Learn Understanding Parameters and Arguments

Parameters vs. Arguments in Java

Parameters are the variable names you define in a method's declaration. They act as placeholders for the values your method will use when it runs.

Arguments are the actual values you provide when you call a method. These values are assigned to the method's parameters.

Example:

public void greet(String name) { // 'name' is a parameter
    System.out.println("Hello, " + name);
}

greet("Alice"); // 'Alice' is an argument

Parameters: Defined in the method declaration as part of the method signature;
Arguments: Supplied when you call the method;
Parameters receive the values of the arguments during method execution.

Main.java


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package com.example;

public class Main {
    // This method has two parameters: 'int a' and 'int b'
    public static int addNumbers(int a, int b) {
        // 'a' and 'b' are parameters inside the method definition
        return a + b;
    }

    public static void main(String[] args) {
        // Here, 5 and 7 are arguments passed to the method
        int result = addNumbers(5, 7);
        // '5' is the first argument, '7' is the second argument
        System.out.println("Sum: " + result);
    }
}

The method greet takes a single parameter name and prints a greeting using that argument, and the method add takes two parameters a and b and returns their sum.
In main, greet is called with "Alice" and add is called with 5 and 7, showing how arguments are passed to methods, and multiple parameters can be included in a method by separating them with commas.

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Section 2. Chapter 1

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