Debugging and Error Handling

Debugging

It is the process of identifying and resolving issues or bugs in the code. It is the process of identifying, analyzing, and fixing errors (bugs) in software or hardware systems.

Crucial Step

Debugging is a ______ in programming and software development to ensure that a program functions correctly and efficiently.

Focus

Identifying and fixing defects or bugs in the code.

Goal

Ensure the code works as intended

Process

Step-by-step examination of the code, often using tools like debuggers or print statements.

Output

Corrected code, usually with fixes for specific bugs.

When

Typically done during development, testing, or maintenance phases.

Understand the Problem
Use Debugging Tools
Common Debugging Techniques

Steps for Debugging

Understand the Problem

Reproduce the bug consistently. Understand the expected behavior and actual outcome.

Use Debugging Tools

Modern Integrated Development Environments (IDEs) like IntelliJ IDEA, Eclipse, and NetBeans offer built-in debugging tools. These tools help step through the code, inspect variable values, and monitor program flow in real time.

Print Statement
Breakpoints
Step Through Code

Common Debugging Techniques

Print Statement

Insert System.out.println() statements to print variable values or track where the code is executing.

Breakpoints

Set breakpoints in an IDE to pause the program execution at a specific line and inspect the state of the program at that point

Step Through Code

After setting breakpoints, step through the code line by line to observe how it behaves and identify where things go wrong.

1. Open the file in an IDE.
2. Click on the line number where you want to stop execution.
3. Run the program in debug mode (not normal execution).
4. The program pauses at the breakpoint, allowing you to check values.

Steps in using debugger in an IDE

Step 1

Open the file in an IDE.

Step 2

Click on the line number where you want to stop execution.

Step 3

Run the program in debug mode (not normal execution).

Step 4

The program pauses at the breakpoint, allowing you to check values.

Error-handling

It is the process of gracefully managing runtime errors (exceptions) to prevent program crashes. It ensures that the program responds appropriately when an error occurs.

Does not crash unexpectedly

Error-handling ensures that the program ________ and responds to errors gracefully.

Syntax Error
Runtime Errors (Exceptions)
Logical Errors

Types of Errors Handled

Syntax Error

Caught by the compiler before execution.

Runtime Errors (Exceptions)

Handled using try-catch blocks.

Logical Errors

that produce incorrect results.