OOPS — Problems & Solutions

Print Student Information — link

class Student
{
  private string name;
  private int age;
  private int marks[] = new int[3];
  Student(String name, int Age, int Marks[])
  {
    name = Name;
    age = Age;
    marks[0] = Marks[0];
    marks[1] = Marks[1];
    marks[2] = Marks[2];
  }
  public string get_name()
    return name;
  public int get_age()
    return age;
  public int get_maximum()
  {
    int max = Marks[];
    if(marks[1] > marks[0] && marks[1] >= marks[2])
      max = marks[1];
    if(marks[2] >= marks[0] && marks[2] >= marks[1])
      max = marks[2];
    return max;
  }
}
public class Main
{
  public static void main(String[] args)
  {
    int marks[] = new int[3];
    marks[0] = 80;
    marks[1] = 85;
    marks[2] = 87;
    Student obj = new Student(Name: "Saksham", Age: 23, marks);
    System.out.println(obj.get_name());
    System.out.println(obj.get_age());
    System.out.println(obj.get_maximum());
  }
}

Output of The Number of Objects — link

class SchoolMember
{
  string name;
  static int num;
  SchoolMember() { }
  class Teacher extends SchoolMember
  {
    Teacher() { num++; }
  }
  class Student extends SchoolMember
  {
    Student() { num++; }
  }
}
public class Main
{
  public static void main(String[] args)
  {
    Student obj = new Student();
    Student obj1 = new Student();
    System.out.println(obj.num);
    System.out.println(obj1.num);
    System.out.println(SchoolMember.num);
  }
}

Using the transportation method — link

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class Vehicle
{
  int speed, acc, time, vol;
  Vehicle(int s, int a, int t, int v)
  {
    speed = s;
    acc = a;
    time = t;
    vol = v;
  }
  void move()
  {
    System.out.println("Speed = " + speed);
    System.out.println("Acceration = " + acc);
    System.out.println("Time = " + time);
  }
  void setSpeed(int initialSpeed)
  {
    speed = initalSpeed;
  }
  void speedUp()
  {
    speed = speed + acc * time;
  }
  void speedDown()
  {
    speed = speed - acc * time;
    if(speed < 0)
      speed = 0;
  }
}
public class Main
{
  public static void main(String args[])
  {
    Vehicle obj = new Vehicle(5,2,2,10);
    obj.setSpeed(10);
    obj.move();
    obj.speedUp();
    obj.move();
    obj.speedDown()
    obj.move();
  }
}

Perimeter and area of Square — link

class Rectangle
{
  int b, l;
  int perimeter()
    return 2 * (l + b);
  int area()
    return l * b;
}
class Square extends Rectangle
{
  Square() { }
  Square(int len)
    super(len,len);
}
public class Main
{
  public static void main(String[] args)
  {
    Square obj = new Square(5);
    System.out.println(obj.perimeter());
    System.out.println(obj.area());
  }
}

Performance of multiple instruments — link

class Instrument
{
  void makeNoise()
  {
    System.Out.Println("Instrument makes beautiful noise");
  }
}
class Erhu extends Instrument
{
  void makeNoise()
  {
    System.Out.Println("Erhu is good to hear");
  }
}
class Piano extends Instrument
{
  void makeNoise()
  {
    System.Out.Println("Piano is pleasing");
  }
}
class Violin extends Instrument
{
  void makeNoise()
  {
    System.Out.Println("Violin is pleasing");
  }
}
public class Main
{
  public static void main(String arg[])
  {
    Erhu obj = new Ehru();
    Piano obj1 = new Piano();
    Violin obj2 = new Violin();
    obj.makeNoise();
    obj1.makeNoise();
    obj2.makeNoise();
  }
}

Different Drinking Experience — link

interface Drinks
{
  void getName();
  void drinkFeeling();
}
class Water implements Drinks
{
  public void getName()
  {
    System.Out.Println("Water");
  }
  public void drinkFeeling()
  {
    System.Out.Println("Water is great");
  }
}
class Milk implements Drinks
{
  public void getName()
  {
    System.Out.Println("Milk");
  }
  public void drinkFeeling()
  {
    System.Out.Println("Milk is good");
  }
}
public class Main
{
  public static void main(String arg[])
  {
    Water obj1 = new Water();
    Milk obj2 = new Milk();
    obj1.getName();
    obj1.drinkFeeling();
    obj2.getName();
    obj2.drinkFeeling();
  }
}