Lab Sheet 8: Method Declaration and Parameter Passing

Lab Practical 1: Basic Method Creation

Objective: Create and call a simple method that prints a message.

public class MethodPractice {
    // Task 1: Create a method called printMessage that prints "I want to draw a circle."
    // Your code here

    public static void main(String[] args) {
        // Task 2: Call the printMessage method from main
        // Your code here
    }
}

Expected Output:

I want to draw a circle.

Lab Practical 2: Method with Parameters and Return Value

Objective: Create a method that takes parameters and returns a value.

public class Calculator {
    // Task 1: Create a method called addNumbers that takes two integers and returns their sum
    // Your code here

    public static void main(String[] args) {
        // Task 2: Call the addNumbers method with values 5 and 7, then print the result
        // Your code here

        // Task 3: Call the addNumbers method with values 10 and 15, then print the result
        // Your code here
    }
}

Expected Output:

12
25

Lab Practical 3: Access Specifiers Practice

Objective: Demonstrate different access specifiers.

public class AccessDemo {
    // Task 1: Create a public method called publicMethod that prints "This is public"
    // Your code here

    // Task 2: Create a private method called privateMethod that prints "This is private"
    // Your code here

    // Task 3: Create a protected method called protectedMethod that prints "This is protected"
    // Your code here

    // Task 4: Create a default access method called defaultMethod that prints "This is default"
    // Your code here

    public static void main(String[] args) {
        AccessDemo demo = new AccessDemo();
        // Call all methods that are accessible from here
        // Your code here
    }
}

Lab Practical 4: Static vs Instance Methods

Objective: Demonstrate the difference between static and instance methods.

public class MethodTypes {
    // Task 1: Create a static method called staticGreeting that prints "Hello from static method"
    // Your code here

    // Task 2: Create an instance method called instanceGreeting that prints "Hello from instance method"
    // Your code here

    public static void main(String[] args) {
        // Task 3: Call the static method directly
        // Your code here

        // Task 4: Create an object of MethodTypes and call the instance method
        // Your code here
    }
}

Expected Output:

Hello from static method
Hello from instance method

Lab Practical 5: Using Predefined Methods

Objective: Practice using Java's predefined methods.

public class PredefinedMethods {
    public static void main(String[] args) {
        String message = "Java Programming";

        // Task 1: Use the length() method and print the length of the message
        // Your code here

        // Task 2: Use the toUpperCase() method and print the message in uppercase
        // Your code here

        // Task 3: Use the Math.sqrt() method to calculate and print the square root of 25
        // Your code here

        // Task 4: Use the Math.random() method to generate and print a random number
        // Your code here
    }
}

Lab Practical 6: Comprehensive Method Practice

Objective: Combine all concepts into a more complex program.

public class CircleOperations {
    // Task 1: Create a private static constant PI with value 3.14159
    // Your code here

    // Task 2: Create a public static method calculateArea that takes radius as parameter and returns area
    // Your code here

    // Task 3: Create a public instance method calculateCircumference that takes radius and returns circumference
    // Your code here

    // Task 4: Create a private method displayResult that takes a description and value and prints them formatted
    // Your code here

    public static void main(String[] args) {
        double radius = 5.0;

        // Task 5: Call the static method to calculate area and print result
        // Your code here

        // Task 6: Create instance and call instance method to calculate circumference
        // Your code here

        // Bonus: Try to call the private displayResult method (what happens?)
        // Your code here
    }
}

Expected Output (approximate):

Area: 78.53975
Circumference: 31.4159