本文整理了Java中java.lang.CharSequence.charAt()方法的一些代码示例，展示了CharSequence.charAt()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。CharSequence.charAt()方法的具体详情如下：
包路径：java.lang.CharSequence
类名称：CharSequence
方法名：charAt

CharSequence.charAt介绍

[英]Returns the character at the specified index, with the first character having index zero.
[中]返回指定索引处的字符，第一个字符的索引为零。

代码示例

代码示例来源：origin: google/guava

@Override
protected final int nextEscapeIndex(CharSequence csq, int index, int end) {
 while (index < end) {
  char c = csq.charAt(index);
  if ((c < replacementsLength && replacements[c] != null)
    || c > safeMaxChar
    || c < safeMinChar) {
   break;
  }
  index++;
 }
 return index;
}

代码示例来源：origin: google/guava

@Override
protected int nextEscapeIndex(CharSequence csq, int index, int end) {
 checkNotNull(csq);
 for (; index < end; index++) {
  char c = csq.charAt(index);
  if (c >= safeOctets.length || !safeOctets[c]) {
   break;
  }
 }
 return index;
}

代码示例来源：origin: netty/netty

/**
 * Determine if the string {@code s} ends with the char {@code c}.
 *
 * @param s the string to test
 * @param c the tested char
 * @return true if {@code s} ends with the char {@code c}
 */
public static boolean endsWith(CharSequence s, char c) {
  int len = s.length();
  return len > 0 && s.charAt(len - 1) == c;
}

代码示例来源：origin: google/guava

/**
 * True when a valid surrogate pair starts at the given {@code index} in the given {@code string}.
 * Out-of-range indexes return false.
 */
@VisibleForTesting
static boolean validSurrogatePairAt(CharSequence string, int index) {
 return index >= 0
   && index <= (string.length() - 2)
   && Character.isHighSurrogate(string.charAt(index))
   && Character.isLowSurrogate(string.charAt(index + 1));
}

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

private static boolean containsText(CharSequence str) {
  int strLen = str.length();
  for (int i = 0; i < strLen; i++) {
    if (!Character.isWhitespace(str.charAt(i))) {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: ReactiveX/RxJava

public static int lineNumber(CharSequence s, int index) {
  int cnt = 1;
  for (int i = 0; i < index; i++) {
    if (s.charAt(i) == '\n') {
      cnt++;
    }
  }
  return cnt;
}

代码示例来源：origin: google/guava

@Override
public boolean canDecode(CharSequence chars) {
 StringBuilder builder = new StringBuilder();
 for (int i = 0; i < chars.length(); i++) {
  char c = chars.charAt(i);
  if (separator.indexOf(c) < 0) {
   builder.append(c);
  }
 }
 return delegate.canDecode(builder);
}

代码示例来源：origin: google/guava

@Override
public HashCode hashUnencodedChars(CharSequence input) {
 int len = input.length();
 ByteBuffer buffer = ByteBuffer.allocate(len * 2).order(ByteOrder.LITTLE_ENDIAN);
 for (int i = 0; i < len; i++) {
  buffer.putChar(input.charAt(i));
 }
 return hashBytes(buffer.array());
}

代码示例来源：origin: google/guava

@Override
public Hasher putUnencodedChars(CharSequence charSequence) {
 for (int i = 0, len = charSequence.length(); i < len; i++) {
  putChar(charSequence.charAt(i));
 }
 return this;
}

代码示例来源：origin: google/guava

@Override
int decodeTo(byte[] target, CharSequence chars) throws DecodingException {
 StringBuilder stripped = new StringBuilder(chars.length());
 for (int i = 0; i < chars.length(); i++) {
  char c = chars.charAt(i);
  if (separator.indexOf(c) < 0) {
   stripped.append(c);
  }
 }
 return delegate.decodeTo(target, stripped);
}

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

public char charAt(int index) {
  this.access.check();
  return this.value.charAt(index);
}

代码示例来源：origin: google/guava

/**
 * Returns the number of matching {@code char}s found in a character sequence.
 *
 * <p>Counts 2 per supplementary character, such as for {@link #whitespace}().{@link #negate}().
 */
public int countIn(CharSequence sequence) {
 int count = 0;
 for (int i = 0; i < sequence.length(); i++) {
  if (matches(sequence.charAt(i))) {
   count++;
  }
 }
 return count;
}

代码示例来源：origin: google/guava

@Override
int decodeTo(byte[] target, CharSequence chars) throws DecodingException {
 checkNotNull(target);
 if (chars.length() % 2 == 1) {
  throw new DecodingException("Invalid input length " + chars.length());
 }
 int bytesWritten = 0;
 for (int i = 0; i < chars.length(); i += 2) {
  int decoded = alphabet.decode(chars.charAt(i)) << 4 | alphabet.decode(chars.charAt(i + 1));
  target[bytesWritten++] = (byte) decoded;
 }
 return bytesWritten;
}

代码示例来源：origin: google/guava

@Override
 public boolean apply(CharSequence input) {
  return (input.length() > 0) && (input.charAt(0) == 'a');
 }
};

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: google/guava

@Override
public synchronized int read(CharBuffer target) throws IOException {
 checkNotNull(target);
 checkOpen();
 if (!hasRemaining()) {
  return -1;
 }
 int charsToRead = Math.min(target.remaining(), remaining());
 for (int i = 0; i < charsToRead; i++) {
  target.put(seq.charAt(pos++));
 }
 return charsToRead;
}

代码示例来源：origin: google/guava

@Override
public synchronized int read() throws IOException {
 checkOpen();
 return hasRemaining() ? seq.charAt(pos++) : -1;
}

代码示例来源：origin: google/guava

@Override
public Character get(int index) {
 checkElementIndex(index, size()); // for GWT
 return sequence.charAt(index);
}

代码示例来源：origin: google/guava

@Override
public boolean canDecode(CharSequence chars) {
 checkNotNull(chars);
 chars = trimTrailingPadding(chars);
 if (!alphabet.isValidPaddingStartPosition(chars.length())) {
  return false;
 }
 for (int i = 0; i < chars.length(); i++) {
  if (!alphabet.canDecode(chars.charAt(i))) {
   return false;
  }
 }
 return true;
}

代码示例来源：origin: google/guava

@Override
public synchronized int read(char[] cbuf, int off, int len) throws IOException {
 checkPositionIndexes(off, off + len, cbuf.length);
 checkOpen();
 if (!hasRemaining()) {
  return -1;
 }
 int charsToRead = Math.min(len, remaining());
 for (int i = 0; i < charsToRead; i++) {
  cbuf[off + i] = seq.charAt(pos++);
 }
 return charsToRead;
}