Programming

What is the value of x after the following statements are executed? int x = 0; int y = 10; x = y++;

10

What is the value of x after the following statements are executed? int x = 0; int y = 10; x = ++y;

11

The value of x after the following statements execute is _____. int x = 15; int y = 10; x += y;

25

The result of the following expression is _____. 6 + 2 * 3 - 4

8

Which of the following comprises less serious errors that represent unusual conditions that arise while a program is running, and from which the program can recover?

Exception Class

If a method throws an Exception that will be caught, you must also use the keyword throws, followed by a(n) _____ in the method header.

Exception Type

T/F: A method can also return nothing, in which case the return type is null.

False

T/F: A programmer can declare methods outside a Java class.

False

T/F: The parameter type in the following method is double. public static double getAmount(int ID) {...}

False

True/False: In Java, there is one basic class of errors: Exception.

False

True/False: When a Thread is in the ready state, isAlive() returns true.

False

True/False: When you have actions you must perform at the end of a try... catch sequence, you can use a catch block.

False

True/False: When you run a Java program, the runnable Thread with the lowest priority runs first.

False

True/False: You can place as many place as many statements as you need within a try block; only the last error-generating statement throws an exception.

False

True/False: You must include the statement java.import in any program that uses the file class.

False

When a Thread completes the execution of its run() method, its state is _____.

Inactive

To create standard dialog boxes, you use _____.

JOptionPane

When you create a thread, which state would it be in?

New

The File class is a direct descendant of the _____.

Object class

The input dialog box returns a(n) _____.

String

To exit a program successfully, you use _____.

System.exit(0);

T/F: Encapsulation means putting data and related methods in a self-contained class.

True

T/F: To store a value explicitly as a float, you can type the letter F after the number.

True

True/False: An exception is an unexpected or error condition.

True

True/False: Computer users use the term file to describe the objects that they store on permanent storage devices.

True

True/False: If you do not assign a priority to a Thread object it assumes a default priority of 5.

True

True/False: InputStream and OutputStream are abstract classes that contain methods for performing input and output.

True

True/False: Multithreaded programs often run slower.

True

True/False: When you create a segment of code in which something might go wrong, you place the code in a try block.

True

True/False: You use the File class to obtain information about a file, such as whether it exists or is open, its size, and its last modification date.

True

Choose the statement that is similar to the following. if (X > Y) Z = X; else Z = Y;

Z = (X > Y) ? X : Y;

Which of the following is not an element of the try block?

a catch

What is the output of the following code segment? int a = 45; do { System.out.println("a++ = " + a++); } while (a > 100);

a++=45

The read() method in the following statement reads a(n) _____. System.in.read();

byte

The Error class represents errors which your program usually _____.

cannot recover from

A ----- block is a segment of code that can handle an Exception that might be thrown by the try block that precedes it. Each ----- block can "-----" one type of Exception. A ----- block looks a lot like a -----( ) method that takes an argument that is some type of Exception. However, it is not a method; it has no return type, and you can't call it directly.

catch

Any ArithmeticException generated within the try block in the program would be caught by the _______.

catch block

An example of a primitive data type is _____.

char

A method body is included within _____.

curly braces

The situation when two Threads are waiting for each other to do something before either can progress is called _____.

deadlock

An exception is an ----- that occurs during the execution of a program that ----- the normal flow of instructions.

event, disrupts

T/F: The body of a while loop is executed at least once.

false

T/F: The following loop has a(n) infinite body.while(loopCount > 20);

false

The value of compare1 after the following statements are executed is _____. int x = 249; int y = 250; boolean compare1 = (x++ = = y);

false

When you have actions you must perform at the end of a try...catch sequence, you can use a ------ block. The code within a ------ block executes whether or not the preceding try block identifies Exceptions. Usually, you use a ------ block to perform clean-up tasks that must happen whether or not any Exceptions occurred, and whether or not any Exceptions that occurred were caught.

finally

You can use the ----------( ) method that ArithmeticException inherits from the Throwable class. To retrieve Java's message about any Throwable Exception named someException, you code someException.getMessage().

getMessage

If you are writing applet classes and you need to use threads, you would _____.

implement the runnable interface

Where is the Thread class defined?

java.lang

What is the output of the following code segment? int n = 5; int i; for (i=0; i < 10; i++); n += i; System.out.println("n = " + n);

n=15

Each catch block can "catch" how many types of Exceptions?

one type

Which one of the following modifiers has the lowest level of security?

public

When you write a method that might throw an Exception, you can type the clause ------ after the method header to indicate the type of Exception that might be thrown.

throws <name>Exception

What is the output of the following code segment? int x = 0; int i, j; for (i = 0; i < 10; i++) for (j = 10; j > 4; j--) x += 1; System.out.println("x = " + x);

x=60