import java.util.Scanner;
public class ArrayQueueDemo{
public static void main(String[] args){
//創建一個隊列
ArrayQueue queue=new ArrayQueue(3);
char key='';//接收用戶輸入;
Scanner scanner=new Scanner(System.in);
boolean loop=true;
while(loop){
System.out.println("s(show):顯示隊列");
System.out.println("e(exit):退出程序");
System.out.println("a(add):添加數據隊列");
System.out.println("g(get):從隊列取出數據");
System.out.println("h(head):查看隊列頭的數據");
key=scanner.next().charAt(0);//接收一個字符
switch(key){
case 's':
queue.showQueue();
break;
case 'a':
System.out.println("輸出一個數");
int value=scanner.nextInt();
queue.addQueue(value);
break;
case 'g'://取出數據
try{
int res=queue.getQueue();
System.out.printf("取出的數據是%d\n",res);
}catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage(););
}
break;
case 'h':
try{
int res=queue.headQueue();
System.out.printf("隊列的頭數據是%d\n",res);
}catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage(););
}
break;
case 'e'://退出
scanner.close();
loop=false;
break;
default:
break;
}
}
System.out.println("程序退出");
}
}
public class ArrayQueue {
private int maxSize;
private int front;
private int rear;
private int[] arr;
public ArrayQueue(int arrMaxSize){
maxSize=arrMaxSize;
arr=new int[maxSize];
front=-1;
rear=-1;
}
//判斷隊列是否滿
public boolean isFull(){
return rear=maxSize-1;
}
//判斷隊列是否爲空
public boolean isEmpty(){
return rear=front;
}
//添加數據到隊列
public void addQueue(int n){
//判斷隊列是否滿
if(isFull()){
System.out.print();
return;
}
//rear++;
arr[++rear]=n;
}
//獲取數列的數據,出隊列
public int getQueue(){
//判斷隊列是否爲空
if(isEmpty()){
//通過拋出異常
throw newRuntimeException("隊列爲空,不能取數據");
}
front++;
return arr[front];
}
//顯示隊列所有的數據
public void showQueue(){
//遍歷
if(isEmpty()){
System.out.println("隊列爲空,沒有數據~~~");
return;
}
for(int i=0;i<arr.length;i++){
System.out.println("arr[%d]=%d\n",i,arr[i]);
}
}
//顯示隊列頭數據
public int headQueue(){
//判斷
if(isEmpty()){
//System.out.println("隊列空的,沒有數據");
throw new RuntimeException("隊列爲空,沒有數據");
}
return arr[front+1];
}
}