Top 100+ The Java Debugger (jdb) Interview Questions And Answers
Question 1. What Is (jdb) Java Debugger?
Answer :
(JDB) Java debugger is a command line Java debugging tool used to debug Java packages without the requirement of inserting precise debugging commands into the code.
Question 2. What Are The Advantages Of Java Debugger?
Answer :
These are some advantages of Java Debugger: -
It is a lightweight debugging tool.
It is loose to apply and to be had for all type of running structures.
The execution of Java debugging tool is very speedy.
It provide guide for multithreaded packages and faraway packages.
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Question 3. What Are Some Frequently Generate Bugs?
Answer :
These are a few generally generate bugs: -
Syntactic or Compilation mistakes - These mistakes are usually generated because of a few typing errors.
Run-time errors - These mistakes are generated at execution time commonly due to exceptions.
Threading mistakes - These mistakes are tough to replicate and song down.
Question 4. What Are The Different Approaches Of Debugging?
Answer :
Various forms of methods used for debugging are: -
Optimized code debugging
Using comments
Basic Java bytecode (by using the usage of System.Out.Println() )
Remote Debugging
Debugging on call for
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Question 5. How To Connect Jdbc With Java?
Answer :
There are numerous methods to attach JDBC with JAVA but the simplest one is to provide the subsequent command on the runtime of your primary class:-
>jdbc Main Class
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Question 6. What Is The Role Of Interpreter In Debugging The Java Program?
Answer :
Java debugger interacts with the Java runtime interpreter to break the regular drift of application. Thus, Java interpreter presents aid to debugger.
Question 7. What Is The Syntax Used To Invoke The Debugger?
Answer :
The following syntax is required to invoke debugger: -
jdb [options] [classname] [arguments]
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Question 8. How Can We Debug An Applet?
Answer :
To debug an applet we must execute the debugger within applet viewer by the assist of following command: -
>appletviewer -debug URL
Question nine. How Can We Start The Execution Of Main Class?
Answer :
To begin the execution of principal class you simply want to execute the underneath command: -
>run [class [args]]
It is optionally available to mention the call of precise class and argument.
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Question 10. Which Command Is Used To Complete The Remaining Execution?
Answer :
Use the subsequent command to complete the partial execution of application: -
>cont
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Question 11. What Is The Difference Between Print And Dump Command?
Answer :
The print command is used to display the fee of expressions while dump command is used to display the information of objects.
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Question 12. What Is The Purpose Of Breakpoints In Java Debugger?
Answer :
Breakpoints are used in debugging to pause or stop the execution of a program at a specific line of code and test whether the program is functioning efficaciously or now not.
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Question 13. What Is The Syntax Used To Set A Breakpoint?
Answer :
A breakpoint may be set both on the idea of approach call or specific variety of line.
To set a breakpoint on method, the following syntax is used: -
forestall in Classname.MethodName
To set a breakpoint on unique line, the subsequent syntax is used: -
stop at Classname:LineNumber
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Question 14. What Are The Various Techniques Of Stepping?
Answer :
These are the subsequent techniques of stepping: -
Step Over
Step Into
Step Return
Question 15. What Is Stepping In Java Debugger?
Answer :
In JDB, Stepping is a process to execute the code line via line. Thus, thru this technique each line of the code may be tested properly.
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Question sixteen. Can We Handle Exceptions Through Jdb?
Answer :
Yes, Java debugger is able to handling runtime exceptions. To deal with those exceptions it gives seize command.
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Question 17. What Is A Debugger?
Answer :
A debugger is a pc application used to identify and put off errors from other applications.
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