Question

In STS, create Java Project, called java_generics_yourNameLastname that;

(Under source directory called, src, create a package csci3444.generics and put all code in it)

1. Create a generic interface called “MyGenInterface” that takes 2 generic types K,V with below methods;

public K getKey();

public V getValue();

2. Create a generic class called “MyGenClass” that implements “MyGenInterface” interface.
   1. has attributes “K key” and “V value” that can be inherited
   2. has a constructor that takes “K _key”, “V _value” inputs and initializes “key”, “value” attributes
   3. has implementation of “getKey” and “getValue” methods returning “key” and “value” respectively.
3. Create a regular class “MyRegularClass” with a public static generic method called “getSum” that
   1. takes T generic class that can be children of java’s Number class
   2. takes 2 inputs of “T inp1”, “T inp2”
   3. returns type T inp1

4. Create class called MainEntry that
   1. has a static main method
   2. in main method, create local variables;
      1. mgi1 of type MyGenInterface that takes Integer and String as K,V
      2. mgi2 of type MyGenInterface that takes Integer and Integer as K,V
      3. Initialize mgi1 to instance of MyGenClass with inputs

(1, “yourName”)

4. Initialize mgi2 to instance of MyGenClass with inputs

(1, 2017)

5. Integer i1 set to returned value from MyRegularClass’ getSum method passing (10,20)
6. Float f1 set to returned value from MyRegularClass’ getSum method passing (100f,200f)

3. In main method, have a System.out.println statement that prints key and value of mgi1 and mgi2 instances
4. In main method, have a System.out.println statement that prints i1 and f1

Answer 1

Answer:

Please find the below code according to the given requirements.

=======================================================

MyGenInterface.java

======================================================

package csci3444.generics;

/*
* a generic interface called “MyGenInterface” that takes 2 generic types K,V
*/
public interface MyGenInterface<K, V> {

   public K getKey();

   public V getValue();

}

=====================================================

MyGenClass.java

=====================================================

package csci3444.generics;

/*
* a generic class called “MyGenClass” that implements “MyGenInterface” interface.
*/
public class MyGenClass<K, V> implements MyGenInterface<K, V> {

   private K key;
   private V value;

   /**
   * a constructor that takes “K _key”, “V _value” inputs and initializes “key”,
   * “value” attributes
   *
   * @param key
   * @param value
   */
   public MyGenClass(K _key, V _value) {
       key = _key;
       value = _value;
   }

   /**
   * @return K returns key K
   */
   @Override
   public K getKey() {
       return key;
   }

   /**
   * @return V return value V
   */
   @Override
   public V getValue() {
       return value;
   }

}

==================================================

MyRegularClass.java

==================================================

package csci3444.generics;

/*
* a regular class “MyRegularClass”
*/
public class MyRegularClass {

   /*
   * generic method called “getSum” that takes 2 inputs of “T inp1”, “T inp2”
   */
   public static <T> T getSum(T inp1, T inp2) {
       return inp1;
   }

}

========================================================

MainEntry.java

========================================================

package csci3444.generics;

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

       // local variable:mgi1 of type MyGenInterface that takes Integer and String as K,V

       MyGenInterface<Integer, String> mgi1;

       // local variable:mgi2 of type MyGenInterface that takes Integer and Integer as K,V
       MyGenInterface<Integer, Integer> mgi2;

       //Initialize mgi1 to instance of MyGenClass with inputs (1, “yourName”)
       mgi1 = new MyGenClass<>(1, "John");
       ////Initialize mgi2 to instance of MyGenClass with inputs (1, 2017)
       mgi2 = new MyGenClass<>(1, 2017);

       //Integer i1 set to returned value from MyRegularClass’ getSum method passing (10,20)
       Integer i1 = MyRegularClass.getSum(10, 20);
       //Float f1 set to returned value from MyRegularClass’ getSum method passing (100f,200f)
       Float f1 = MyRegularClass.getSum(100f, 200f);

       System.out.println("mgi1 Key: " + mgi1.getKey() + ", Value: " + mgi1.getValue());
       System.out.println("mgi2 Key: " + mgi2.getKey() + ", Value: " + mgi2.getValue());

       System.out.println("i1: " + i1);
       System.out.println("f1: " + f1);

   }

}

Sample output:

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