Using Scanner class in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a Scanner object to read input from the keyboard.

Java

Scanner scanner = new [1](System.in);

Drag options to blanks, or click blank then click option'

AInputStream

BScanner

CSystem

DBufferedReader

Attempts:

3 left

💡 Hint

Common Mistakes

Using InputStream instead of Scanner to create the object.

Trying to use System directly as a class to create Scanner.

The Scanner class is used to read input from various sources. To read from the keyboard, you create a Scanner object with System.in as the input stream.

2fill in blank

medium

Complete the code to read an integer value from the user using Scanner.

Java

int number = scanner.[1]();

Drag options to blanks, or click blank then click option'

AnextInt

BnextLine

CnextDouble

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() which reads a whole line as a string.

Using nextDouble() when expecting an integer.

To read an integer from the user, use the nextInt() method of Scanner.

3fill in blank

hard

Fix the error in the code to read a string input from the user.

Java

String name = scanner.[1]();

Drag options to blanks, or click blank then click option'

AnextIntLine

BnextDouble

CnextInt

DnextLine

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextInt() or nextDouble() which expect numbers.

Using a non-existent method like nextIntLine().

To read a whole line of text including spaces, use nextLine(). Other methods read tokens or numbers.

4fill in blank

hard

Fill both blanks to read a double value and then close the Scanner.

Java

double value = scanner.[1]();
scanner.[2]();

Drag options to blanks, or click blank then click option'

AnextDouble

Bclose

CnextInt

DnextLine

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextInt() instead of nextDouble() for double values.

Forgetting to close the Scanner.

Use nextDouble() to read a double value. Always close the Scanner with close() to free resources.

5fill in blank

hard

Fill all three blanks to read a string, an integer, and then print them.

Java

String name = scanner.[1]();
int age = scanner.[2]();
System.out.println([3] + ": " + age);

Drag options to blanks, or click blank then click option'

AnextLine

BnextInt

Cname

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using next() instead of nextLine() for reading the name.

Printing a variable that was not declared.

Use nextLine() to read the full name, nextInt() to read the age, and print the name and age together.