Java एनवायरनमेंट सेटअप

public class Main {
	// The JDK provides: javac (compiler), java (launcher), debugging tools, and the JRE/JVM
	public static void main(String[] args) {
		System.out.println("Built and run using tools bundled in the JDK.");
	}
}

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public class Main {
	// Written in an IDE like IntelliJ IDEA, Eclipse, or VS Code (Java extension pack)
	public static void main(String[] args) {
		System.out.println("Code written with autocomplete and inline error highlighting.");
	}
}

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public class Calculator {
	// This file MUST be saved as Calculator.java, matching the class name exactly (case-sensitive)
	public static void main(String[] args) {
		System.out.println("Saved as Calculator.java to match 'public class Calculator'.");
	}
}

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public class Main {
	// Terminal: javac Main.java
	// Checks syntax/types, then emits Main.class (JVM bytecode) in the same folder
	public static void main(String[] args) {
		System.out.println("Compiled with: javac Main.java");
	}
}

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public class Main {
	// Terminal: java Main   (no .java or .class extension)
	public static void main(String[] args) {
		System.out.println("Executed by the JVM starting from main().");
	}
}

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