Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Locale;

public class Main {
    /**
     * @param str str
     * @return String
     */
    public static String capitalizeFirstLetter(String str) {

        if (isEmpty(str)) {
            return str;
        }

        char c = str.charAt(0);
        return (!Character.isLetter(c) || Character.isUpperCase(c)) ? str
                : new StringBuilder(str.length()).append(Character.toUpperCase(c)).append(str.substring(1))
                        .toString();
    }

    /**
     * is null or its length is 0
     * <p/>
     * <pre>
     * isEmpty(null) = true;
     * isEmpty(&quot;&quot;) = true;
     * isEmpty(&quot;  &quot;) = false;
     * </pre>
     *
     * @param str str
     * @return if string is null or its size is 0, return true, else return
     * false.
     */
    public static boolean isEmpty(CharSequence str) {

        return (str == null || str.length() == 0);
    }

    public static boolean isEmpty(String string) {
        return string == null || "".equals(string.trim());
    }

    public static boolean isEmpty(String... strings) {
        boolean result = true;
        for (String string : strings) {
            if (isNotEmpty(string)) {
                result = false;
                break;
            }
        }
        return result;
    }

    /**
     * get length of CharSequence
     * <p/>
     * <pre>
     * length(null) = 0;
     * length(\"\") = 0;
     * length(\"abc\") = 3;
     * </pre>
     *
     * @param str str
     * @return if str is null or empty, return 0, else return {@link
     * CharSequence#length()}.
     */
    public static int length(CharSequence str) {

        return str == null ? 0 : str.length();
    }

    public static String toUpperCase(String str, int beginIndex, int endIndex) {
        return str.replaceFirst(str.substring(beginIndex, endIndex),
                str.substring(beginIndex, endIndex).toUpperCase(Locale.getDefault()));
    }

    public static boolean isNotEmpty(String string) {
        return !isEmpty(string);
    }

    public static boolean isNotEmpty(String... strings) {
        boolean result = true;
        for (String string : strings) {
            if (isEmpty(string)) {
                result = false;
                break;
            }
        }
        return result;
    }
}