Objects

class Dog {
    public String name;
    public String breed;
    public int age;

    public Dog(String name, String breed, int age){
        this.name = name;
        this.breed = breed;
        this.age = age;
    }

    public void bark(){
        System.out.println("Woof!");
    }
}

public class Main {
    public static void main(String[] args) {
        Dog myDog = new Dog("Shelby", "Golden Retriever", 5); // name, breed, age
        myDog.bark(); // should print "Woof!"
    }
}

Main.main(null);

Woof!

class Movie{
    public String title;
    
    public Movie(String title){
        this.title = title;
    }

    public void printTitle(){
        System.out.println(this.title);
    }
}

Movie myMovie = new Movie("Star Wars");
myMovie.printTitle();

Star Wars

public class Main {
    public static void main(String[] args) {
        Integer num1 = 50;
        Integer num2 = new Integer(75);
        
        Double d1 = 3.14;
        double d2 = new Double(2.718);
        
        System.out.println("Sum of integers: " + (num1 + num2));
        System.out.println("Product of doubles: " + (d1 * d2));
    }
}
Main.main(null);

Sum of integers: 125
Product of doubles: 8.53452

public class Main {
    public static void main(String[] args) {
        // TODO: Create an Integer object using autoboxing
        Integer myInteger = Integer.valueOf(123);

        // TODO: Create a double primitive from a Double object (unboxing)
        double myDouble = (new Double(123.45)).doubleValue();

        // TODO: Print both values
        System.out.println(myInteger);
        System.out.println(myDouble);
    }
}
Main.main(null);

123
123.45

import java.util.*;
public class Main {
    public static double randomize(double a, double b){
            return Math.random() * (b-a) + a;
    }
    public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       double a = scan.nextDouble();
       double b = scan.nextDouble();

       System.out.println("a: "+(new Double(a)).toString());
       System.out.println("b: "+(new Double(b)).toString());
       System.out.println(randomize(a, b));
    }
}

Main.main(null);

a: 2.0
b: 5.0
3.5490194837027325

public class Circle {
    public double radius;

    public Circle(double radius){
        this.radius = radius;
    }
    public double circumference(){
        return Math.PI * this.radius * 2;
    }

    public double area(){
        return Math.PI * Math.pow(this.radius,2) ;
    }
}

public class Student {
    public String name;
    public Integer grade;
    // 1. Class variables: name (String) and grade (Integer)

    public Student(String name, Integer grade){
        this.name = name;
        this.grade = grade;
    }

    public Student(String name, int grade){
        this.name = name;
        this.grade = new Integer(grade);
    }
    // 2. Constructor to initialize name and grade

    public int nameLength(){
        return this.name.length();
    }
    // 3. nameLength() method: Return the length of the student's name

    public Double getGradeAsDouble(){
        return new Double (this.grade.doubleValue());
    }
    // 4. getGradeAsDouble() method: Return the grade as the Double wrapper type

    public double getScaledGrade(){
        return this.grade.doubleValue() / 2;
    }
    // 5. getScaledGrade() method: Return grade divided by 2
}

public class Main {
    public static void main(String[] args) {
        // Testing the Circle class
        Circle circle1 = new Circle(5.0);
        Circle circle2 = new Circle(7.0);

        System.out.println("Circle 1:");
        System.out.println("Radius: " + circle1.radius);
        System.out.println("Circumference: " + circle1.circumference());
        System.out.println("Area: " + circle1.area());

        System.out.println("\nCircle 2:");
        System.out.println("Radius: " + circle2.radius);
        System.out.println("Circumference: " + circle2.circumference());
        System.out.println("Area: " + circle2.area());

        // Testing the Student class
        Student student1 = new Student("Aadit", 75);
        Student student2 = new Student("Emily", 45);

        System.out.println("\nStudent 1:");
        System.out.println("Name: " + student1.name);
        System.out.println("Name Length: " + student1.nameLength());
        System.out.println("Grade: " + student1.getGradeAsDouble());
        System.out.println("Scaled Grade: " + student1.getScaledGrade());

        System.out.println("\nStudent 2:");
        System.out.println("Name: " + student2.name);
        System.out.println("Name Length: " + student2.nameLength());
        System.out.println("Grade: " + student2.getGradeAsDouble());
        System.out.println("Scaled Grade: " + student2.getScaledGrade());
    }
}

Main.main(null);

Circle 1:
Radius: 5.0
Circumference: 31.41592653589793
Area: 78.53981633974483

Circle 2:
Radius: 7.0
Circumference: 43.982297150257104
Area: 153.93804002589985

Student 1:
Name: Aadit
Name Length: 5
Grade: 75.0
Scaled Grade: 37.5

Student 2:
Name: Emily
Name Length: 5
Grade: 45.0
Scaled Grade: 22.5