What does the following code output? String input = "1 fish 2 fish red fish blue fish"; Scanner s = new Scanner(input).useDelimiter("\\s*fish\\s*"); System.out.println(s.nextInt()); System.out.println(s.nextInt()); System.out.println(s.next()); System.out.println(s.next()); s.close();

1 fish 2 fish red fish blue fish

When using a scanner object with a string you are usually trying to:

break the string into separate parts

break an integer into its factors

What will happen when the code below is run? Scanner userInput = new Scanner (System.in); System.out.println ("How old are you?"); int age = userInput.nextInt(); System.out.println (age + " is a very good age to be!"); The user enters "Sixteen".

Exception (user has entered the wrong data type).

"Sixteen is a very good age to be!"gets displayed.

"16 is a very good age to be!"gets displayed.

The correct way to try to catch an input error is:

try { // input statement } catch ( InputMismatchException e) { // display error message to user }

try { // display message to user } catch ( InputMismatchException e) { // input statement }

try { // input statement } catch ( DataMismatchException e) { // display error message to user }

try { // display message to user } catch ( DataMismatchException e) { // input statement }

String example= "10810/=10/8/10/= a cannibal's name!"; Scanner stringParser = new Scanner(example); System.out.println("Boolean Result: "+stringParser.hasNextBoolean()); stringParser.useDelimiter("/"); while(stringParser.hasNext()) { System.out.println(stringParser.next()); } System.out.println("Delimiter used: " +scanner.delimiter()); scanner.close(); Select ALL TRUE statements.

The code displays 7 lines of text

The code displays 6 lines of text

Before you can use scanner to read data from a text file you need to: Select ALL valid answers

Instantiate a new Scanner object.

Use the correct File object name in the Scanner constructor.

Make sure you use the correct file name in the File object constructor.

Use the correct file name in the Scanner constructor.

The correct way to link a Scanner to a file is:

pupilData = new File ("pupildata.txt"); fileScanner = new Scanner (pupilData);

pupilData = new File ("pupildata.txt"); fileScanner = new Scanner ("pupilData.txt");

pupilData = new File ("pupildata.txt"); fileScanner = new File ("pupilData.txt");

pupilData = new File ("pupildata.txt"); fileScanner = new File(pupilData);

String lyricString = "The rain * in Spain * falls mainly * on the plains." The correct way to break this string into parts and display each part on a new line is:

lineScanner = new Scanner (lyricString); lineScanner.useDelimiter( "*" ); while (lineScanner.hasNext()) { String part = lineScanner.next(); System.out.println(part); }

lineScanner = new Scanner (lyricString); lineScanner.useDelimiter( "," ); while (lineScanner.hasNext()) { String part = lineScanner.next(); System.out.println(part); }

lineScanner = new Scanner (lyricString); lineScanner.useDelimiter( "*" ); while (lineScanner.hasNext()) { String part = lineScanner.next(); System.out.print(part); }

lineScanner = new Scanner (lyricString); lineScanner.useDelimiter( "," ); while (lineScanner.hasNext()) { String part = lineScanner.next(); System.out.print(part); }

Four learners have come to you asking with help with their code to read lines of text from a file and display them as seperate lines of text on the screen. One of them has the right answer. Who is it?

"Cat" Stevens File dataFile = new File( "data.txt" ); Scanner fileScanner = new Scanner(dataFile); while (fileScanner.hasNextLine()) { String line = fileScanner.nextLine(); System.out.println (line); }

Fiona Apple File File = new File( "data.txt" ); Scanner fileScanner = new Scanner(file); while (fileScanner.hasNextLine()) { String line = canner.nextLine(); System.out.println (line); }

Sipho "Hotstix"Mabuse File dataFile = new File( "data.txt" ); Scanner scanner = new Scanner(datafile); while (scanner.hasNextLine()) { String line = scanner.nextLine(); system.out.println (line); }

Brenda Fassi File dataFile = new File( "data.txt" ); Scanner filescanner = new Scanner(dataFile); while (scanner.hasNextLine()) { String line = fileScanner.nextLine(); System.out.println (line); }

The hasNextxxx methods of the Scanner class are meant to...

Return a Boolean value to show if the next section of input is present AND is of the correct type.

Return a Boolean value to show if the next section of input is of the correct type.

Return a Boolean value to show if the next section of input is present.

Return a allow the programmer to read data from the input source.

Because the hasNextxxx methods of the Scanner class check for the presence (and type) of input data they are ideal for: (Choose ALL the correct options)

Making decisions about whether to accept the input.

Being the key changeable element in a loop for accepting input.

Defensive programming techniques.

Letting the user control the type of input.

The best way to prevent data type mismatch errors and get the correct data type without using a Try Catch block is:

Scanner userInput = new Scanner (System.in); Boolean validInput = false; while (!validInput) { System.out.println ("Please input a number:"); if (userInput.hasNextInt()) { int no = userInput.nextInt(); System.out.println ("Well done! The number you entered is "+ no); validInput = true; } else { String wrong = new String (userInput.nextLine()); System.out.println ("Error! You were meant to type in a number, instead you typed in : " + wrong); } }

Scanner userInput = new Scanner (System.in); System.out.println ("Please input a number:"); if (userInput.hasNextInt()) { int no = userInput.nextInt(); System.out.println ("Well done! The number you entered is "+ no); } else { String wrong = new String (userInput.nextLine()); System.out.println ("Error! You were meant to type in a number, instead you typed in : " + wrong); }

Java Scanner Library

10th - 12th Grade

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Practice Problem

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Hard

Used 107+ times

FREE Resource

31 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To read input from the user the scanner object must accept _______________ as a constructor.

System.in

A string

A file name

A file object

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which correctly creates a scanner object?

Scanner objectName = Scanner ();

Scanner objectName = new Scanner ();

Scanner objectName = Scanner (System.in);

Scanner objectName = new Scanner (System.in);

MULTIPLE SELECT QUESTION

30 sec • 1 pt

The Scanner method used to read a string value from the user is: (tick ALL correct options)

next()

nextString()

nextLine()

Next()

NextLine()

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scanner can get a whole number from the user using:

next()

nextInterger()

nextInt()

readInt()

readInteger()

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

To read input from a data file the scanner object must accept _______________ as a constructor.

System.in

A string

A file name

A file object

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

nextDouble is used to read in:

Whole number

Number with a decimal point

Text

A True / False value

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The purpose of hasNextInt is:

to check that the input is a Whole number

to check that the input is a number with a decimal point

to check that the input is text

to check that the input is a True / False value

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Java Scanner Library

31 questions

To read input from the user the scanner object must accept _______________ as a constructor.

Which correctly creates a scanner object?

The Scanner method used to read a string value from the user is: (tick ALL correct options)

Scanner can get a whole number from the user using:

To read input from a data file the scanner object must accept _______________ as a constructor.

nextDouble is used to read in:

The purpose of hasNextInt is:

To use the scanner class you need to import

In the code below the variable xyz must be of type:

myFile = new File ("myfile.txt");
try{
myFileScanner = new Scanner (myFile);
while (myFileScanner.hasNextLine () ) {
xyz = scanner.nextLine ();
}
}

The Scanner can only work with user input.

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Discover more resources for Computers

Java Scanner Library

31 questions

To read input from the user the scanner object must accept _______________ as a constructor.

Which correctly creates a scanner object?

The Scanner method used to read a string value from the user is: (tick ALL correct options)

Scanner can get a whole number from the user using:

To read input from a data file the scanner object must accept _______________ as a constructor.

nextDouble is used to read in:

The purpose of hasNextInt is:

To use the scanner class you need to import

In the code below the variable xyz must be of type:myFile = new File ("myfile.txt");try{ myFileScanner = new Scanner (myFile); while (myFileScanner.hasNextLine () ) { xyz = scanner.nextLine (); }}

The Scanner can only work with user input.

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In the code below the variable xyz must be of type:

myFile = new File ("myfile.txt");
try{
myFileScanner = new Scanner (myFile);
while (myFileScanner.hasNextLine () ) {
xyz = scanner.nextLine ();
}
}