/**
 Revised class for basic pet data: name, age, and weight.
 Constructors call another constructor.
*/
public class Pet3
{
    private String name;
    private int    age;   //in years
    private double weight;//in pounds

	public Pet3(String initialName, int initialAge, 
				double initialWeight)
	{
		set(initialName, initialAge, initialWeight); 
	}
	
	public Pet3(String initialName)
	{
		this(initialName, 0, 0); 
	} 
	
	public Pet3(int initialAge)
	{
		this("No name yet.", initialAge, 0); 
	}
	
	public Pet3(double initialWeight)
	{
		this("No name yet.", 0, initialWeight); 
	}
	
	public Pet3( )
    {
        this("No name yet.", 0, 0); 
    }
	    
	public void setPet(String newName, int newAge, double newWeight)
	{
		set(newName, newAge, newWeight); 
	}
	
    public void setName(String newName)
    {
		set(newName, age, weight);//age and weight are unchanged.
    }
    
    public void setAge(int newAge)
    {
		set(name, newAge, weight);//name and weight are unchanged. 
    }

    public void setWeight(double newWeight)
    {
		set(name, age, newWeight);//name and age are unchanged.
    }
      
	private void set(String newName, int newAge, 
				     double newWeight)
	{
		name = newName;
		if ((newAge < 0) || (newWeight < 0))
		{
			System.out.println("Error: Negative age or weight.");
			System.exit(0);
		}
		else
		{
			age = newAge;
			weight = newWeight;
		}
	}

    public String getName( )
    {
        return name;
    }
    
    public int getAge( )
    {
        return age;
    }
    
    public double getWeight( )
    {
        return weight;
    }
	
    public void writeOutput( )
    {
        System.out.println("Name:   " + name);
        System.out.println("Age:    " + age + " years");
        System.out.println("Weight: " + weight + " pounds");
    }
}