数据结构学习一队列：简单队列01

package queue;

import java.util.ArrayList;
import java.util.List;

public class MyQueue {
    //store elements
	private List<Integer> data;
	// a pointer to indicate the start position
	private int p;
	
	MyQueue(){
		data = new ArrayList<Integer>();
		p = 0;
	}
	
	/** insert an element into the queue,return true if the operation is successful*/
	public boolean enqueue(int x) {
		data.add(x);
		return true;
	}
	
	/** delete an element into the queue, return true if the operation is successful*/
	public boolean dequeue() {
		if(isEmpty()) {
			return false;
		}
		p++;
		return true;
	}
	
	/** Check whether the queue is empty or not*/
	public boolean isEmpty() {
		return p>=data.size();
	}
	
	/** get the front item from the queue.*/
	public int front() {
		return data.get(p);
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		MyQueue queue = new MyQueue();
		queue.enqueue(1);
		queue.enqueue(2);
		
		if(queue.isEmpty()==false)
			System.out.println(queue.front());
		queue.dequeue();
		if(queue.isEmpty()==false)
			System.out.println(queue.front());
		queue.dequeue();
		if(queue.isEmpty()==false)
			System.out.println(queue.front());
		queue.dequeue();
	}
	

}

数据结构思想：

• 先进先出，从队列头部出队，尾部入队

Java实现步骤

• 构造一个队列，以集合代替
• 设定一个指示在集合中位置的变量，相当于指针
• 对于队列的添加要判断队列是否满了
• 删除需要判断是否为空