How to declare default call variables in a sub

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In C# i can write a sub like

C#

public void example(Boolean closeControlOnFinish = true){
}

Where closeControlOnFinish is by default true so i can call example(); without having to call example(true);.

How do I replicate this in java? The following doesn't work. Additionally note that the code is in public class Download extends

Java

java.awt.Panel.

public Download(Boolean closeControlOnFinish = true) {
}

Posted 9-May-12 7:13am

A-s-h-l-e-y

Updated 9-May-12 7:36am

Sandeep Mewara

v3

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-05-09T08:10:00

Solution 1

There is no exact same feature in Java, and even if C# it was introduced in v.4.

For a reasonable work-around, take a look at this answer:
http://stackoverflow.com/questions/965690/java-optional-parameters[^].

—SA

Posted 9-May-12 8:10am

Sergey Alexandrovich Kryukov

Comments

A-s-h-l-e-y 9-May-12 15:32pm

So is there a way i can use public Download(Boolean closeControlOnFinish) {
}
and still call it by just Download(); ?
then use if null closeControlOnFinish=true.
currently net beans just gives an error preventing this

Sergey Alexandrovich Kryukov 9-May-12 17:18pm

There is nothing preventing it. You must be doing something else wrong. No, you did not get it. You don't "still call" the same method without parameter; you have to define two (or more) methods with different parameter sets (signatures) but the same name. They are different methods. One can call another one.
--SA

A-s-h-l-e-y 9-May-12 22:30pm

I see i can switch out using a 3rd sub and a global so i don't require the passing of the variable locally. Thanks :).

Sergey Alexandrovich Kryukov 9-May-12 23:41pm

You are welcome.
--SA