Learning Java Programming on Linux

[Homework]

Hello, I'm new to Linux Lite OS and programming.
At the moment, I'm learning Java programming from a course at Udemy and I've encountered a problem with empty spaces in outputs.

Here's part of the codes:

Code:

public String toString()   
{
        return first + " " + middle + " " + last;   
}

Name myName = new Name("Cookie" + "Monster" + "Jr");
System.out.println("myName: " + myName.toString());

Then I compiled the codes and here's what it's shown on the Terminal:

Code:

mei@mei-Aspire-4750:~/Documents/java$ javac NameTest.java
mei@mei-Aspire-4750:~/Documents/java$ javac Name.java
mei@mei-Aspire-4750:~/Documents/java$ java NameTest
myName:   CookieMonsterJr

All the spaces are appearing right before the name. I'm using Linux's Text Editor. Could this the reason why the codes are not working properly?