Enhanced for loop in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each number in the array using an enhanced for loop.

Java

int[] numbers = {1, 2, 3, 4, 5};
for ([1] num : numbers) {
    System.out.println(num);
}

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

Aint

Bboolean

Cdouble

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong type like String or boolean causes a compile error.

The enhanced for loop requires the type of the elements in the array. Since numbers is an int array, the type is int.

2fill in blank

medium

Complete the code to sum all elements in the array using an enhanced for loop.

Java

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

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Ai

Bnum

Cval

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inside and outside the loop body causes errors.

The variable name inside the loop can be any valid identifier. Here, val is used consistently.

3fill in blank

hard

Fix the error in the enhanced for loop to print each string in the array.

Java

String[] fruits = {"apple", "banana", "cherry"};
for ([1] fruit : fruits) {
    System.out.println(fruit);
}

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Aboolean

Bint

Cchar

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong type like int or char causes a compile error.

The array contains strings, so the loop variable must be of type String.

4fill in blank

hard

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

Java

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

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AString

B>

C<

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong types or wrong comparison operators.

The loop variable must be String because the array contains strings. The condition checks if the word length is greater than 3.

5fill in blank

hard

Fill all three blanks to create a map of uppercase words and their lengths for words shorter than 5 characters.

Java

String[] words = {"tree", "house", "car", "boat"};
Map<String, Integer> map = new HashMap<>();
for ([1] word : words) {
    if (word.length() [2] 5) {
        map.put(word.[3](), word.length());
    }
}

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AString

B<

CtoUpperCase

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong operators or method names causes errors.

The loop variable is String. The condition checks for words shorter than 5 characters using <. The method toUpperCase() converts the word to uppercase before putting it in the map.