Array traversal in Java - Interactive Code Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each element of the array.

Java

int[] numbers = {1, 2, 3, 4, 5};
for (int [1] = 0; i < numbers.length; i++) {
    System.out.println(numbers[i]);
}

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Aj

Bi

Ck

Dn

Attempts:

3 left

2fill in blank

medium

Complete the code to sum all elements in the array.

Java

int[] values = {10, 20, 30};
int sum = 0;
for (int i = 0; i < [1]; i++) {
    sum += values[i];
}
System.out.println(sum);

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Avalues.length

Bvalues.length()

Cvalues.size

Dvalues.size()

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to print all elements of the array.

Java

String[] fruits = {"apple", "banana", "cherry"};
for (int i = 0; i <= [1]; i++) {
    System.out.println(fruits[i]);
}

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Afruits.length - 1

Bfruits.size

Cfruits.length

Dfruits.size()

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create a map of words to their lengths for words longer than 3 characters.

Java

Map<String, Integer> wordLengths = new HashMap<>();
String[] words = {"cat", "elephant", "dog", "lion"};
for (String [1] : words) {
    if ([2].length() > 3) {
        wordLengths.put([2], [2].length());
    }
}

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Aword

Bw

Citem

Delement

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to create a map of uppercase words to their lengths for words longer than 4 characters.

Java

Map<String, Integer> result = new HashMap<>();
String[] words = {"tree", "mountain", "river", "sky"};
for (String [1] : words) {
    if ([2].length() > 4) {
        result.put([3], [2].length());
    }
}

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Aw

Cw.toUpperCase()

Dword

Attempts:

3 left