Center the contents of the string. : String format « Data Type « Java






  1. Java
  2. Data Type
  3. String format

Center the contents of the string.

        
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
 * JBoss DNA (http://www.jboss.org/dna)
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * See the AUTHORS.txt file in the distribution for a full listing of 
 * individual contributors.
 *
 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
 * is licensed to you under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * JBoss DNA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

/**
 * Utilities for string processing and manipulation.
 */
public class StringUtil {


  /**
   * Center the contents of the string. If the supplied string is longer than the desired width, it is truncated to the
   * specified length. If the supplied string is shorter than the desired width, padding characters are added to the beginning
   * and end of the string such that the length is that specified; one additional padding character is prepended if required.
   * All leading and trailing whitespace is removed before centering.
   * 
   * @param str the string to be left justified; if null, an empty string is used
   * @param width the desired width of the string; must be positive
   * @param padWithChar the character to use for padding, if needed
   * @return the left justified string
   * @see #setLength(String, int, char)
   */
  public static String justifyCenter( String str,
                                      final int width,
                                      char padWithChar ) {
      // Trim the leading and trailing whitespace ...
      str = str != null ? str.trim() : "";

      int addChars = width - str.length();
      if (addChars < 0) {
          // truncate
          return str.subSequence(0, width).toString();
      }
      // Write the content ...
      int prependNumber = addChars / 2;
      int appendNumber = prependNumber;
      if ((prependNumber + appendNumber) != addChars) {
          ++prependNumber;
      }

      final StringBuilder sb = new StringBuilder();

      // Prepend the pad character(s) ...
      while (prependNumber > 0) {
          sb.append(padWithChar);
          --prependNumber;
      }

      // Add the actual content
      sb.append(str);

      // Append the pad character(s) ...
      while (appendNumber > 0) {
          sb.append(padWithChar);
          --appendNumber;
      }

      return sb.toString();
  }

}








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