Java Iterator vs. Iterable: Revealing the Secrets of Iterative Operations

php editor Strawberry will take you to explore the mysteries of the two key interfaces Iterator and Iterable in Java. In Java programming, iteration operations are one of the common and important operations. Understanding the usage and differences of Iterator and Iterable is crucial to improving the clarity and efficiency of the code. Let us uncover the secrets behind iterative operations and add new skills and insights to your Java programming journey!

// 使用 Iterator 迭代 ArrayList
List<String> names = new ArrayList<>();
names.add("John");
names.add("Mary");
names.add("Bob");

Iterator<String> iterator = names.iterator();
while (iterator.hasNext()) {
String name = iterator.next();
System.out.println(name);
}

Java Iterable is another interface that represents iterable objects. Iterable objects can be iterated through the for-each statement. In the for-each statement, the compiler automatically generates an Iterator object and uses the hasNext() and next() methods to iterate over the elements in the Iterable object.

// 使用 for-each 语句迭代 ArrayList
List<String> names = new ArrayList<>();
names.add("John");
names.add("Mary");
names.add("Bob");

for (String name : names) {
System.out.println(name);
}

The Iterable interface and the Iterator interface are closely related. The Iterable interface represents iterable objects, while the Iterator interface provides methods for traversing these objects. Developers can obtain the Iterator object through the iterator() method of the Iterable object, and then use the Iterator object to traverse the elements in the collection.

In Java, many classes in the collection framework implement the Iterable interface, including List, Set and Map. This means that these collections can be iterated using a for-each statement or an Iterator.

Iterator and Iterable interfaces are very useful. They provide developers with a common way to traverse collection elements. No matter what kind of collection a developer is working with, he or she can easily iterate over the elements in the collection using the Iterator or Iterable interfaces.

The above is the detailed content of Java Iterator vs. Iterable: Revealing the Secrets of Iterative Operations. For more information, please follow other related articles on the PHP Chinese website!