implements CharSequence : String vs Char Array « Data Type « Java Tutorial

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Java Tutorial » Data Type » String vs Char Array 
2. 28. 13. implements CharSequence
/*******************************************************************************
 * Copyright (c) 2008 xored software, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     xored software, Inc. - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/


/**
 {@link CharSequence} implementation backing by the char[]
 */
public class CharArraySequence implements CharSequence {

  private final char[] buff;
  private final int offset;
  private final int count;

  /**
   @param buff
   */
  public CharArraySequence(char[] buff) {
    this(buff, 0, buff.length);
  }

  /**
   @param buff
   @param count
   */
  public CharArraySequence(char[] buff, int count) {
    this(buff, 0, count);
  }

  /**
   @param buff
   @param offset
   @param count
   */
  public CharArraySequence(char[] buff, int offset, int count) {
    this.buff = buff;
    this.offset = offset;
    this.count = count;
  }

  /*
   * @see java.lang.CharSequence#charAt(int)
   */
  public char charAt(int index) {
    if (index < || index >= count) {
      throw new StringIndexOutOfBoundsException(index);
    }
    return buff[offset + index];
  }

  /*
   * @see java.lang.CharSequence#length()
   */
  public int length() {
    return count;
  }

  /*
   * @see java.lang.CharSequence#subSequence(int, int)
   */
  public CharSequence subSequence(int beginIndex, int endIndex) {
    if (beginIndex < 0) {
      throw new StringIndexOutOfBoundsException(beginIndex);
    }
    if (endIndex > count) {
      throw new StringIndexOutOfBoundsException(endIndex);
    }
    if (beginIndex > endIndex) {
      throw new StringIndexOutOfBoundsException(endIndex - beginIndex);
    }
    return ((beginIndex == 0&& (endIndex == count)) this
        new CharArraySequence(buff, offset + beginIndex, endIndex
            - beginIndex);
  }

  public String toString() {
    return new String(this.buff, this.offset, this.count);
  }
}
2. 28. String vs Char Array
2. 28. 1. Demonstrates the charAt and getChars
2. 28. 2. Converting Char array to String
2. 28. 3. Creating Character Arrays From String Objects
2. 28. 4. Copy characters from string into char Array
2. 28. 5. Creating String Objects From Character Arrays
2. 28. 6. new String(textArray, 9, 3): Creating String Objects From certain part of a character Array
2. 28. 7. Creating String Objects From Character Arrays using String.copyValueOf()
2. 28. 8. Creating a string from a subset of the array elements
2. 28. 9. Extracting a substring as an array of characters using the method getChars()
2. 28. 10. Using the Collection-Based for Loop with a String: Counting all vowels in a string
2. 28. 11. Construct one String from another.
2. 28. 12. demonstrates getChars( ):
2. 28. 13. implements CharSequence
2. 28. 14. Removes spaces (char <= 32) from end of this String with escape, handling null by returning null
2. 28. 15. Removes spaces (char <= 32) from end of this String, handling null by returning null
2. 28. 16. Swaps the case of a String changing upper and title case to lower case, and lower case to upper case.
2. 28. 17. Deletes all whitespaces from a String as defined by Character.isWhitespace(char).
2. 28. 18. Checks whether the String contains only digit characters.
2. 28. 19. Checks that the String does not contain certain characters.
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