JavaForAndroid/JavaLecture5.java at main · rizwan-ai/JavaForAndroid · GitHub

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// package com.rit;

public class JavaLecture5 {

public static void main(String[] args) {

// System.out.println("Hi Java");

// Simplest "Procedural-style Programming" program should have at least one "class"

// and the "main method" inside it to start the program.

// The "main method" is the entry point for any applications.

// public class JavaLecture5

// Here is a class named "JavaLecture5". The class contains the "main method" for starting the program.

// - "public" keyword is an access modifier

// - "class" keyword is used to declare a class in java

// public static void main(String[] args)

// - The keyword "public" indicates that the method can be invoked from everywhere

// - The keyword "static" indicates the method can be invoked without creating an instance of the class

// - The keyword "void" indicates the method doesn't "return" any value

// - The array variable "args" contains arguments entered at the "command line" if there are no arguments then the array is empty

// Java Variables

// DataType variableName = value;

String msg;

msg = "Hi Java";

System.out.println(msg);

int count = 5;

System.out.println(count);

boolean status = true;

status = false;

System.out.println(status);

double x = 4.5, y = 6.8;

System.out.println(x + y);

float cgpa = 3.68f;

System.out.println(cgpa);

char grade = 'A';

char grade_copy = grade;

System.out.println(grade_copy);

// Java Constants

final float PI = 3.14f;

// PI = 3; // Error: Cannot assign a value to final variable 'PI'

System.out.println(PI);

// Types of Java Variables

// - Local Variable (within method or block)

// - Instance Variable

// - Static Variable

}

JavaForAndroid/JavaLecture5.java at main · rizwan-ai/JavaForAndroid · GitHub

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