Java - Write code to return default value If string is Null

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Requirements

Write code to return default value If string is Null

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String str = "book2s.com";
        System.out.println(defaultIfNull(str));
    }//from  ww w .  j  a va  2  s.c o m

    public static final String EMPTY_STRING = "";

    public static String defaultIfNull(String str) {
        return (str == null) ? EMPTY_STRING : str;
    }

    public static String defaultIfNull(String str, String defaultStr) {
        return (str == null) ? defaultStr : str;
    }
}