Control Statements 

Q: What is the purpose of an if-else statement?

Ans: It allows conditional execution of code blocks based on whether a condition is true or false.

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Q: Why do we use .equals() instead of == for string comparison?

Ans:

.equals() compares the actual content of two strings, while == checks if they reference the same memory location.

Control Statements

Switch Statement

 Q: When should you use a switch statement instead of if-else?

Control Statements

Q: What happens if you forget the break statement in a switch?

Ans:

Without break, execution will continue into the next case (fall-through behavior).

 Logical Operators (&&, ||, !)

Q: What does && do?

Ans:

It checks if both conditions are true

(logical AND).

 Logical Operators (&&, ||, !)

Q: What does || do?

"Can you remember what its called?"

Ans:

It checks if at least one condition is true (logical OR).

 Logical Operators (&&, ||, !)

Q: What does ! do?

"Can you remember what it's called?"

Ans:

The Logical NOT (!) operator reverses (negates) the truth value of a condition.

- If a condition is true, ! makes it false.

- If a condition is false, ! makes it true.

EX : boolean isRaining = true;  System.out.println(!isRaining);  // Output: false

isRaining is true, but !isRaining is false.

Modulo Operator (%)

Q: What does x % y return?

Ans:

The remainder when x is divided by y.

Modulo Operator (%)

Q:

How do you check if a number is even or odd using %?

Ans:

num % 2 == 0 means even,

num % 2 != 0 means odd.

Methods (Functions) in Java

Q:

What is a method in Java?

Ans:

A reusable block of code that performs a specific task.

Methods (Functions) in Java

Q: What’s the difference between a void method and a method with a return type?

Ans:

void methods perform actions without returning a value, while methods with a return type send back a result.

 Methods with Parameters

Q: Why do we use parameters ( )

in methods?

Ans:

To pass different values to a method, making it reusable.

Methods (Functions) in Java

Q: What happens if a method is called without passing required parameters?

Ans:

A compilation error occurs because Java expects the required arguments.

 Writing a Method with a Return Value

Q: How do you write a method that returns a value?

Ans:

You define the return type in your method (e.g., int, double, String), and use return to send back a result.

EX: public static int addNumbers(int a, int b) {

    return a + b;

}

Practicing Java Daily

Q: What are some daily Java practice exercises?

Ans:

Write a program to check if a number is even or odd.

Modify an if-else program to include additional conditions.

Create a method that converts Fahrenheit to Celsius.

Experiment with switch to categorize animals or car brands.