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Section 1,2 Complete
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‎.idea/workspace.xml

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‎README.md

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@@ -20,4 +20,4 @@ Introduction to java programming for getting start android developing. This cour
2020
* Java Abstract Class
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* Java Polymorphism
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* Java Enums
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* Project1: Calculator!
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* Project1:

‎out/production/Basic_JAVA_Course/Calculator.class

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‎out/production/Basic_JAVA_Course/section1/Calculator.class

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‎out/production/Basic_JAVA_Course/section1/Main.class

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‎out/production/Basic_JAVA_Course/section1/Person.class

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‎out/production/Basic_JAVA_Course/section1/moving.class

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‎out/production/Basic_JAVA_Course/section1/talking.class

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‎out/production/Basic_JAVA_Course/section2/Circle.class

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‎out/production/Basic_JAVA_Course/section2/Rectangle.class

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‎out/production/Basic_JAVA_Course/section2/Shape.class

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‎src/Calculator.java

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‎src/section1/Calculator.java

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package section1;
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public class Calculator {
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public double add(double a, double b) {
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return a + b;
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}
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public double minis(double a, double b) {
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return a - b;
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}
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public double multiple(double a, double b) {
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return a * b;
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}
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public double division(double a, double b) {
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return a / b;
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}
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public double sin(float theta) {
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theta = (float) (theta * 180 / Math.PI);
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return Math.sin(theta);
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}
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public double cos(float theta) {
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theta = (float) (theta * 180 / Math.PI);
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return Math.cos(theta);
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}
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public double tan(float theta) {
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theta = (float) (theta * 180 / Math.PI);
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return Math.tan(theta);
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}
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public double cot(float theta) {
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theta = (float) (theta * 180 / Math.PI);
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return 1 / tan(theta);
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}
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}

‎src/section1/Main.java

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// Package path for class
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package section1;
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public class Main {
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//Field
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private int number;
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protected int number2;
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int num3;
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// All classes you need to import
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import section2.Circle;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Scanner;
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// Class Deceleration
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public class Main {
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public static void main(String[] args) {
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// Object Instantiation
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Calculator calculator = new Calculator();
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// Method Call using dot(.)
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double result = calculator.division(5, 0);
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System.out.println("Result is : " + result);
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// Convert String to Integer
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int num = Integer.parseInt("15");
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System.out.println("Your integer number is : " + num);
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// Convert Integer to String
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String numString = String.valueOf(40);
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System.out.println("String of your Integer is : " + numString);
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//Array Instantiation
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// Using array as List, Note you can't edit!
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int[] fixNumbers = new int[]{1, 2, 3, 4, 5};
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char[] charArray = new char[255];
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Person[] persons = new Person[5];
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persons[0] = new Person("Ali", 20);
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persons[2] = new Person("Sara", 18);
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persons[1] = new Person("Saeed", 18);
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persons[3] = new Person("Zahra", 23);
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persons[4] = new Person("Nasim", 21);
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// In the tag (<>) Most Insert a Object Like Integer not int (and other primitive type) !!
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//List<int> wrongList = new ArrayList<>();
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List<Integer> integers = new ArrayList<>();
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integers.add(2);
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integers.add(3);
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integers.add(233);
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System.out.println(integers);
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// Remove by Object
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integers.remove(new Integer(2));
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System.out.println(integers);
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//Remove by index
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integers.remove(0);
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System.out.println(integers);
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// Getting input from user using Scanner class, System.in means we get input from keyboard.
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System.out.println("PLEASE ENTER A SENTENCE:");
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Scanner scanner = new Scanner(System.in);
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// nextLine Method return Write in Consul
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String input = scanner.nextLine();
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System.out.println("Your Input is : " + input);
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// PROGRAM FLOW
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// if example
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boolean flag = false;
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if (flag) {
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System.out.println("flag is TRUE");
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}
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else {
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System.out.println("flag is FALSE");
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}
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// for example
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int counter = 0;
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for (int i = 0 ; i < 10 ; i++) {
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counter++;
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}
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System.out.println("Counter : " + counter);
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// while example
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boolean condition = false;
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while (condition) {
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//Instruction
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System.out.println("IN WHILE");
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}
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System.out.println("While Condition is False");
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// for each example
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for (Person p : persons) {
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p.sayHello();
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}
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// Switch case example
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System.out.println("PLEASE ENTER A NUMBER BETWEEN 1 - 5");
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int in = scanner.nextInt();
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switch (in) {
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case 1:
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System.out.println("Your Input is One");
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break;
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case 2:
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System.out.println("Your Input is Two");
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break;
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case 3:
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System.out.println("Your Input is Three");
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break;
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case 4:
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System.out.println("Your Input is Four");
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break;
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case 5:
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System.out.println("Your Input is Five");
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break;
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default:
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System.out.println("Your Input is out of range");
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}
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// Inheritance and Polymorphism (Method Overriding)
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int radios = 5;
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Circle circle = new Circle(radios);
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System.out.println("Area of circle with radios " + radios + " is " + circle.calArea());
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}
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}

‎src/section1/Person.java

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package section1;
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import java.util.ArrayDeque;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Queue;
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// Import other class that we need, here!
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public class Person {
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public class Person implements talking, moving {
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private String name;
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private int age;
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// public static String nationality;
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// public final static String className = "Person";
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// Constructor 1
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// Static & final Keyword
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public final static String className = "Person";
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// Constructor 1 : 'this' keyword point to current class
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public Person(String name, int age) {
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this.name = name;
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this.age = age;
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}
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// Constructor 2
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public Person(int age) {
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this.age = age;
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// Constructor 2 : 'this' keyword point to current class
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public Person(String name) {
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this.name = name;
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}
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// Sample Method for renaming person
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public void rename(String newName) {
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this.name = newName;
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}
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// + in String Meaning to Concatenation of substring
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@Override
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public String toString() {
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return "name: " + name;
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}
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// All Methods Below are defined in interfaces and Implementation's is here
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@Override
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public void sayHello() {
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System.out.println("Hi I'm " + this.name);
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System.out.println("Hi I'm " + name);
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}
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public static void main(String[] args) {
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Person a = new Person("ali", 2);
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Person b = new Person("ali", 2);
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Person c = new Person("ali", 2);
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// Person b = new Person(2);
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// a = b;
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// Person.className = "sadsad";
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// System.out.println(Person.className);
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Person ali = new Person("ali", 4);
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List<Person> people = new ArrayList<>();
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Queue<Person> queue = new ArrayDeque<>();
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// people.add(new Person(4));
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// people.remove(0);
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// people.remove(ali);
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@Override
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public void saySomething(String something) {
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System.out.println(something);
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}
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@Override
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public void move(int dx) {
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System.out.println("I'm walking " + dx + " meters");
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}
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@Override
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public void run(int v) {
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System.out.println("I'm running " + v + " m/s");
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}
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}

‎src/section1/moving.java

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package section1;
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public interface moving {
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void move(int dx);
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void run(int v);
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}

‎src/section1/talking.java

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package section1;
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public interface talking {
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void sayHello();
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void saySomething(String something);
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}

‎src/section2/Circle.java

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package section2;
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public class Circle extends Shape {
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private int r;
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public Circle(int r) {
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this.r = r;
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}
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@Override
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public double calArea() {
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area = Math.PI * r * r;
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return area;
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}
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@Override
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public double calEnv() {
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env = 2 * Math.PI * r;
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return env;
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}
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}

‎src/section2/Rectangle.java

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package section2;
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public class Rectangle extends Shape {
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private float width;
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private float height;
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public Rectangle(float width, float height) {
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this.width = width;
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this.height = height;
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}
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@Override
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public double calArea() {
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area = width * height;
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return area;
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}
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@Override
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public double calEnv() {
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env = 2 * (width + height);
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return env;
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}
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}

‎src/section2/Shape.java

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package section2;
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public abstract class Shape {
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protected double area;
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protected double env;
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// abstract methods for implementation in other formation
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public abstract double calArea();
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public abstract double calEnv();
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@Override
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public String toString() {
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return "Shape class";
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}
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}

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