Day 7 : Methods in Java in Telugu | Java Course in Telugu | Vamsi Bhavani

Understanding Java Loops and Methods In Java, a 'while' loop does not execute statements if the condition is false initially, unlike a 'do-while' loop which executes at least once regardless of the condition. A code example demonstrates how loops behave based on conditions; for instance, when incrementing variables within constraints like "i < 1," execution halts as soon as the condition fails. The discussion also touches upon break and continue statements in loops but leaves detailed exploration for later sessions.

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Methods are blocks of code designed to perform specific tasks, making programming more organized. They enhance readability by allowing developers to name functions descriptively, such as "onButtonClick," which clarifies the purpose and improves understanding. Reusability is another key advantage; methods prevent repetitive coding by enabling reuse across different parts of a program. Additionally, they improve compilation efficiency and facilitate teamwork since individual team members can focus on separate modules without overlapping responsibilities.

Java methods are defined with a return type, method name, parameters in parentheses, and enclosed within curly braces. The 'main' function is the entry point of any Java program; it has a void return type since it does not return data. Parameters like String[] args allow passing arguments from the console to the program during execution. Access modifiers such as public or private define visibility levels for classes and methods. Creating objects enables calling class-specific methods; for instance, using "new" instantiates an object that can execute its associated functions. A simple example involves defining a method named sayHello() which prints "hello." This demonstrates how user-defined functions operate alongside built-in ones like those in Scanner.

The discussion focuses on creating functions in Java, starting with a simple 'sayHello' function that can take parameters to customize the greeting. It then transitions into building an 'addNumbers' function which takes two integers as inputs, adds them together, and prints the result using System.out.println. The process involves defining integer variables for input values (e.g., 2 and 3), assigning these automatically through IDE annotations, performing addition within the method body, and calling this method multiple times with different arguments like (10 & 2) or (12 & 7). Finally, after saving the code file named methods.java it is compiled via PowerShell commands before running successfully.

Parameters are variables used to pass data into functions, with their number determining the attributes of a function. A return type specifies what kind of value a function sends back after execution. For example, multiplying two numbers involves passing them as parameters (e.g., 2 and 3), performing the operation within the function (resulting in 6), and returning this result to be printed or further utilized by the caller. The distinction between 'caller' (which invokes) and 'callee' (the invoked entity) is crucial for understanding functional programming.