數(shù)組模擬隊(duì)列

出隊(duì)列操作getQueue

顯示隊(duì)列的情況showQueue

查看隊(duì)列頭元素headQueue

退出系統(tǒng)exit

?

ArrayQueueDemo.java

package com.dym.queue;import java.util.Scanner;public class ArrayQueueDemo {public static void main(String[] args) {//測試一把//創(chuàng)建一個(gè)隊(duì)列ArrayQueue queue = new ArrayQueue(3);char key = ' '; //接收用戶輸入Scanner scanner = new Scanner(System.in);//boolean loop = true;//輸出一個(gè)菜單while(loop) {System.out.println("s(show): 顯示隊(duì)列");System.out.println("e(exit): 退出程序");System.out.println("a(add): 添加數(shù)據(jù)到隊(duì)列");System.out.println("g(get): 從隊(duì)列取出數(shù)據(jù)");System.out.println("h(head): 查看隊(duì)列頭的數(shù)據(jù)");key = scanner.next().charAt(0);//接收一個(gè)字符switch (key) {case 's':queue.showQueue();break;case 'a':System.out.println("輸出一個(gè)數(shù)");int value = scanner.nextInt();queue.addQueue(value);break;case 'g': //取出數(shù)據(jù)try {int res = queue.getQueue();System.out.printf("取出的數(shù)據(jù)是%d\n", res);} catch (Exception e) {// TODO: handle exceptionSystem.out.println(e.getMessage());}break;case 'h': //查看隊(duì)列頭的數(shù)據(jù)try {int res = queue.headQueue();System.out.printf("隊(duì)列頭的數(shù)據(jù)是%d\n", res);} catch (Exception e) {// TODO: handle exceptionSystem.out.println(e.getMessage());}break;case 'e': //退出scanner.close();loop = false;break;default:break;}}System.out.println("程序退出~~");}}// 使用數(shù)組模擬隊(duì)列-編寫一個(gè)ArrayQueue類 class ArrayQueue {private int maxSize; // 表示數(shù)組的最大容量private int[] arr; // 該數(shù)據(jù)用于存放數(shù)據(jù), 模擬隊(duì)列private int front; // 隊(duì)列頭private int rear; // 隊(duì)列尾// 創(chuàng)建隊(duì)列的構(gòu)造器public ArrayQueue(int arrMaxSize) {maxSize = arrMaxSize;arr = new int[maxSize];front = -1; // 指向隊(duì)列頭部，分析出front是指向隊(duì)列頭的前一個(gè)位置.rear = -1; // 指向隊(duì)列尾，指向隊(duì)列尾的數(shù)據(jù)(即就是隊(duì)列最后一個(gè)數(shù)據(jù))}// 判斷隊(duì)列是否滿public boolean isFull() {return rear == maxSize - 1;}// 判斷隊(duì)列是否為空public boolean isEmpty() {return rear == front;}// 添加數(shù)據(jù)到隊(duì)列public void addQueue(int n) {// 判斷隊(duì)列是否滿if (isFull()) {System.out.println("隊(duì)列滿，不能加入數(shù)據(jù)~");return;}rear++; // 讓rear 后移arr[rear] = n;}// 獲取隊(duì)列的數(shù)據(jù), 出隊(duì)列public int getQueue() {// 判斷隊(duì)列是否空if (isEmpty()) {// 通過拋出異常throw new RuntimeException("隊(duì)列空，不能取數(shù)據(jù)");}front++; // front后移return arr[front];}// 顯示隊(duì)列的所有數(shù)據(jù)public void showQueue() {// 遍歷if (isEmpty()) {System.out.println("隊(duì)列空的，沒有數(shù)據(jù)~~");return;}for (int i = 0; i < arr.length; i++) {System.out.printf("arr[%d]=%d\n", i, arr[i]);}}// 顯示隊(duì)列的頭數(shù)據(jù)， 注意不是取出數(shù)據(jù)public int headQueue() {// 判斷if (isEmpty()) {throw new RuntimeException("隊(duì)列空的，沒有數(shù)據(jù)~~");}return arr[front + 1];} }

D:\soft\Java\jdk1.8.0_261\bin\java.exe "-javaagent:D:\soft\IntelliJ IDEA 2019.3.5\lib\idea_rt.jar=51051:D:\soft\IntelliJ IDEA 2019.3.5\bin" -Dfile.encoding=UTF-8 -classpath D:\soft\Java\jdk1.8.0_261\jre\lib\charsets.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\deploy.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\access-bridge-64.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\cldrdata.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\dnsns.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\jaccess.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\jfxrt.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\localedata.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\nashorn.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\sunec.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\sunjce_provider.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\sunmscapi.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\sunpkcs11.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\ext\zipfs.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\javaws.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\jce.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\jfr.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\jfxswt.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\jsse.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\management-agent.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\plugin.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\resources.jar;D:\soft\Java\jdk1.8.0_261\jre\lib\rt.jar;D:\IDEAWorkSpace\dym_DataStructures\out\production\dym_DataStructures com.dym.queue.ArrayQueueDemo
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
s
隊(duì)列空的，沒有數(shù)據(jù)~~
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
a
輸出一個(gè)數(shù)
1
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
a
輸出一個(gè)數(shù)
2
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
a
輸出一個(gè)數(shù)
3
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
s
arr[0]=1
arr[1]=2
arr[2]=3
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
h
隊(duì)列頭的數(shù)據(jù)是1
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)
g
取出的數(shù)據(jù)是1
s(show): 顯示隊(duì)列
e(exit): 退出程序
a(add): 添加數(shù)據(jù)到隊(duì)列
g(get): 從隊(duì)列取出數(shù)據(jù)
h(head): 查看隊(duì)列頭的數(shù)據(jù)

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