Java String Capitalize capitalize(String line)

Description

capitalize

License

Open Source License

Declaration

public static String capitalize(String line) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2009 Andrey Loskutov.//from   w ww.  j  av  a  2  s  .c  o m
 * 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
 * Contributor:  Andrey Loskutov - initial API and implementation
 *******************************************************************************/

public class Main {
    public static String capitalize(String line) {
        StringBuffer sb = new StringBuffer(line);
        int size = line.length();
        boolean changed = false;
        char c;
        int lastWordIdx = 0;
        for (int i = 0; i < size; i++) {
            i = indexOfNextWord(line, i, lastWordIdx);
            if (i < 0) {
                break;
            }
            c = line.charAt(i);
            if (Character.isLowerCase(c)) {
                c = Character.toUpperCase(c);
                sb.setCharAt(i, c);
                changed = true;
            }
            lastWordIdx = i;
        }
        if (changed) {
            return new String(sb);
        }
        return line;
    }

    /**
     * get index of first non-whitespace letter (one of " \t\r\n")
     * @return -1 if no such (non-whitespace) character found from given
     * startOffset (inclusive)
     */
    private static int indexOfNextWord(String line, int startOffset, int lastIdx) {
        int size = line.length();
        char c;
        boolean continueSequence = lastIdx + 1 == startOffset;
        for (int i = startOffset; i < size; i++) {
            c = line.charAt(i);
            if (Character.isWhitespace(c)) {
                continueSequence = false;
                continue;
            } else if (continueSequence) {
                continue;
            }
            return i;
        }
        return -1;
    }
}

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