// This is the interface that each of your Box classes will implement.

// As you can see, this interface allows different kinds of boxes to

// store and return their volume and weight using any class types.

interface Parcel {

public VolumeType getVolume();

public WeightType getWeight();

}

// TODO: implement the MetricBox class below to:

// 1) correctly implement the Parcel interface above

// 2) force the volume and weight returned from any MetricBox to be type Double

// 3) enable the checks in the main method below to compile and run

class MetricBox {}

// TODO 2/3: implement the EnglishBox class below to:

// 1) correctly implement the Parcel interface above

// 2) force the volume returned from any EnglishBox to be type String, but

// allow the weight to be different for different EnglishBoxes

// 3) enable the checks in the main method below to compile and run

class EnglishBox {}

// TODO 3/3: implement the UniformBox class below to:

// 1) correctly implement the Parcel interface above

// 2) force the weight and volume retrieved from any UniformBox to be of a single

// consistent generic type: so that the volume and weight cannot be different types

// 3) enable the checks in the main method below to compile and run

class UniformBox {}

public class GenericsActivity {

public static void main(String[] args) {

String typesChecked = "";

// Checks for the MetricBox type:

// Parcel m = new MetricBox(3.0,4.0);

// if( !(m.getVolume().toString()+m.getWeight().toString()).equals("3.04.0") )

// System.out.println("m does not include expected contents.");

// typesChecked += "MetricBox ";

// Checks for the EnglishBox type:

// Parcel e1 = new EnglishBox<>("large",5);

// if( !(e1.getVolume().toString()+e1.getWeight().toString()).equals("large5") )

// System.out.println("e1 does not include expected contents.");

// Parcel e2 = new EnglishBox<>("medium","heavy");

// if( !(e2.getVolume().toString()+e2.getWeight().toString()).equals("mediumheavy") )

// System.out.println("e2 does not include expected contents.");

// typesChecked += "EnglishBox ";

// Checks for the UniformBox type:

// Parcel u1 = new UniformBox<>(6.0f, 2.0f);

// if( !(u1.getVolume().toString()+u1.getWeight().toString()).equals("6.02.0") )

// System.out.println("u1 does not include expected contents.");

// Parcel u2 = new UniformBox<>("small","light");

// if( !(u2.getVolume().toString()+u2.getWeight().toString()).equals("smalllight") )

// System.out.println("u2 does not include expected contents.");

// typesChecked += "UniformBox ";

System.out.println("Checks complete for: "+typesChecked);

}

}