Submit quiz 7

assignments/quiz1.md

@@ -101,7 +101,7 @@
 >
 > 1. a private field called `setHeight` that is a `double` data type
 > 2. a public method with a parameter of data type `double` that does not return
-     a value
+    a value
 > 3. a public field called `setHeight` that is a `double` data type
 > 4. a private method with no parameters that returns a `double` data type
 

assignments/quiz7.md

@@ -14,3 +14,144 @@
 - Restrictions of the Use of Generic Types
 
 ## Problem 1
+
+> A generic class
+>
+> 1. may create instances of any of its type parameters
+> 2. may not create instances of any of its type parameters
+> 3. may not implement interfaces that are generic
+> 4. None of the above
+
+**B**. may not create instances of any of its type parameters
+
+## Problem 2
+
+> Let `Point<T>` be a generic type. We want to write a method that takes as
+  parameter `Point` objects whose type parameter is the `Number` class, or any
+  subclass of `Number`. We can do this by declaring the type of the method
+  parameter as
+>
+> 1. `Point<Number>`
+> 2. `Point<? super Number>`
+> 3. `Point<? extends Number>`
+> 4. `Point<? sub Number>`
+
+**C**. `Point<? extends Number>`
+
+## Problem 3
+
+> Which of the following statements are true?
+>
+> 1. You cannot instantiate an object of a generic type
+> 2. You cannot create arrays whose elements are instances of a generic type
+> 3. You can declare references to arrays whose elements are of a generic type
+> 4. All of the above
+
+**C**. You can declare references to arrays whose elements are of a generic type
+
+## Problem 4
+
+> Erasure is the process of
+>
+> 1. removing references to generic interfaces during execution
+> 2. returning the null value when the compiler cannot determine the value of a
+    generic reference
+> 3. replacing generic types with their upper bound, or with Object, during
+    compilation
+> 4. deleting generic types that cannot be correctly resolved during compilation
+
+**C**. replacing generic types with their upper bound, or with Object, during
+    compilation
+
+## Problem 5
+
+> Let `Point<T>` be a generic type. We want to write a method that takes as
+  parameter `Point` objects whose type parameter is the `Number` class, or any
+  superclass of `Number`. We can do this by writing
+>
+> 1. `Point<Number>`
+> 2. `Point<? super Number>`
+> 3. `Point<? extends Number>`
+> 4. `Point<? sub Number>`
+
+**B**. `Point<? super Number>`
+
+## Problem 6
+
+> The automatic conversion of a primitive type to the corresponding wrapper type
+  when being passed as parameter to a generic class is called
+>
+> 1. type promotion
+> 2. type wrapping
+> 3. autoconversion
+> 4. autoboxing
+
+**D**. autoboxing
+
+## Problem 7
+
+> The code fragment
+>
+> ```java
+> class MySArrayList extends ArrayList<String> {
+> }
+> ```
+>
+> 1. is a correct way to extend a class
+> 2. is incorrect because there is no type variable
+> 3. is incorrect because it is missing the wildcard symbol
+> 4. None of the above
+
+**A**. is a correct way to extend a class
+
+## Problem 8
+
+> An advantage of using generic types is
+>
+> 1. lower compile-time overhead
+> 2. increased portability of Java programs
+> 3. increased type-safety without the need to do typecasts at run time
+> 4. faster execution of programs that use generics
+
+**C**. increased type-safety without the need to do typecasts at run time
+
+## Problem 9
+
+> Consider the class
+>
+> ```java
+> class Value<T extends Number> {
+>   private T v;
+>   public Value(T v1) {
+>     v = v1;
+>   }
+>   public void output() {
+>     System.out.println(v);
+>   }
+> }
+> ```
+>
+> The code
+>
+> ```java
+> Value<Number> nV1 = new Value<Double>(34.5);
+> ```
+>
+> 1. will cause a compiler error
+> 2. will compile correctly, but cause an exception at run time
+> 3. will compile and run correctly
+> 4. None of the above
+
+**A**. will cause a compiler error
+
+## Problem 10
+
+> The process used by the Java compiler to remove generic notation and
+  substitute actual type arguments for formal type parameters is called
+>
+> 1. erasure
+> 2. removal
+> 3. substitution
+> 4. masking
+
+**A**. erasure