Question

Which four of the following statements are true? Generic code only works with values of reference types. Autoboxing is when a reference type is automatically converted into the corresponding primitive type. Java will always add a default constructor to any class that you define All exceptions in Java implement the Thwable interface Generic algorithms allow you to write code that can operate on arguments of multiple different types. The type wrapper for the int primitive type is called Int A class called Pair<ct, v> has two type parameters. A rloat is a 64-bit floating-point type. QUESTION 5 Which of the following statements about Java I/O streams is true? OVO streams are only useful for reading to /writing from files on disk. Character streams are built upon byte streams You can read or write arbitrary objects using a DataSream. Byte streams are built upon character streams

Answer 1

Answer 4:

True statements are:

1. Generic code only works with values of reference types.

3. Java will always add a default constructor to any class that you define.

5. Generic algorithms allow you to write code that can operate on argument of multiple different types.

7. A class called Pait<T, V> has two type parameters.

Explanation:

2. Autoboxing is when a reference type is automatically converted into the corresponding primitive type. - False because Autoboxing converts primitive types into wrapper objects and auto-unboxing takes place when an object is to be converted into a primitive type.  

4. All exceptions in java implements the Throwable interface. - False because Throwable is a class that is extend.

6. The type wrapper for the int primitive type is called Int. - False because its Integer.

8. A float is a 64-bit floating point type. - False because it is a single-precision 32-bit IEEE 754 floating point.

Answer 5:

True statement is:

1. I/O streams are only useful for reading to/ writing from file on disk.

Explanation:

All other byte streams in Java are built on top of the basic InputStream and OutputStream . Reader , Writer. Abstract classes that define the basic functionality for reading or writing a sequence of character data, with support for Unicode. All other character streams in Java are built on top of Reader and Writer .

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