java - Name Reversing in strings -

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write method lastnamefirst takes string containing name such "harry smith" or "mary jane lee", , returns string last name first, such "smith, harry" or "lee, mary jane".

im supposed check against http://wiley.code-check.org/codecheck/files?repo=bjlo2&problem=05_02

i post 

    string firstname = name.substring(0, name.indexof(" "));     string lastname = name.substring(name.indexof(" "));      string cname =  lastname + ", " + firstname;     if ( lastname == " "  )     {        cname = firstname;      }     return cname;

i 0/4 everytime please im lost.

it might simpler create array using split function of string class, join them:

string cname = string.join(", ", collections.reverse(arrays.aslist(name.split(" "))));

string.join in java 8 believe, if you're not using 8 can use following:

string[] names = name.split(" "); string cname = names[1] + ", " + names[0];

you should using equals method comparing string , other objects:

string[] names = name.split(" "); string cname = names[1].equals(" ") ? names[0] : names[1] + ", " + names[0];

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