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  2. AP Computer Science A
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Enhanced For Loop For Arrays

Caleb Thomas

Caleb Thomas

4 min read

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Study Guide Overview

This guide covers the enhanced for loop in Java, used for traversing data structures. It explains the loop's structure, its limitations (including its inability to modify array elements due to Java's pass-by-value nature), and how to use it with mutator methods on objects. It also compares enhanced for loops with regular for loops, highlighting the enhanced loop's restriction to full traversal.

Now, we will introduce a special kind of for loop called the enhanced for loop. The enhanced for loop can be used to traverse through most data structures. Note that the enhanced for loop can only be used to traverse in the forward direction. To use it, we use this structure:

#Structure for Enhanced 'For Loops'

for (dataType i: arrayName) {
do something with i
}

This basically says that for every element i in the array, we do something to i.

#Limitations of Enhanced 'For Loops'

We can only access i, but we cannot change or set new values to i. Thus, we cannot do this:

/** Doubles each element of the array
*/
public static void doubleArray(int[] arra...
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Question 1 of 6

🥳 What is the correct syntax for an enhanced for loop to iterate through an array named values of type double?

for (double x : values) {}

for (int i = 0; i < values.length; i++) {}

for (values : double x) {}

for (double values : x) {}