Methods

Basic Method Structure

returnType methodName(parameters) {
    // method body or definition
}

• returnType: Output of the method
• parameters: Inputs to the method
• methodName: Identifier used to call the method
• method body: Set of instructions that perform a specific task

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What is a Method?

A method is a set of instructions written together to perform a specific task.

It helps in:

• Reusability
• Code organization
• Logical grouping of operations

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Elements of a Method

Every method consists of 4 main elements:

Element	Description
1. Method Name	Name used to call the method
2. Return Type	Type of value the method returns
3. Parameters	Inputs required by the method (optional)
4. Activity	The body (code) that defines the behavior

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Types of Methods (Based on Return Type and Parameters)

Type	Return Type	Parameters	Description
1.	No	No	Method does not take input and does not return any value
2.	No	Yes	Method takes input but does not return any value
3.	Yes	No	Method does not take input but returns a value
4.	Yes	Yes	Method takes input and returns a value

Examples:

// 1. No return, No parameter
tvoid greet() {
    System.out.println("Hello");
}

// 2. No return, With parameter
void greetUser(String name) {
    System.out.println("Hello " + name);
}

// 3. With return, No parameter
int getNumber() {
    return 10;
}

// 4. With return, With parameter
int add(int a, int b) {
    return a + b;
}

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Example

int add(int a, int b) {
    return a + b;
}

• Method Name: add
• Return Type: int
• Parameters: int a, int b
• Activity: return a + b;

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Tip

If a method does not return anything, use void as the return type.

void greet() {
    System.out.println("Hello!");
}

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Feel free to use these notes for documentation, learning, or class assignments!