Answer 1

public class Vehicule{
private int num;
Vehicule(int num){
this.num=num;
}

//As private u need get Set Method
public int getnum(){
return num; //to get value
}

public void setnum(int numt){ // new var
this.num=numt; //val of object = new val
}

//method to print
public void Display(){
System.out.println("Num:"+num);
}
}

public class Test{
public static void main (String[]args){
//Creating instance here u set vslue
Vehicule V1 = new Vehicule(1);
Vehicule V2= new Vehicule(5);

V1.setnum(8); //Assigning 8 so numt=8
V1.Display() ;

}
}