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分类: Java

2021-07-12 17:21:41

import java.awt.Font;

import java.util.Scanner;

import javax.management.RuntimeErrorException;

public class CircleArrayQueueDemo {

public static void main(String[] args) {

//创建队列

CircleArrayQueue circleArrayQueue = new CircleArrayQueue(4);

char key = ' ';

Scanner scanner = new Scanner(System.in);

boolean loop = true;

while(loop) {

System.out.println("s(show):显示队列");

System.out.println("e(exit):退出程序");

System.out.println("a(add):添加数据到队列");

System.out.println("g(get):从队列取出数据");

System.out.println("h(head):查看队列头的数据");

key = scanner.next().charAt(0);

switch (key) {

case 's':

circleArrayQueue.showQueue();

break;

case 'e':

circleArrayQueue.showQueue();

break;

case 'a':

System.out.println("输入一个数");

int value = scanner.nextInt();

circleArrayQueue.addQueue(value);

break;

case 'g':

try {

int res = circleArrayQueue.getQueue();

System.out.printf("取出的数据是%d\n",res);

}catch (Exception e) {

System.out.println(e.getMessage());

}

break;

case 'h':

try {

int res = circleArrayQueue.headQueue();

System.out.printf("队列头的数据是%d\n",res);

}catch (Exception e) {

System.out.println(e.getMessage());

}

break;

default:

scanner.close();

loop = false;

break;

}

}

System.out.println("程序退出");

}

}

//队列

class CircleArrayQueue{

private int maxsize;

private int front;

private int rear;

private int[] arr;

//构造器

public CircleArrayQueue(int arrmaxsize) {

maxsize = arrmaxsize;

front = 0;

rear = 0;

arr = new int[maxsize];

}

//判满

public boolean isFull() {

return (rear+1)%maxsize == front;

}

//判空

public boolean isEmpty() {

return rear == front;

}

//入队

public void addQueue(int n) {

if(isFull()) {

System.out.println("队列已满,不能再添加!");

return;

}

//添加数据

arr[rear] = n;

//rear后移

rear = (rear + 1) % maxsize;

}

//出队

public int getQueue() {

if(isEmpty()) {

throw new RuntimeException("队列为空,不可取出元素!");

}

//取值

int value = arr[front];

//front后移

front = (front + 1)%maxsize;

return value;

}

//遍历

public void showQueue() {

if(isEmpty()) {

System.out.println("队列为空!");

return;

}

for(int i = front; i < front +  size(); i++) {

System.out.printf("arr[%d]=%d\n",i % maxsize, arr[i % maxsize]);

}

}

//求队列有效数据的个数

public int size() {

return (rear + maxsize - front) % maxsize;

}

//显示队头元素

public int headQueue() {

if(isEmpty()) {

throw new RuntimeException("队列为空,不可取出元素!");

}

return arr[front];

}

}

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