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What is a single-line comment?
A comment that exists on one line, starting with '//'.
What is a multi-line comment?
A comment that can span multiple lines, starting with '/*' and ending with '*/'.
What is Javadoc?
A special type of comment used to generate API documentation, starting with '/**' and ending with '*/'.
What are preconditions?
Constraints that input to a method must follow.
What are postconditions?
Constraints that the output of a method must follow.
What is the purpose of comments in code?
To explain sections of code, improve readability, and provide documentation.
What is documentation in programming?
Explanatory text that describes the purpose, functionality, and usage of code.
What is the syntax for a single-line comment in Java?
// This is a single-line comment
What is the syntax for a multi-line comment in Java?
/* This is a multi-line comment */
What is the syntax for a Javadoc comment in Java?
/** This is a Javadoc comment */
Why are comments important for code maintainability?
They help developers understand the code's purpose and logic, making it easier to modify and debug.
When should you use comments in your code?
To explain complex logic, clarify non-obvious code, and document methods and classes.
What is the purpose of Javadoc comments?
To generate external documentation for APIs, classes, and methods.
Why are preconditions important in method documentation?
They specify the expected input conditions, helping users avoid errors.
Why are postconditions important in method documentation?
They describe the expected outcome or state after a method is executed.
What is the role of comments in collaborative coding?
Comments facilitate communication and understanding among team members working on the same project.
How do comments affect the compilation process?
Comments are ignored by the compiler and do not affect the executable code.
What is the benefit of using Javadoc tags like @param and @return?
They provide structured information for generating API documentation.
What are some best practices for writing effective comments?
Keep comments concise, accurate, and up-to-date with the code.
How do comments contribute to code readability?
They provide context and explanations, making the code easier to understand at a glance.
Identify the error in the following code:
```java
/* This is a comment
public class MyClass {
}
```
The multi-line comment is not closed. It should end with '*/'.
What is the purpose of the following Javadoc comment?
```java
/**
* This method calculates the sum of two numbers.
* @param a The first number.
* @param b The second number.
* @return The sum of a and b.
*/
public int add(int a, int b) {
return a + b;
}
```
To document the 'add' method, including its parameters and return value for API documentation.
Which type of comment is best suited for documenting a class for external use?
Javadoc comments.
What is the output of the following code? (Consider the comments)
```java
public class Test {
public static void main(String[] args) {
int x = 5; // Initialize x to 5
// x = 10; // This line is commented out
System.out.println(x);
}
}
```
5
Complete the following Javadoc comment for a method that calculates the area of a rectangle:
```java
/**
* Calculates the area of a rectangle.
* @param width The width of the rectangle.
* @param height The height of the rectangle.
* @return ______
*/
public double calculateArea(double width, double height) {
return width * height;
}
```
The area of the rectangle.
Identify the best use of comment in the following code:
```java
public class Example {
public static void main(String[] args) {
int i = 0; // declaring i
i++; // incrementing i
}
}
```
The comments are redundant and unnecessary because the code is self-explanatory.
Write a single-line comment that explains the following line of code:
```java
int age = 25;
```
// Declares an integer variable 'age' and initializes it to 25
Write a multi-line comment to describe the purpose of a class that represents a circle.
/* This class represents a circle with a given radius. It provides methods to calculate the area and circumference of the circle. */
How would you document a parameter named 'radius' in a Javadoc comment?
@param radius The radius of the circle
How would you document the return value of a method that returns the area of a circle in a Javadoc comment?
@return The area of the circle