Here you can find the source of capitalize(String s)
Parameter | Description |
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s | the string whose first character is to be uppercased |
Parameter | Description |
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NullPointerException | if <tt>s</tt> is null |
public static String capitalize(String s)
//package com.java2s; /**//from www . j ava 2 s .c o m * Copyright (c) 2000, Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { /** * Returns a string that is equivalent to the specified string with its * first character converted to uppercase as by {@link String#toUpperCase()}. * The returned string will have the same value as the specified string if * its first character is non-alphabetic, if its first character is already * uppercase, or if the specified string is of length 0. * * <p>For example: * <pre> * capitalize("foo bar").equals("Foo bar"); * capitalize("2b or not 2b").equals("2b or not 2b") * capitalize("Foo bar").equals("Foo bar"); * capitalize("").equals(""); * </pre> * * @param s the string whose first character is to be uppercased * @return a string equivalent to <tt>s</tt> with its first character * converted to uppercase * @throws NullPointerException if <tt>s</tt> is null */ public static String capitalize(String s) { if (s.length() == 0) { return s; } char first = s.charAt(0); char capitalized = Character.toUpperCase(first); return (first == capitalized) ? s : capitalized + s.substring(1); } /** * Safely convert the string to uppercase. * @return upper case representation of the String; or null if * the input string is null. */ public static String toUpperCase(String src) { if (src == null) { return null; } else { return src.toUpperCase(); } } }