Reading string input in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a line of text from the user using Scanner.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.[1]();
        System.out.println("You entered: " + input);
        scanner.close();
    }
}

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

AnextBoolean

BnextInt

CnextDouble

DnextLine

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextInt() instead of nextLine() causes input mismatch errors when reading text.

Forgetting to close the Scanner object.

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

2fill in blank

medium

Complete the code to read a single word from the user input.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String word = scanner.[1]();
        System.out.println("Word: " + word);
        scanner.close();
    }
}

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

Anext

BnextInt

CnextLine

DnextBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() when only a single word is needed.

Using nextInt() which expects a number.

The next() method reads the next token (word) from the input.

3fill in blank

hard

Fix the error in the code to correctly read a string input.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String text = scanner.[1];
        System.out.println(text);
        scanner.close();
    }
}

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

AnextLine()

BnextLine

Cnext()

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting parentheses after method names.

Using nextLine without parentheses causes a compile error.

The method call must include parentheses () to invoke it. So nextLine() is correct.

4fill in blank

hard

Fill both blanks to read a word and then a full line from the user.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String firstWord = scanner.[1]();
        scanner.[2](); // consume leftover newline
        String fullLine = scanner.nextLine();
        System.out.println("First word: " + firstWord);
        System.out.println("Full line: " + fullLine);
        scanner.close();
    }
}

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

Anext

BnextLine

CnextInt

DnextBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Not consuming the leftover newline causes the nextLine() to read an empty string.

Using nextLine() for the first word instead of next().

Use next() to read the first word, then nextLine() to consume the leftover newline before reading the full line.

5fill in blank

hard

Fill all three blanks to read two words and then print them in uppercase.

Java

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String word1 = scanner.[1]();
        String word2 = scanner.[2]();
        System.out.println(word1.[3]());
        System.out.println(word2.toUpperCase());
        scanner.close();
    }
}

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

Anext

BnextLine

CtoUpperCase

DnextInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using nextLine() to read words when next() is better for single words.

Forgetting parentheses after toUpperCase.

Use next() to read each word, then toUpperCase() to convert the first word to uppercase before printing.