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

Helping elements

• The new class is to be saved in the same directory training matching its package name

• the dbh instance variable should be private and double

• the constructor has the same name than the class: Tree and no return type

• the constructor takes one parameter (or argument), it assigns the value of the parameter to the instance variable like this: this.dbh = dbh (this.dbh is the instance variable and dbh is the method parameter)

• the getter for a variable named dbh is a method called getDbh(), it is public and returns dbh

• to create an object of type Tree, use new Tree (…) and pass the expected argument

• If t1 is a reference to a Tree object, System.out.println (t1.toString ()) or System.out.println (“” + t1) print the result of its toString() method to the terminal

• To compile all classes of the training package in a terminal: from the java directory, type javac training/*.java

A possible solution