Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
 * to you 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 {
    /**
     * <p>
     * Swaps the case of String.
     * </p>
     * <p/>
     * <p>
     * Properly looks after making sure the start of words are Titlecase and not Uppercase.
     * </p>
     * <p/>
     * <p>
     * <code>null</code> is returned as <code>null</code>.
     * </p>
     *
     * @param str the String to swap the case of
     * @return the modified String
     */
    public static String swapCase(String str) {
        if (str == null) {
            return null;
        }
        int sz = str.length();
        StringBuilder buffer = new StringBuilder(sz);

        boolean whitespace = false;
        char ch;
        char tmp;

        for (int i = 0; i < sz; i++) {
            ch = str.charAt(i);
            if (Character.isUpperCase(ch)) {
                tmp = Character.toLowerCase(ch);
            } else if (Character.isTitleCase(ch)) {
                tmp = Character.toLowerCase(ch);
            } else if (Character.isLowerCase(ch)) {
                if (whitespace) {
                    tmp = Character.toTitleCase(ch);
                } else {
                    tmp = Character.toUpperCase(ch);
                }
            } else {
                tmp = ch;
            }
            buffer.append(tmp);
            whitespace = Character.isWhitespace(ch);
        }
        return buffer.toString();
    }

    /**
     * <p>
     * Checks if the String contains only whitespace.
     * </p>
     * <p/>
     * <p>
     * <code>null</code> will return <code>false</code>. An empty String will return <code>true</code>.
     * </p>
     *
     * @param str the String to check
     * @return <code>true</code> if only contains whitespace, and is non-null
     */
    public static boolean isWhitespace(String str) {
        if (str == null) {
            return false;
        }
        int sz = str.length();
        for (int i = 0; i < sz; i++) {
            if ((Character.isWhitespace(str.charAt(i)) == false)) {
                return false;
            }
        }
        return true;
    }
}