Java Chapter 12 Questions and Answers Graded A+

Java Chapter 12 Questions and Answers
Graded A+
What is the main purpose of Java generics?

A) To make code execute faster


✔✔B) To provide type safety and eliminate the need for explicit casting


C) To allow multiple inheritance

D) To improve garbage collection




Which syntax correctly defines a generic class?

A) `class Box<T> { }`


✔✔B) `class Box<T> { private T item; }`


C) `class <T> Box { }`

D) `class Box { T item; }`




What is the advantage of using bounded type parameters in generics?


✔✔A) They restrict the types that can be used as arguments


B) They make the program run faster

C) They remove the need for constructors

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,D) They allow access to private fields of other classes




Which wildcard allows any type to be passed to a method?

A) `<T>`


✔✔B) `<?>`


C) `<? extends T>`

D) `<? super T>`




Which of the following correctly defines a generic method?


✔✔A)


```java

public <T> void print(T value) {

System.out.println(value);

}

```

B)

```java

public void print<T>(T value) {


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, System.out.println(value);

}

```

C)

```java

public T print(T value) {

System.out.println(value);

}

```

D)

```java

public void print(T value) {

System.out.println(value);

}

```




Which of the following correctly declares a generic interface?


✔✔A) `interface DataContainer<T> { T getData(); }`



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