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Java Do While Loops

Posted by veronikapost
veronikapost
2,552 Points

Instance creation: console vs. luck

Hi Everyone! I find this small workshop about Java loops very helpful, so thank you for putting it together Treehouse and Craig. I have a question about the instance creation in our MiniGolf example. Here is the original code that Craig wrote:

Console console = System.console();
Random luck = new Random();

However, why the creation of console instance is so different? Why we are creating it through the System class, and not through the new keyword like this?:

Console console = new Console();
Bob Allan
Bob Allan
10,900 Points
Bob Allan
Bob Allan
10,900 Points

That is a really great question Veronika Post, I would like to know the answer to that myself. It might help if we tag Craig Dennis, just to get his attention. :)

2 Answers

Craig Dennis
STAFF
Craig Dennis
Treehouse Teacher
Craig Dennis
Craig Dennis
Treehouse Teacher

Excellent question Veronika Post (and thanks for the tag Bob Allan !)

System.console() is a static method that gets a hold of an already created console object. There is only one available (also known as a Singleton). Somewhere behind the scenes the System class is using an instance that was created using the new keyword.

However the System.console static method returns that instance (if it exists).

veronikapost
veronikapost
2,552 Points
veronikapost
veronikapost
2,552 Points

Thank you very much, Craig Dennis and Bob Allan! I appreciate the help from you both. I did quite a lot of extra reading, and understood how static methods work, and also that I have to create a new console object using System.console() method, seems that I cannot do it through Console class constructor because the constructor is private. But can I ask you why there is no option of creating it through the constructor? I'm sure there is a reason for that, and I am probably running way to ahead of the current workshop, but I was just curious. Anyway, thank you both for your time.