Java String Upper Case toUpperCase(final String s)

Description

Retrieves an all-uppercase version of the provided string.

License

Open Source License

Parameter

Parameter	Description
s	The string for which to retrieve the uppercase version.

Return

An all-uppercase version of the provided string.

Declaration

public static String toUpperCase(final String s) 

Method Source Code

//package com.java2s;
/*//w  ww .  ja  va 2s .c om
 * Copyright (C) 2008-2018 Ping Identity Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses>.
 */

public class Main {
    /**
     * Retrieves an all-uppercase version of the provided string.
     *
     * @param  s  The string for which to retrieve the uppercase version.
     *
     * @return  An all-uppercase version of the provided string.
     */
    public static String toUpperCase(final String s) {
        if (s == null) {
            return null;
        }

        final int length = s.length();
        final char[] charArray = s.toCharArray();
        for (int i = 0; i < length; i++) {
            switch (charArray[i]) {
            case 'a':
                charArray[i] = 'A';
                break;
            case 'b':
                charArray[i] = 'B';
                break;
            case 'c':
                charArray[i] = 'C';
                break;
            case 'd':
                charArray[i] = 'D';
                break;
            case 'e':
                charArray[i] = 'E';
                break;
            case 'f':
                charArray[i] = 'F';
                break;
            case 'g':
                charArray[i] = 'G';
                break;
            case 'h':
                charArray[i] = 'H';
                break;
            case 'i':
                charArray[i] = 'I';
                break;
            case 'j':
                charArray[i] = 'J';
                break;
            case 'k':
                charArray[i] = 'K';
                break;
            case 'l':
                charArray[i] = 'L';
                break;
            case 'm':
                charArray[i] = 'M';
                break;
            case 'n':
                charArray[i] = 'N';
                break;
            case 'o':
                charArray[i] = 'O';
                break;
            case 'p':
                charArray[i] = 'P';
                break;
            case 'q':
                charArray[i] = 'Q';
                break;
            case 'r':
                charArray[i] = 'R';
                break;
            case 's':
                charArray[i] = 'S';
                break;
            case 't':
                charArray[i] = 'T';
                break;
            case 'u':
                charArray[i] = 'U';
                break;
            case 'v':
                charArray[i] = 'V';
                break;
            case 'w':
                charArray[i] = 'W';
                break;
            case 'x':
                charArray[i] = 'X';
                break;
            case 'y':
                charArray[i] = 'Y';
                break;
            case 'z':
                charArray[i] = 'Z';
                break;
            default:
                if (charArray[i] > 0x7F) {
                    return s.toUpperCase();
                }
                break;
            }
        }

        return new String(charArray);
    }
}

Related

1. toUpperCase(CharSequence string)
2. toUpperCase(final char c)
3. toUpperCase(final String s)
4. toUpperCase(final String s)
5. toUpperCase(final StringBuilder src)
6. toUpperCase(String candidate)