队列的tostring方法,该如何解决

package sun.way;class QueueT {    private int maxSize;    private int[] queArr;    private int front;    private int rear;    private int nItems;        public QueueT(int s) {        maxSize = s;        queArr = new int[maxSize];        front = 0;        rear = -1;        nItems = 0;    }        public void insert(int j) {        if (isFull())            return;        if (rear == maxSize - 1)            rear = -1;        queArr[++rear] = j;        nItems++;    }        public int remove() {        int temp = queArr[front++];        if (front == maxSize)            front = 0;        nItems--;        return temp;    }        public int peekFront(){        return queArr[front];    }        public boolean isEmpty() {        return (nItems == 0);    }        public boolean isFull() {        return (nItems == maxSize);    }        public int size() {        return nItems;    }    public String toString() {        StringBuffer sb = new StringBuffer();        for (int i = rear; i >=0; i--) {            sb.append("" + queArr[i] + " ");        }        return sb.toString();    }}public class QueueApp {    public static void main(String[] args) {        QueueT theQueue = new QueueT(10);        theQueue.insert(39);        theQueue.insert(23);        theQueue.insert(12);        theQueue.insert(54);        theQueue.insert(63);        theQueue.insert(36);                System.out.print(theQueue);        System.out.println();        if (!theQueue.isEmpty())            System.out.println("删除" + theQueue.remove());        System.out.println("------------------");        System.out.print(theQueue);            }}