Method calling in Java

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Introduction

Method calling lets you use a set of instructions again and again without rewriting them.

When you want to organize your code into small reusable parts.

When you need to perform the same action multiple times in different places.

When you want to make your program easier to read and understand.

When you want to test parts of your program separately.

When you want to break a big problem into smaller steps.

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Syntax

Java

objectName.methodName(arguments);

objectName is the name of the object whose method you want to use.

methodName is the name of the method you want to call.

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Examples

line_end_arrow_notchCalls the println method to print text on the screen.

Java

System.out.println("Hello World");

line_end_arrow_notchCalls the startEngine method on the myCar object.

Java

myCar.startEngine();

line_end_arrow_notchCalls the add method with two numbers and stores the result.

Java

int sum = calculator.add(5, 3);

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Sample Program

This program defines a method called greet that prints a message. The main method calls greet to show how method calling works.

Java

public class Main {
    public static void greet() {
        System.out.println("Hello from the greet method!");
    }

    public static void main(String[] args) {
        greet(); // calling the greet method
        System.out.println("Back in main method.");
    }
}

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Important Notes

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You can call methods from other methods to reuse code.

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If a method needs information, you pass it as arguments inside the parentheses.

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Methods can return values that you can use after calling them.

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Summary

Method calling runs a set of instructions saved in a method.

It helps keep code organized and reusable.

You call a method using its name and parentheses, optionally with arguments.