Notes

import java.util.Scanner;

abstract class Vehicle {
private String brand;
private int year;
private int cc;
private String size;

public Vehicle(String brand, int year, int cc, String size) {
this.brand = brand;
this.year = year;
this.cc = cc;
this.size = size;
}

public Vehicle() {
this("", 0, 0, "");
}

public String getBrand() {
return brand;
}

public void setBrand(String brand) {
this.brand = brand;
}

public int getYear() {
return year;
}

public void setYear(int year) {
this.year = year;
}

public int getCc() {
return cc;
}

public void setCc(int cc) {
this.cc = cc;
}

public String getSize() {
return size;
}

public void setSize(String size) {
this.size = size;
}

abstract void show();
}

class Truck extends Vehicle {
public Truck(String brand, int year, int cc, String size) {
super(brand, year, cc, size);
}

public Truck() {
super();
}

// Constructor overloading
public Truck(String brand, int year) {
super(brand, year, 0, "");
}

@Override
void show() {
System.out.println("Truck Information:");
System.out.println("Brand: " + getBrand());
System.out.println("Year: " + getYear());
System.out.println("CC: " + getCc());
System.out.println("Size: " + getSize());
}
}

class Bus extends Vehicle {
public Bus(String brand, int year, int cc, String size) {
super(brand, year, cc, size);
}

public Bus() {
super();
}

// Constructor overloading
public Bus(int year) {
super("", year, 0, "");
}

@Override
void show() {
System.out.println("Bus Information:");
System.out.println("Brand: " + getBrand());
System.out.println("Year: " + getYear());
System.out.println("CC: " + getCc());
System.out.println("Size: " + getSize());
}
}

public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

System.out.println("Enter truck details:");
Truck truck1 = new Truck();
System.out.print("Brand: ");
truck1.setBrand(scanner.nextLine());
System.out.print("Year: ");
truck1.setYear(scanner.nextInt());
scanner.nextLine(); // Consume newline
System.out.print("CC: ");
truck1.setCc(scanner.nextInt());
scanner.nextLine(); // Consume newline
System.out.print("Size: ");
truck1.setSize(scanner.nextLine());

Truck truck2 = new Truck("Ford", 2022);

System.out.println("nEnter bus details:");
Bus bus1 = new Bus();
System.out.print("Brand: ");
bus1.setBrand(scanner.nextLine());
System.out.print("Year: ");
bus1.setYear(scanner.nextInt());
scanner.nextLine(); // Consume newline
System.out.print("CC: ");
bus1.setCc(scanner.nextInt());
scanner.nextLine(); // Consume newline
System.out.print("Size: ");
bus1.setSize(scanner.nextLine());

Bus bus2 = new Bus(2021);

System.out.println("nDisplaying vehicle information:");
truck1.show();
System.out.println();
truck2.show();
System.out.println();
bus1.show();
System.out.println();
bus2.show();

scanner.close();
}
}