Try to work with the helping elements before looking at the solution…

Helping elements

• class named SpatializedTree → the source code must be saved in a file named SpatializedTree.java

• use inheritance: the new class is a subclass of Tree: SpatializedTree extends Tree

• the dbh instance vaiable is inherited from the Tree superclass, do not add it again

• the two new instance variables for the tree location are private double x; and private double y;

• the SpatializedTree constructor takes 3 parameters: double dbh, double x, double y

• in the constructor, dbh is passed to the constructor of the superclass: super(dbh), then x and y are saved in the instance variables with code like: this.x = x;

• it is possible to propose a single setter method for the two variables x and y: setXY (double x, double y)

• the toString() method can be linked to the toString() method of the Tree superclass by writing: return super.toString() + “, x: ” + x + “, y: ” + y;

A possible solution