Implementing Inheritance In Java

i was leaning inheritance and tried to implement it in Java.This is my base class vehicl.java

public class vehicle{
private int topSpeed;
private int cubicCap;
private String modelName;
private boolean hasAlloy;

[code]...

I also have a derived class called car.java.What i wanted to do in the derived class was that i wanted to override the constructor as well as the getInfo() method from the base class.I wanted to add an additional attribute to the car "numberSeats" and display tat too when the object to car class calls the getInfo() method .It showed an error "identifier required" when i tried to compile car.java program.

import java.util.Scanner;
public class car extends vehicle{
//int numberSeats;
//System.out.println("Enter the number of Seats");
Scanner numberSeats=new Scanner(System.in);
numberSeats=numberSeats.nextInt();
//System.out.println(numberSeats.nextInt());

[code]....

explain the errors that i get when i tried to compile car.java without using super keyword or without defining the constructor from the Car class ?