Answered: this code is in java. Explore the given classes. Implement a getter method on the WasteRobot class with the following method signature public ArrayList…

Database System Concepts

7th Edition

ISBN: 9780078022159

Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher: McGraw-Hill Education

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

Question

this code is in java.

Explore the given classes. Implement a getter method on the WasteRobot class with the following method signature

public ArrayList<Waste> getWasteBin(String wasteType)

The method should return the proper waste bin based on the passed wasteType. Compare the given wasteType to each of the public static final constants in the Waste class to help determine which bin to return.

Given Classes :

WasteRobotTester.java

import java.util.*;

public class WasteRobotTester
{
public static void main(String[] args)
{
WasteRobot wallie = new WasteRobot();

// Your test code.
}
}

WasteRobot.java

import java.util.*;

public class WasteRobot
{
private ArrayList<Waste> trashBin;
private ArrayList<Waste> compostBin;
private ArrayList<Waste> recyclingBin;

public WasteRobot()
{
trashBin = new ArrayList<Waste>();
compostBin = new ArrayList<Waste>();
recyclingBin = new ArrayList<Waste>();

trashBin.add(new Trash("Plastic Bag"));
compostBin.add(new Compost("Banana Peel"));
recyclingBin.add(new Recycling("Soda Can"));
}

// Implement this!
// getWasteBin(String wasteType)

}

Waste.java

public abstract class Waste
{
public static final String TRASH_TYPE = "trash";
public static final String COMPOST_TYPE = "compost";
public static final String RECYCLING_TYPE = "recycling";

private String wasteType;
private String wasteName;

public Waste(String wasteType, String wasteName) {
this.wasteType = wasteType;
this.wasteName = wasteName;
}

public String getWasteType()
{
return wasteType;
}

public String toString()
{
return wasteType + ": " + wasteName;
}
}

Trash.java

public class Trash extends Waste
{
public Trash(String wasteName)
{
super(Waste.TRASH_TYPE, wasteName);
}
}

Recycling.java

public class Recycling extends Waste
{
public Recycling(String wasteName)
{
super(Waste.RECYCLING_TYPE, wasteName);
}
}

Compost.java

public class Compost extends Waste
{
public Compost(String wasteName)
{
super(Waste.COMPOST_TYPE, wasteName);
}
}