Course Content
Java Basics
Java Basics
For-Each Loop
You might wonder why we cover this loop in the section about arrays. That's because this loop is specifically designed for use with arrays or collections. You'll delve deeper into collections in a separate course.
What is a for-each loop?
The for-each loop, also referred to as the enhanced for loop, offers a concise and simplified method for iterating over elements of an array or any iterable collection in Java. It removes the necessity for explicit indexing and streamlines the code.
The syntax for this loop is as follows:
Main.java
Explanation of each element:
ElementType: The data type of elements in the array;variable: A variable representing each array element in each iteration;iterable: The array or iterable collection you want to iterate over.
The for-each loop automatically iterates over each element of the array or iterable collection, assigning it to the variable in each iteration until all elements have been processed.
Let's take a look at an example of using a for-each loop:
Main.java
Note
We are not using an index here. To perform operations on an array element, we refer to it as "element" rather than "array[element]".
We can also perform operations on each element of an array using a for-each loop.
Let's consider an example task:
You need to multiply each element of a double array by 3 and display the result on the screen using a for-each loop.
Main.java
As you can see, we are multiplying each element by 3 without using indexing, using the statement element = element * 3;.
Task
We have a one-dimensional array of type int where all the values are either 5 or 7. However, I don't like the number 7; it's just not aesthetically pleasing.
Using a for-each loop, replace every occurrence of the number 7 in this array with the number 5 so that it becomes an array of 5s. Don't forget to print the resulting array.
Everything was clear?
Course Content
Java Basics
Java Basics
For-Each Loop
You might wonder why we cover this loop in the section about arrays. That's because this loop is specifically designed for use with arrays or collections. You'll delve deeper into collections in a separate course.
What is a for-each loop?
The for-each loop, also referred to as the enhanced for loop, offers a concise and simplified method for iterating over elements of an array or any iterable collection in Java. It removes the necessity for explicit indexing and streamlines the code.
The syntax for this loop is as follows:
Main.java
Explanation of each element:
ElementType: The data type of elements in the array;variable: A variable representing each array element in each iteration;iterable: The array or iterable collection you want to iterate over.
The for-each loop automatically iterates over each element of the array or iterable collection, assigning it to the variable in each iteration until all elements have been processed.
Let's take a look at an example of using a for-each loop:
Main.java
Note
We are not using an index here. To perform operations on an array element, we refer to it as "element" rather than "array[element]".
We can also perform operations on each element of an array using a for-each loop.
Let's consider an example task:
You need to multiply each element of a double array by 3 and display the result on the screen using a for-each loop.
Main.java
As you can see, we are multiplying each element by 3 without using indexing, using the statement element = element * 3;.
Task
We have a one-dimensional array of type int where all the values are either 5 or 7. However, I don't like the number 7; it's just not aesthetically pleasing.
Using a for-each loop, replace every occurrence of the number 7 in this array with the number 5 so that it becomes an array of 5s. Don't forget to print the resulting array.
Everything was clear?
