Is there any way to debug only specific code or method of one of the class in an application without executing entire code from main method. One way would be writing junit for that class and debugging it with break point.Is there any there way?
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You can write your own driver but why?PM 77-1– PM 77-12018-07-31 15:07:10 +00:00Commented Jul 31, 2018 at 15:07
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2The only way and the right way are unit/integration testsHerr Derb– Herr Derb2018-07-31 15:10:57 +00:00Commented Jul 31, 2018 at 15:10
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3 Answers
You can have multiple main methods in your project - one in every class. If you wan't to debug some code in a specific class only, you can add a main method to that class and execute only the desired code. For launching your program, you can use your "main main method" again.
Note: in fact this is kind of similar to a JUnit test, except that you control everything and are not bound to the JUnit structure/syntax/etc.
Note 2: maybe you need to do some setup like in JUnit, too, if your class to be debugged relies on other parts of the project.
Comments
You can run the HelloWorld.java in any package as you want as long as there is an entry, which is the public static void main(String[] args):
public class HelloWorld {
public static void main(String... args) {
System.out.println("Hello world");
}
}
By the way, normally we will have a main for each class for unit test as you mentioned, which provides us more power to do the job without any dependency and side effects.
4 Comments
Dia S
In my application there is only one main class and many packages, independent classes and methods which are called internally and I want to debug only those newly created/updated methods instead of running whole application.
Hearen
@DiaS Using maven or something similar? How about creating an entry and put your newly added methods there and right click that entry file and select the debug item?
Dia S
Creating entry point will be like adding main method in that class right.
Dia S
That is not intended.I just wanted to check the flow of my new code.So it is better to write Junit and execute n debug mode.
There is no way to debug your class without entrypoint (junit also have entrypoint). Java entrypoint is method Main.
7 Comments
Gatusko
Not Always. You can set an static method and run only the class with a static method.
Arnaud Denoyelle
@Gatusko Are you sure about that? Can you do that from the command line or is it a feature provided by your IDE? (which could in this case create a class with a main method on the fly)
gtgaxiola
I'll interject that it was possible with Java 6 but not anymore See this answer
Alexander Ozertsov
@Gatusko How could you run static method without any entrypoint??
Gatusko
@AlexanderOzertsov as metioned before. There a lot of ways in Java 6. In Java 8 you can do workarounds. Like adding as JavaFX Application, just try to do a search for it and you will see there are people that do it. But you can do it.
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