Question 1

Handling a possible illegal operation with a try and catch block will make the code run faster than handling it with a simple if/else construct.

Accepted Answer

Using try/catch blocks can introduce overhead due to exception handling mechanisms, potentially making the code slower compared to using a simple if/else construct for predictable conditions.

Question 2

Java does not allow objects to be written to or read from a file.

Accepted Answer

Java allows objects to be written to or read from a file using serialization, which involves converting an object into a byte stream and vice versa.

Question 3

When an object is written to a file, transient instance variables of that object are not written to the file.

Accepted Answer

Transient instance variables are not serialized, meaning they are not saved when an object is written to a file.

Question 4

Java provides classes and methods to read data from a remote file (located somewhere on the Internet).

Accepted Answer

Java provides classes such as `URL` and `URLConnection` in the `java.net` package, which can be used to read data from a remote file over the Internet.

Question 5

Exceptions occur at __________.

Accepted Answer

The answer of Exceptions occur at __________....

Question 6

The class Scanner can be used to __________ a string.

Accepted Answer

The answer of The class Scanner can be used to...

Question 7

For an object of a class to be written to a file, that class must implement the __________ interface.

Accepted Answer

The answer of For an object of a class to...

Question 8

The __________ class encapsulates the concept of a Uniform Resource Locator.

Accepted Answer

The answer of The __________ class encapsulates the concept of...

Question 9

__________ formatting is made up of two data structures: key/value pairs and arrays.

Accepted Answer

The answer of __________ formatting is made up of two...

Question 10

Because the readObject method returns a generic object, what must the returned object be?

Accepted Answer

The answer of Because the readObject method returns a generic...

Question 11

Tyler wrote a code that includes multiple catch blocks to catch files not found and characters that are not integers. Predict what will happen if a user enters an invalid file and also enters a 1.5 for the integer.

Accepted Answer

The answer of Tyler wrote a code that includes multiple...

Question 12

How can the methods of the Exception class be useful?

Accepted Answer

The answer of How can the methods of the Exception...

Question 13

When we read objects from a file using the readObject method, what happens when the end of the file is reached?

Accepted Answer

The answer of When we read objects from a file...

Question 14

You want to handle a suspected exception in your program, so you insert the following try and catch blocks. However, the program generated a compiler error. Improve this program to avoid that problem.
1
2 try
3 {
4 n = Integer.parseInt( s );
5 System.out.println( "Conversion was successful." );
6 catch ( NumberFormatException nfe )
7 System.out.println( "Sorry. incompatible data." );
8 System.out.println( "
Output from getMessage: 
"
9 + nfe.getMessage( ) );
10
11 System.out.println( "
Output from toString: 
"
12 + nfe.toString( ) );
13 System.out.println( "
Output from printStackTrace: " );
14 nfe.printStackTrace( );
15 }

Accepted Answer

The answer of You want to handle a suspected exception...

Question 15

Suppose you write a program using the Scanner class to read data from a text file. The file is not found, but the code instantiating the Scanner was inside a try block. Predict what will happen, and explain why this is advantageous.

Accepted Answer

The answer of Suppose you write a program using the...

Question 16

Evaluate what will happen if you run a program that attempts integer division by 0.

Accepted Answer

The answer of Evaluate what will happen if you run...

Question 17

What is the purpose of the following code segment?
13 String flightRecord1 = "AA123,BWI,SFO,235,239.5";
14 Scanner parse = new Scanner( flightRecord1 );
15 // set the delimiter to a comma
16 parse.useDelimiter( "," );

Accepted Answer

The answer of What is the purpose of the following...

Quiz 11: Exceptions, and Input Output Operations