Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    private static final String PATTERN = "^[A-Za-z0-9]+$";
    private static final String SHARP = "#";

    public static String getFirst(String pinyin) {
        if (pinyin == null || pinyin.length() < 1) {
            return SHARP;
        }
        String fistLetter = pinyin.substring(0, 1);
        if (!fistLetter.matches(PATTERN)) {
            return SHARP;
        }
        return fistLetter;
    }
}