? Java Method Parameters

? Quick Overview

Method parameters in Java allow you to pass data into a method so it can perform operations using that data. Parameters act as variables that receive values when a method is called.

? Key Concepts

Parameters are defined inside method parentheses
Multiple parameters are separated by commas
Java uses pass-by-value
Parameter types must be specified

? Syntax / Theory

A method can accept zero or more parameters. Each parameter consists of a data type and a variable name.

? View Code Example

// Method with parameters
returnType methodName(dataType param1, dataType param2) {
    // Method body uses parameters
}

? Code Example(s)

? View Code Example

// Java program demonstrating method parameters
class Calculator {

    // Method that accepts two parameters
    static int add(int a, int b) {
        return a + b;
    }

    public static void main(String[] args) {
        // Passing arguments to the method
        int result = add(10, 20);
        System.out.println(result);
    }
}

? Live Output / Explanation

Output

The values 10 and 20 are passed as arguments to the add method. They are received by parameters a and b, then added and returned.

? Interactive Simulator

Enter values to simulate passing arguments to the add(int a, int b) method.

int a (Arg 1)

int b (Arg 2)

// Visualizing the call inside main:
int result = add(5, 15);

// Inside the method:
return 5 + 15;

> Returns: 20

✅ Tips & Best Practices

Use meaningful parameter names
Keep parameter count minimal
Prefer objects when passing many values
Match argument order with parameter order

? Try It Yourself

Create a method that multiplies two numbers
Write a method that accepts a string and prints its length
Pass different values and observe the output