Tiêu đề Java U-1 Combined Notes_60225526_2025_05_08_07_55 (2).pdf ✅

Object Oriented Programming with Java Java Source File Structure First Program in Java class HelloJava { public static void main(String args[]) { System.out.println("Hello, Java!"); } } Java source code is written in a .java file. Class Definition  In Java, every program must be enclosed in a class.  A class represents a set of similar objects.  It is recommended that the class name matches the file name.  The basic structure of a class looks like the following: class HelloJava { ... }
Object Oriented Programming with Java Java Source File Structure Main Method The main method is the starting point of every Java program. When we run a Java program, execution begins from the main method. - Signature of the Main Method The standard syntax of the main method is: public static void main(String args[]) public : Makes the method accessible from anywhere. static : Allows the method to run without creating an object of the class. void : Means the method does not return any value main : This is the entry point of the Java program. String args[]: An array of Strings (named args in the example) is passed as parameter to main.