Which code sample will output "Hello World" with each word on a separate line?

System.out.print("Hello\nWorld");

System.out.print("Hello" + "World");

System.out.println("Hello World");

System.out.print("Hello"); System.out.println("World");

Which of the following assigns a value to the variable var?

System.out.println("var = value");

How to you create a new Scanner object to get user input from the console?

Scanner input = new Scanner(System.in);

Scanner input = Scanner.System.in;

Scanner input = new Scanner(console);

If you use one of the next() methods to retrieve a numeric data type, what can you do to clear any newline (\n) the user may have entered from the input stream?

Call the same next() method again

The next() methods will clear all newlines, so nothing else needs to be done

What happens if you call Scanner.nextInt() and the user has entered “abc”?

Your program will throw an exception

You will receive the default value (0) for the data type

The Scanner will automatically wait until the user enters a valid number

The system will automatically prompt the user for a valid number

What might you want to do before calling one of the Scanner input methods?

Print a message to the console so the user knows what to do

Print out a newline character (\n) so the user doesn’t have to press Enter

Why is it important to validate any expected parameters from the command-line?

Your program may encounter an exception if you try to use a parameter that does not exist in the args array

The JVM will add empty strings if there are not enough parameters

Your program may crash if there are too many parameters

Because the “args” variable could be null

If the user enters data "awesome" when you prompt for a number, what will happen when you call nextInt() to read the data?

Your program will get an InputMismatchException

Your program will get a NullReferenceException

You will get a default 0 value if the data can't be parsed

You will get some numeric value that represents the character 'a'

What should you remember to do after using any combination of the hasNext() and next() functions?

Call nextLine() to clear the newline from the input stream

Nothing special needs to be done

What do you need to do after a hasNextDouble() function returns false, meaning the user has entered something other than a double value?

Call next() to read the unexpected data from the stream as a String

Keep calling hasNextDouble() until the user enters correct data

Which line of code will result in myInt = 42 ?

int myInt = Integer.parseInt ("42");

int myInt = Integer("42").toString();

int myInt = Integer.toString("42");

Which line of code will result in myString = "1.7320508" ?

String myString = Double.toString(1.7320508);

String myString = Double.convert(1.7320508);

String myString = String.format(1.7320508);

String myString = Double("1.7320508");

What is the default value of a reference variable after it is declared?

Random junk until you initialize it

How would you declare and initialize a primitive wrapper class for the double data type that contains the value 1.0?

Double myDouble = new Double(1.0);

Java - Ch. 1 - 6 Review

Authored by Colleen Chattaway

Computers

9th - 12th Grade

Used 30+ times

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95 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

If a program “Tester” is run from the command line as shown below, what is the value of args[0]?
java Tester sing a song

"sing a song"
"sing a song"

"song"
"song"

"a "

"sing"

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Logic errors are easily identified when a program is compiled.

True

False

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Although not a requirement, it is Java standard that class identifiers begin with an uppercase letter and use other uppercase letters to improve readability.

True

False

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.

True

False

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A compiler ignores whitespace between words and lines.

True

False

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.

True

False

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Using the void keywords in the main( ) method header indicates that a value will be returned by the main( ) method is called.

True

False

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Java - Ch. 1 - 6 Review

If a program “Tester” is run from the command line as shown below, what is the value of args[0]?
java Tester sing a song

Logic errors are easily identified when a program is compiled.

Although not a requirement, it is Java standard that class identifiers begin with an uppercase letter and use other uppercase letters to improve readability.

Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.

A compiler ignores whitespace between words and lines.

You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.

Using the void keywords in the main( ) method header indicates that a value will be returned by the main( ) method is called.

A Java identifier can contain only letters, digits, & , or number signs (pound signs).

If an object's methods are well written, the user is unaware of the low-level details of how the methods are executed, and the user must simply understand the interface or interaction between the method and the object.

System software is used for tasks such as word processing, calculations and playing games.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Computers

Java - Ch. 1 - 6 Review

If a program “Tester” is run from the command line as shown below, what is the value of args[0]?java Tester sing a song

Logic errors are easily identified when a program is compiled.

Although not a requirement, it is Java standard that class identifiers begin with an uppercase letter and use other uppercase letters to improve readability.

Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.

A compiler ignores whitespace between words and lines.

You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.

Using the void keywords in the main( ) method header indicates that a value will be returned by the main( ) method is called.

A Java identifier can contain only letters, digits, & , or number signs (pound signs).

If an object's methods are well written, the user is unaware of the low-level details of how the methods are executed, and the user must simply understand the interface or interaction between the method and the object.

System software is used for tasks such as word processing, calculations and playing games.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Computers

If a program “Tester” is run from the command line as shown below, what is the value of args[0]?
java Tester sing a song