Now we are going to use the design pattern for collecting objects. We are going

Question

Now we are going to use the design pattern for collecting objects. We are going to model a Orchard with trees. An Orchard uses an ArrayList to keep track of Tree objects. You will write both a Orchard class and a Tree class. A Tree has a type and a height. Provide a constructor that takes type and height, in that order. Provide getters and setters for the instance variables. This is the design pattern for managing properties of objects. An Orchard has a constructor that takes no parameters. Remember, it must initialize the instance variable. It has methods: add() - adds the specified Tree to the Orchard. tallest() - gets the type of the tallest Tree in the Orchard or null if the Orchard is empty. Initialize the tallest with the first element. contains() - determines if a Tree of the given type is in the Orchard. Returns true if a Tree of the given type is in the Orchard. Otherwise, false. treeList() - gets an ArrayList containing the types of all the Trees in the Orchard. Provide Javadoc for both classes. The tester class: import java.util.ArrayList; /** * Tester for Orchard */ public class OrchardTester { public static void main(String[] args) { Orchard trees = new Orchard(); trees.add(new Tree("lemon",12.5 )); trees.add(new Tree("apple", 20.0)); trees.add(new Tree("cherry", 13.5)); trees.add(new Tree("avocado", 35.0)); trees.add(new Tree("apricot", 17)); System.out.println(trees.treeList()); System.out.println("Expected: [lemon, apple, cherry, avocado, apricot]" ); System.out.println(trees.tallest()); System.out.println("Expected: avocado"); System.out.println(trees.contains("cherry")); System.out.println("Expected: true"); System.out.println(trees.contains("peach")); System.out.println("Expected: false"); trees = new Orchard(); trees.add(new Tree("lemon",12.5 )); trees.add(new Tree("apple", 20.0)); trees.add(new Tree("cherry", 13.5));; trees.add(new Tree("apricot", 17)); System.out.println(trees.treeList()); System.out.println("Expected: [lemon, apple, cherry, apricot]"); System.out.println(trees.tallest()); System.out.println("Expected: apple"); } } codecheck: http://www.codecheck.it/files/18032404228b3ahkjihrmhq3ahapi02afij

Explanation / Answer

Given below is the code for the question.
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Tree.java
----------
public class Tree{
private String type;
private double height;
public Tree(String type, double height){
this.type = type;
this.height = height;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}

}

Orchard.java
------------
import java.util.ArrayList;

public class Orchard {
private ArrayList<Tree> trees;

public Orchard(){
trees = new ArrayList<Tree>();
}
public void add(Tree tree) {
trees.add(tree);
}

public ArrayList<String> treeList(){
ArrayList<String> list = new ArrayList<String>();
for(Tree t : trees)
list.add(t.getType());
return list;
}

public boolean contains(String type){
for(Tree t : trees){
if(t.getType().equals(type))
return true;
}

return false;
}

public String tallest(){
Tree tallest = null;

if(trees.size() > 0)
tallest = trees.get(0);

for(int i = 1; i < trees.size(); i++){
if(trees.get(i).getHeight() > tallest.getHeight())
tallest = trees.get(i);
}
if(tallest == null)
return null;
else
return tallest.getType();
}

}

output
-----
[lemon, apple, cherry, avocado, apricot]
Expected: [lemon, apple, cherry, avocado, apricot]
avocado
Expected: avocado
true
Expected: true
false
Expected: false
[lemon, apple, cherry, apricot]
Expected: [lemon, apple, cherry, apricot]
apple
Expected: apple

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