Question

Write in drjava

Problem

Design and implement these 4 files:

1. A parent class called Plant with name (eg Rose, Douglas Fir) and lifespan (could be in days, weeks, months or years) attributes
2. Tree inherits from Plant and adds a height attribute
3. Flower inherits from Plant and adds a color attribute
4. A driver file to test the 3 classes above.

The classes described in #1, 2 and 3 above should have the usual constructors (default and parameterized), get (accessor) and set (mutator) methods for each attribute, and a toString method

Child classes should call parent methods whenever possible to minimize code duplication.

The driver program must test all the methods in each of the classes. Include comments in your output to describe what you are testing, for example   System.out.println(“testing Plant toString, accessor and mutator”);. Print out some blank lines in the output to make it easier to read and understand what is being output.

Assignment Submission:

Submit a print-out of each class file, the driver file and a sample of the output.

Marking Checklist

1. Does EACH class have all the usual methods?
2. Are all methods in EACH class tested, including child objects calling inherited parent methods?
3. Does the child class call the parent’s constructor?
4. Does the child class override the parent’s toString?
5. Does the output produced have lots of comments explaining what is being output?
6. Does each class, and the output, have blank lines and appropriate indenting to make them more readable?

Answer 1

class Plant{
    String name;
    String lifeSpan;

    //Default Constructor
    public Plant(){

    }

    //Parametrized Constructor
    public Plant(String name,String lifeSpan){
        this.name=name;
        this.lifeSpan=lifeSpan;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLifeSpan() {
        return lifeSpan;
    }

    public void setLifeSpan(String lifeSpan) {
        this.lifeSpan = lifeSpan;
    }

    public String toString(){
        return "\n\tName:"+name+"\n\tLifeSpan:"+lifeSpan;
    }
}

class Tree extends Plant{
    float height;

    //Default Constructor
    public Tree(){

    }

    //Parametrized Constructor
    public Tree(float height,String name,String lifeSpan){
        super(name,lifeSpan); //Super Class Constructor
        this.height=height;
    }

    public float getHeight() {
        return height;
    }

    public void setHeight(float height) {
        this.height = height;
    }

    public String toString(){
        return "\n\t"+super.toString()+"\n\tHeight:"+height;
    }

}

class Flower extends Plant{
    String color;

    //Default Constructor
    public Flower(){

    }

    //Parametrized Constructor
    public Flower(String color,String name,String lifeSpan){
        super(name,lifeSpan); //Super Class Constructor
        this.color=color;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String toString(){
        return "\n\t"+super.toString()+"\n\tColor:"+color;
    }
}


public class drjava{
    public static void main(String args[]){

        System.out.println("\n\nPlant DETAILS\n");
        Plant plant=new Plant();
        System.out.println("Testing Plant Setter and Getter and toString Methods");
        plant.setName("Rose");
        plant.setLifeSpan("2Years");
        System.out.println("Plant Name:"+plant.getName());
        System.out.println("Plant LifeSpan:"+plant.getLifeSpan());
        System.out.println("Plant toString:"+plant.toString());

        System.out.println("\n\nTREE DETAILS\n");
        Tree tree=new Tree();
        System.out.println("Testing Tree Setter and Getter and toString Methods");
        tree.setName(plant.getName());
        tree.setLifeSpan(plant.getLifeSpan());
        tree.setHeight(3.565f);
        System.out.println("Tree Name:"+tree.getName());
        System.out.println("Tree Height:"+tree.getHeight());
        System.out.println("Tree LifeSpan"+tree.getLifeSpan());
        System.out.println("Tree toString:"+tree.toString());

        System.out.println("\n\nFlower DETAILS\n");
        Flower flower=new Flower();
        System.out.println("Testing Flower Setter and Getter and toString Methods");
        flower.setName("Rose Flower");
        flower.setLifeSpan("2days");
        flower.setColor("Red");
        System.out.println("Flower Name:"+flower.getName());
        System.out.println("Flower Lifespan:"+flower.getLifeSpan());
        System.out.println("Flower Color:"+flower.getColor());
        System.out.println("Flower toString:\n"+flower.toString());
    }
}

output:

Plant DETAILS

Testing Plant Setter and Getter and toString Methods
Plant Name:Rose
Plant LifeSpan:2Years
Plant toString:
   Name:Rose
   LifeSpan:2Years

TREE DETAILS

Testing Tree Setter and Getter and toString Methods
Tree Name:Rose
Tree Height:3.565
Tree LifeSpan2Years
Tree toString:
  
   Name:Rose
   LifeSpan:2Years
   Height:3.565

Flower DETAILS

Testing Flower Setter and Getter and toString Methods
Flower Name:Rose Flower
Flower Lifespan:2days
Flower Color:Red
Flower toString:

  
   Name:Rose Flower
   LifeSpan:2days
   Color:Red