Debugging console input using NetBeans

Question

Is there a way in NetBeans that while you are debugging a Java program to modify or check the value that a function or variable returns. The same way you can use the console in Matlab.

I'm not speaking about the usual debugging tools variable windows etc.

Example I want to break at a method in car class and input

>car.getMileage()

and get..

>car.getMileage()
>2500

or

>car.setMileage(100)
>car.getMileage()
>100

Java is not entirely an interpreted language so this probably doesn't exist. — Zong
– Zong, Commented May 1, 2014 at 20:32

Mark W · Accepted Answer · 2014-05-01 20:54:49Z

5

In Netbeans there is a tab under your source code window (there by default I think) called Variables. In that window you can edit the Value field of any variable that is in scope while suspended at a breakpoint. This value should update for the java application as you change it in real time. You can invoke methods the same way, by adding a watch. Like say you had a static method getInt(); which returns some value. Just make a watch for getInt(), and the Value column will show you the return value. So for your example, make a watch for car.setMileage(100) after your breakpoint is hit. The value column will likely be 'void'. Then make another watch for car.getMileage(). 100 should be returned.

edited May 1, 2014 at 20:54

answered May 1, 2014 at 20:42

Mark W

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1 Comment

Zon Over a year ago

+1 I use it as well. But general demand is in a more convenient way - like Chrome Javascript Console. Netbeans Console unfortunately allows typing, not code execution.

user2591612 · Accepted Answer · 2014-05-01 20:34:07Z

1

Use an IDE such as Eclipse. You can set breakpoints, set statements and execute them. This is a feature of most modern IDEs actually.

More info on the display view can be found here : http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/views/debug/ref-debug_view.htm

For a nice overview of the debugging features of Eclipse, check out this post : http://www.cavdar.net/2008/09/13/5-tips-for-debugging-java-code-in-eclipse/

answered May 1, 2014 at 20:34

user2591612

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