For each loop in java 8 javatpoint

For each loop in java 8 javatpoint

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Looping is a fundamental concept in programming, and Java 8 has introduced some exciting new features that can make our code more readable, efficient, and effective. Let's dive into the world of loops in Java 8, as explained by Javatpoint.

1. For-Each Loop

In Java 7 and earlier versions, when you wanted to iterate over a collection or array, you had to use an index variable. This could lead to tedious code and errors if not handled properly. Java 8 introduced the foreach loop, also known as the enhanced for loop.

Here's an example:

List fruits = Arrays.asList("Apple", "Banana", "Cherry");
for (String fruit : fruits) {
System.out.println(fruit);
}

In this code, we're iterating over a list of strings. The syntax is straightforward: for (Type variableName : iterable).

2. Repeat Loop

The repeat loop is another new feature in Java 8. It allows you to execute a block of code repeatedly for a specified number of iterations.

Here's an example:

IntStream.range(1, 5).forEach(i -> System.out.println("Iteration " + i));

In this code, we're using the range method to create a stream of numbers from 1 to 4 (exclusive). Then, we use the forEach method to execute a lambda expression for each number in the stream.

3. Lambda Loop

The lambda loop, also known as the method reference loop, is another way to iterate over a collection using lambdas. This feature was introduced in Java 8 and provides a concise way to perform operations on collections.

Here's an example:

List names = Arrays.asList("John", "Alice", "Bob");
names.forEach(n -> System.out.println("Hello, " + n));

In this code, we're using the forEach method to iterate over a list of strings. We pass a lambda expression that takes each string in the list and prints a greeting message.

4. Stream Loop

The stream loop is a more functional way to perform operations on collections. It's a powerful feature that allows you to process data in a declarative style, without explicitly looping over the collection.

Here's an example:

List words = Arrays.asList("Hello", "World", "Java");
words.stream()
.map(word -> word.toLowerCase())
.forEach(System.out::println);

In this code, we're using the stream method to create a stream from a list of strings. Then, we use the map method to transform each string to lowercase and finally print the results using the forEach method.

These are just some examples of how Java 8 has made looping more efficient, readable, and powerful. Whether you're working with arrays, lists, or streams, there's a looping mechanism that suits your needs.

Stay tuned for more Java 8 goodness!

What is the purpose of the forEach() method in Java 8?

The forEach() method in Java 8 is a part of the Stream API, which was introduced to simplify working with collections and streams of data. Its primary purpose is to perform an action on each element of a stream or collection.

The forEach() method takes a Consumer (an interface that represents an operation that accepts a single input argument and returns no result) as its parameter. When called on a Stream, it applies the provided Consumer to each element in the stream, one by one.

Here are some key points about the purpose of forEach():

Some common use cases for the forEach() method include:

In summary, the forEach() method in Java 8 is a powerful tool for performing actions on each element of a stream or collection. Its ability to iterate over elements and handle side-effects makes it an essential part of any Java programmer's toolkit.