Java String Upper Case toUpperCaseAt(String oldString, int index)

Description

Replace character at given index with the same character to upper case

License

Open Source License

Parameter

Parameter	Description
oldString	old string
index	of replacement

Return

String new string

Declaration

public static String toUpperCaseAt(String oldString, int index)
        throws NullPointerException, StringIndexOutOfBoundsException 

Method Source Code

//package com.java2s;
/*/*w w  w . j av  a 2s.c  om*/
 * RHQ Management Platform
 * Copyright (C) 2005-2008 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

public class Main {
    /**
     * Replace character at given index with the same character to upper case
     *
     * @param     oldString old string
     * @param     index     of replacement
     *
     * @return    String new string
     *
     * @exception StringIndexOutOfBoundsException  
     */
    public static String toUpperCaseAt(String oldString, int index)
            throws NullPointerException, StringIndexOutOfBoundsException {
        int length = oldString.length();
        String newString = "";

        if ((index >= length) || (index < 0)) {
            throw new StringIndexOutOfBoundsException("Index " + index
                    + " is out of bounds for string length " + length);
        }

        //get upper case replacement
        String upper = String.valueOf(oldString.charAt(index))
                .toUpperCase();

        //avoid index out of bounds
        String paddedString = oldString + " ";

        //get reusable parts
        String beforeIndex = paddedString.substring(0, index);
        String afterIndex = paddedString.substring(index + 1);

        //generate new String - remove padding spaces
        newString = (beforeIndex + upper + afterIndex).substring(0, length);

        return newString;
    }
}

Related

1. toUpperCase(String[] source)
2. toUpperCase(StringBuffer buf)
3. toUppercaseAndUnderscore(String string)
4. toUpperCaseArray(String[] source, String[] target)
5. toUpperCaseAscii(String s)
6. toUpperCaseAtFirstChar(String string)
7. toUpperCaseFirst(String str)
8. toUpperCaseFirst(String str)
9. toUpperCaseFirst(String str)