More Methods

A Forest object might need an area() method. This might be useful if you were modeling a real forest and needed to know how much CO² the forest was absorbing. Here is the class, with more blanks:

 
// Forest.java
//
public class Forest
{
  // instance variables
  private Tree tree0=null, tree1=null, tree2=null, tree3=null;
  
  // methods
  public void setTree( int treeNum, Tree tree ) 
  public Tree getTree( int treeNum )
  public String toString()
  
  public double area()
  {
       
      
  }
  
  public double volume()
  {
       
      
  }

}