Java uses the iterator() function of the Set class to traverse the elements in the set

Java uses the iterator() function of the Set class to traverse the elements in the set

Set in Java is an unordered, non-repeatable collection. When traversing the Set collection, we can use the iterator() function to obtain an iterator, and then traverse the elements in the collection through the iterator.

First, we need to create a Set object and add some elements to it. For example, we create a HashSet object named set and add some integer elements to it.

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class SetIteratorExample {
    public static void main(String[] args) {
        // 创建Set对象
        Set<Integer> set = new HashSet<>();
        
        // 向Set中添加元素
        set.add(1);
        set.add(2);
        set.add(3);
        set.add(4);
        set.add(5);
        
        // 使用iterator()函数获取迭代器
        Iterator<Integer> iterator = set.iterator();
        
        // 遍历集合中的元素
        while (iterator.hasNext()) {
            Integer element = iterator.next();
            System.out.println(element);
        }
    }
}

In the above code example, we first create a HashSet object and add some integer elements to it. Then, we use the iterator() function to obtain an iterator, and then traverse the elements in the collection through the iterator. In the while loop, we use the hasNext() function to determine whether there is a next element. If there is, use the next() function to get the next element and output it to the console.

Run the above code, the output result will be:

1
2
3
4
5

Through the above code example, we can see that it is very convenient to use the iterator() function of the Set class to traverse the elements in the set. This traversal method applies to any collection class that implements the Iterator interface, not just the Set class.

It should be noted that when traversing the collection, we need to use the hasNext() function to determine whether there is a next element, and then use the next() function to obtain the next element. When the last element is traversed, the hasNext() function will return false and the loop will exit.

Summary:

This article introduces Java to use the iterator() function of the Set class to traverse the elements in the set. We used a code example to demonstrate how to use the iterator() function to obtain an iterator and traverse the elements in the collection through the iterator. I hope this article will help you understand how Set collections are traversed.

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