Question 02: Develop program using Object Oriented methodology in Java. Download hole Program / Project code, by clicking following link: go2collage/Basic-Python-Program-57 (github.com)
👉 Click Here: What is JDK tools? Explain with their use.
Main method is declared as static. Justify ? In Java, the main method is declared as static for several important reasons: - Entry Point: The main method serves as the entry point for a Java application. When you run a Java program, the Java Virtual Machine (JVM) starts execution from the main method. The static modifier allows the main method to be called without the need to create an instance of the class containing it. This is crucial because there is no object instantiated when the program starts; it's the first method that gets executed.
- Class-Level Method: Since the main method is typically called without creating an object of the class, it must be associated with the class itself rather than with an instance of the class. Declaring it as static makes it a class-level method, accessible via the class name.
- Consistency: Having the main method declared as static makes it consistent with the behavior of the JVM. The JVM can call the main method directly on the class without needing to create an object. This simplicity aligns with the design and execution model of Java applications.
- Efficiency: A static method doesn't require an instance of the class to be created, which can be more efficient in terms of memory and execution speed, especially since it's the first method to be executed when the program starts.
- Convenience: Making the main method static makes it easy to access, test, and run from other classes, tools, and environments. You can run a Java application with a simple java command followed by the class name, all without having to worry about creating an instance.
Declaring the main method as static in Java is essential for it to serve as the program's entry point and aligns with the way Java applications are executed by the JVM. It provides a convenient and efficient way to start a Java program without the need to create an object of the class containing the main method.
Program is named with class containing main method. Justify ? In Java, it's a convention that the program file is named after the class that contains the main method. This convention simplifies the development and execution of Java programs and is justified for several reasons: - Clarity and Readability: Naming the program file after the class with the main method makes the purpose of the file clear. When someone reviews or works with Java code, they can easily identify the entry point of the program. This promotes code readability and understanding.
- Convenience: When you have multiple classes in a Java project, each containing a main method for different purposes, giving the program file the same name as the class with the primary entry point simplifies execution. It's easier to remember which class to run when you want to start the program.
- Ease of Compilation and Execution: Java compilers and execution tools, like javac (for compilation) and java (for execution), expect the program file to have the same name as the class containing the main method. This simplifies the compilation and execution process. You can compile and run your Java program without specifying the class name explicitly, as Java tools will use the file name to locate the class.
- Consistency: Following naming conventions promotes consistency in Java codebases. When everyone follows the same naming convention, it's easier for a team of developers to collaborate on and maintain a project.
- Compatibility with IDEs: Most Integrated Development Environments (IDEs) and build tools also follow this naming convention. When you create a new class with a main method in an IDE, it often suggests or enforces the file name to match the class name.
- Standardization: Conforming to the naming convention aligns with Java programming standards and best practices, making your code more understandable for others who work with Java.
Naming the program file after the class containing the main method in Java is a convention that simplifies coding, compilation, and execution. It improves code readability, consistency, and compatibility with development tools and practices, making it a practical and widely followed convention in the Java community. Programming Code: Following code write in: BJ_P01.py // Java Program
// First Java Program
class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
// Thanks for Reading. Output:
👉 Click Here: What is JDK tools? Explain with their use.
- Entry Point: The main method serves as the entry point for a Java application. When you run a Java program, the Java Virtual Machine (JVM) starts execution from the main method. The static modifier allows the main method to be called without the need to create an instance of the class containing it. This is crucial because there is no object instantiated when the program starts; it's the first method that gets executed.
- Class-Level Method: Since the main method is typically called without creating an object of the class, it must be associated with the class itself rather than with an instance of the class. Declaring it as static makes it a class-level method, accessible via the class name.
- Consistency: Having the main method declared as static makes it consistent with the behavior of the JVM. The JVM can call the main method directly on the class without needing to create an object. This simplicity aligns with the design and execution model of Java applications.
- Efficiency: A static method doesn't require an instance of the class to be created, which can be more efficient in terms of memory and execution speed, especially since it's the first method to be executed when the program starts.
- Convenience: Making the main method static makes it easy to access, test, and run from other classes, tools, and environments. You can run a Java application with a simple java command followed by the class name, all without having to worry about creating an instance.
- Clarity and Readability: Naming the program file after the class with the main method makes the purpose of the file clear. When someone reviews or works with Java code, they can easily identify the entry point of the program. This promotes code readability and understanding.
- Convenience: When you have multiple classes in a Java project, each containing a main method for different purposes, giving the program file the same name as the class with the primary entry point simplifies execution. It's easier to remember which class to run when you want to start the program.
- Ease of Compilation and Execution: Java compilers and execution tools, like javac (for compilation) and java (for execution), expect the program file to have the same name as the class containing the main method. This simplifies the compilation and execution process. You can compile and run your Java program without specifying the class name explicitly, as Java tools will use the file name to locate the class.
- Consistency: Following naming conventions promotes consistency in Java codebases. When everyone follows the same naming convention, it's easier for a team of developers to collaborate on and maintain a project.
- Compatibility with IDEs: Most Integrated Development Environments (IDEs) and build tools also follow this naming convention. When you create a new class with a main method in an IDE, it often suggests or enforces the file name to match the class name.
- Standardization: Conforming to the naming convention aligns with Java programming standards and best practices, making your code more understandable for others who work with Java.
// Java Program
// First Java Program
class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
// Thanks for Reading. Output:
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