用java实现循环队列？

class Element{
int id;
String name;
Element(int a,String n){
id=a;name=n;
}
}

class SeqQueue{
int first,last,maxsize;
Element queue[];
SeqQueue(int i){
maxsize=i;
first=last=-1;
queue=new Element[i];
}

public void clear(){//置空
first=last=-1;
}

public boolean isEmpty(){//判空
if(first==-1)return true;
else return false;
}

public Element getFirst(){//取队列头元素
if(first==-1)return null;
else return queue[first+1];
}

public boolean isFull(){//判满
if((last+1)%maxsize==first)return true;
else return false;
}

public boolean enQueue(Element e){//入队
if(this.isFull())return false;
if(this.isEmpty())
first=