_sempred(RuleContext _localctx, int predIndex) {

代码示例来源：origin: alibaba/fastjson

public final void nextIdent() {
  while (isWhitespace(ch)) {
    next();
  }
  if (ch == '_' || ch == '$' || Character.isLetter(ch)) {
    scanIdent();
  } else {
    nextToken();
  }
}