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  • 自定义线性结构-队列

    /**
     * @desc: 队列--单链表实现
     * @author: 毛会懂
     * @create: 2020-12-30 10:55:00
     **/
    public class MyQueue<T> implements Iterable<T>{
        private Node head;
        private Node last; //尾节点
        private Integer count;
    
        MyQueue(){
            head = new Node(null,null);
            last = null;
            count = 0;
        }
    
        //进队列
        public void enter(T t){
            Node newNode = new Node(t,null);
            if(isEmpty()){
                head.next = newNode;
            }else {
                last.next = newNode;
            }
            last = newNode;
            count++;
        }
    
        //出队列
        public T del(){
            if(isEmpty()){
                return null;
            }
            Node node = head.next;
            head.next = node.next;
            count--;
            //只有一个元素出队列
            if(isEmpty()){
                last = null;
            }
            return node.t;
        }
    
    
        //队列是否为空
        public Boolean isEmpty(){
            return count == 0;
        }
    
        //队列的大小
        public Integer size(){
            return count;
        }
    
        @Override
        public Iterator<T> iterator() {
            return new MyIterator();
        }
    
        private class MyIterator implements Iterator{
            private Node node;
    
            public MyIterator(){
                node = head;
            }
    
            @Override
            public boolean hasNext() {
                return node.next != null;
            }
    
            @Override
            public T next() {
                node = node.next;
    
                return node.t;
            }
        }
    
    
        private class Node{
            private T t;
            private Node next;
    
            public Node(T t, Node next) {
                this.t = t;
                this.next = next;
            }
        }
    }

    测试:

    public static void main(String[] args) {
    MyQueue<String> myQueue = new MyQueue<>();
    myQueue.enter("abc");
    myQueue.enter("bddd");
    for (String s : myQueue) {
    System.out.println(s);
    }
    System.out.println("--------");
    System.out.println("是否为空:" + myQueue.isEmpty());
    System.out.println("队列大小:" + myQueue.size());
    System.out.println(myQueue.del());
    System.out.println(myQueue.del());
    System.out.println("------");
    myQueue.enter("sss");
    myQueue.enter("bb");
    myQueue.enter("cc");
    myQueue.forEach(System.out::println);
    System.out.println(myQueue.del());
    }
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  • 原文地址:https://www.cnblogs.com/maohuidong/p/14216144.html
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