How to use iterable in java

The Iterable interface represents a traversable collection of objects and provides methods for accessing elements one by one. Steps: Create an Iterable object. Get the Iterator object. Iterate over the collection (using hasNext and next methods). Advantages: Decoupled traversal logic. Improve code readability. Provide reusability.

Using the Iterable interface in Java

Introduction to the Iterable interface

## The #Iterable interface represents an iterable collection of objects and provides methods for traversing the elements in the collection. Simply put, Iterable allows you to access each element in the collection in turn.

Usage

To use the Iterable interface, you need to follow these steps:

1. Create an Iterable object: This This can be achieved by creating a class that implements the Iterable interface or by using built-in collection classes such as List, Set, and Map.
2. Get an Iterator object: Use the iterator() method to get an Iterator object from an Iterable object.
3. Traverse the collection: Use the hasNext() method to check if there are more elements, and use the next() method to get the next element.

Example:

<code class="java">// 创建一个实现了 Iterable 接口的类
class MyIterable implements Iterable<Integer> {
    private int[] arr;

    public MyIterable(int[] arr) {
        this.arr = arr;
    }

    @Override
    public Iterator<Integer> iterator() {
        return new MyIterator(arr);
    }

    // 自主定义 Iterator 类
    private class MyIterator implements Iterator<Integer> {
        private int index = 0;

        @Override
        public boolean hasNext() {
            return index < arr.length;
        }

        @Override
        public Integer next() {
            return arr[index++];
        }
    }
}

public class Main {
    public static void main(String[] args) {
        int[] myArray = {1, 2, 3, 4, 5};
        MyIterable iterable = new MyIterable(myArray);

        // 使用 for-each 循环遍历集合
        for (int num : iterable) {
            System.out.println(num);
        }
    }
}</code>

Advantages

There are several advantages to using the Iterable interface:

• Decoupled traversal logic: The Iterable interface separates the iteration details of the collection from the specific implementation.
• Code readability: The for-each statement can improve the readability of the code for traversing the collection.
• Reusability: Iterable objects can be reused in different contexts without having to reimplement the traversal logic.

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