Need Help with Writing a Subclass in Java: Am I Doing It Right?

[courtrigrad]

Hello all

I need help in writing a subclass (ManMade) that has 2 constructors and 3 isntance variables. Here is my code so far:

public class Thing
{
   
    
        
        private double length;        // instance variables (fields)
        private double height;
        private double width;
        private boolean isPurpleFox;
        private double age;
        private static boolean exists;
    
    //*******************************//
    
        public Thing()
        {
            length = 7;
            height = 8;
            isPurpleFox = false;
            age = 0;
            exists = true;
            width = 10;
        }
        //======================================
        public double getlength()
        {
            return length;
        }
        
        public void setAge(double a)
        {
            age = a;
        }
    
        public double getage()
        {
            return age;
        }
        public boolean getexists()
        {
            return exists;
        }
        
        public void setexists(boolean b)
        {
            exists = b;
            
        
        }
        public void Triple(int a)
        {
            a = a*3;
            System.out.println(a);
        }
    
    
        public Thing (double l, double w, double h )
        {
            length = l;
            width =  w;
            height = h;
            
       }
    }
    
   


// Subclass of Superclass
// Thing

public class ManMade extends Thing {  // inherits from Thing
    private string name;
    private double volume;
    private double surfarea;
    
    // no argument constructor
    public ManMade()
    {
        super(0, 0); // call the superclass contructor
        name = ;
    }
    
    // Constructor
    public ManMade( double l, double, w, double h, char s )
    {
        super( l, w, h); // call the superclass constructor
        setName( "Bob" )
        setVolume( v );
        setSurarea( S );

I am not sure whether i am doing this right.

any help is appreciated

 

[Nylex]

When you post code, can you please say what you want to do. What is it that you aren't sure of?? You make a subclass by using the extends keyword, like you've done, so what's the problem? All I can see a problem is with the line

name = ;

You need to write name = " "; cos otherwise the code won't compile (obviously you won't be able to compile that code on its own, as there's no main(), but you know..).

 

[ramollari]

Hello all

     public ManMade()
    {
        super(0, 0); // call the superclass contructor
        name = ;
    }

Where is the

Thing

constructor with two arguments?