package array_queue;
public class ArrayQueue {
private int front;
private int rear;
private int maxSize;
private int []arr;
public ArrayQueue(int arrMaxSize){
maxSize = arrMaxSize;
arr = new int[maxSize];
front = -1;
rear = -1;
}
public boolean isFull(){
return rear == maxSize-1;
}
public boolean isEmpty(){
return rear == front;
}
public void addElem(int data){
if(isFull()){
throw new RuntimeException("队列满,不能入队");
}
arr[++rear] = data;
}
public int getElem(){
if(isEmpty()){
throw new RuntimeException("队列空,不能出队");
}
return arr[++front];
}
public void showQueue(){
if(isEmpty()){
throw new RuntimeException("队列空,无法获取任何元素");
}
for (int i=0;i<maxSize;i++) {
System.out.printf("arr[%d] = %d\n", i, arr[i]);
}
}
public int getHeadElem(){
if(isEmpty()){
throw new RuntimeException("队列空,无法获取任何元素");
}
return arr[front+1];
}
}
测试:
package array_queue;
import java.util.Scanner;
public class ArrayQueueTest {
public static void testArrayQueue(){
ArrayQueue queue = new ArrayQueue(3);
char key = ' ';
Scanner scanner = new Scanner(System.in);
boolean loop = true;
while(loop){
System.out.println("========================");
System.out.println("请选择您要使用的功能:");
System.out.println("s(show):显示队列");
System.out.println("a(add):数据入队");
System.out.println("g(get):数据出队");
System.out.println("h(head):获取队列头数据");
System.out.println("e(exit):退出程序");
System.out.println("请输入您的需求:");
key = scanner.next().charAt(0);
switch (key){
case 's':
try {
System.out.println("队列为:");
queue.showQueue();
}catch (Exception e){
System.out.println(e.getMessage());
}
break;
case 'a':
try {
System.out.println("请输入你要添加的数据:");
int data = scanner.nextInt();
queue.addElem(data);
}catch (Exception e){
System.out.println(e.getMessage());
}
break;
case 'g':
try{
int data2 = queue.getElem();
System.out.printf("取出的数据是:%d\n",data2);
}catch (Exception e){
System.out.println(e.getMessage());
}
break;
case 'h':
try{
int head = queue.getHeadElem();
System.out.println("取出的队头数据为:"+head);
}catch (Exception e){
System.out.println(e.getMessage());
}
break;
case 'e':
scanner.close();
loop = false;
break;
default:
break;
}
}
System.out.println("程序退出!");
}
public static void main(String[] args) {
testArrayQueue();
}
}