Why input and output are required in Java - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a message to the console.

Java

System.out.[1]("Hello, world!");

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

Aoutput

Bprint

Cprintln

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'print' which does not add a new line.

Trying to use methods that don't exist like 'write' or 'output'.

The println method prints the message and moves to a new line.

2fill in blank

medium

Complete the code to read a line of input from the user.

Java

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

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

AnextLine

BinputLine

CreadLine

DnextInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'nextInt' which reads only integers.

Trying to use 'readLine' which is not a Scanner method.

The nextLine() method reads a full line of text from the user.

3fill in blank

hard

Fix the error in the code to correctly read an integer input.

Java

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

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

AreadInt

BinputInt

CnextLine

DnextInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'nextLine' which reads a string, not an integer.

Using non-existent methods like 'readInt' or 'inputInt'.

The nextInt() method reads an integer value from the user.

4fill in blank

hard

Fill both blanks to create a program that reads a name and prints a greeting.

Java

Scanner scanner = new Scanner(System.in);
String name = scanner.[1]();
System.out.[2]("Hello, " + name + "!");

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

AnextLine

Bprintln

CnextInt

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextInt() to read a name.

Using print() instead of println().

Use nextLine() to read the name and println() to print the greeting with a new line.

5fill in blank

hard

Fill all three blanks to read two numbers and print their sum.

Java

Scanner scanner = new Scanner(System.in);
int num1 = scanner.[1]();
int num2 = scanner.[2]();
System.out.[3]("Sum: " + (num1 + num2));

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

AnextLine

BnextInt

Cprintln

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() to read integers.

Using print() instead of println().

Use nextInt() twice to read integers and println() to print the sum with a new line.