分享一个基于java ArrayList的简单MQ队列，用在连接多个蓝牙设备一个一个连接的应用中

import java.util.ArrayList;
 
public class TestMQ {
    private static ArrayList<String> conncetMq = new ArrayList<String>();
     
    public static void main(String[] args) {
        System.out.println(getMq());
        addMq("aaa");
        addMq("bbb");
        addMq("ccc");
        addMq("aaa");
        addMq("bbb");
        System.out.println(getMq());
        System.out.println("the arrayList: " + conncetMq);
        requeueMq("aaa");
        System.out.println("the arrayList: " + conncetMq);
        //index最大的一个是最后添加的
        removeMq("bbb");
        System.out.println("the arrayList: " + conncetMq);
         
        removeMq("bbb");
        System.out.println("the arrayList: " + conncetMq);
    }
  
    //获取第一个队列元素
    public static String getMq(){
        if(conncetMq.size() > 0){
            return conncetMq.get(0);
        }
        return "";
    }
     
    //清除元素
    public static void clearMq(){
        conncetMq.clear();
    }
     
    //重新排队
    public static void requeueMq(String address){
        for(String addr : conncetMq){
            if(addr.equalsIgnoreCase(address)){
                conncetMq.remove(address);
                conncetMq.add(address);
                break;
            }
        }
    }
     
    //删除队列元素
    public static void removeMq(String address){
        for(String addr : conncetMq){
            if(addr.equalsIgnoreCase(address)){
                conncetMq.remove(address);
                break;
            }
        }
    }
     
    //添加队列元素 不能重复
    public static void addMq(String address){
        boolean inMq = false;
        for(String addr : conncetMq){
            if(addr.equalsIgnoreCase(address)){
                inMq = true;
                break;
            }
        }
        if(!inMq){
            conncetMq.add(address);
        }
    }
     
     
}