Java 项目 - 覆盖 toString() 方法并返回一个字符串

Question

我的类已经开始处理队列，我们的指令是覆盖toString（）方法并返回一个字符串。 如果不使用默认方法，我不知道如何将数组转换为字符串形式 [元素、元素、元素] 以进行返回。 这是我到目前为止的代码。 我的队列工作正常，我不需要任何输入...只是 toString（） 方法返回。

package edu.ben.cis205;
public class MyQueue {
    //Create array
    public int[] array = new int[10];
    //Create variables to track number of elements and pointer positions
    private int first = 0;
    private int last = 0;
    private int numberOfElements = 0;
    public int peek() {
        //Returns first element in array
        if (numberOfElements > 0)
            return array[first];
        else {
            System.out.println("No integers in array.");
            return 0;
        }
    }
    public boolean add(int inputNumber) {
        //Adds input to array
        //Checks for room at back of array
        if (numberOfElements < array.length && last < array.length) {
            array[last] = inputNumber;
            last++;
            numberOfElements++;
            return true;
        //Checks for room at front of array
        } else if (numberOfElements < array.length && last == array.length) {
            last = 0;
            array[last] = inputNumber;
            last++;
            numberOfElements++;
            return true;
        } else {
            return false;
        }
    }
    public int getSize() {
        //Returns number of elements in array
        return numberOfElements;
    }
    public boolean isFull() {
        //Returns true if full
        if (numberOfElements == array.length)
            return true;
        else
            return false;
    }
    public boolean isEmpty() {
        //Returns true if array is empty
        if (numberOfElements == 0)
            return true;
        else
            return false;
    }
    public int remove() {
        //Removes element at front of array
        //Checks for elements and moves pointer to next array position
        if (numberOfElements > 0 && first < array.length) {
            int returnValue = array[first];
            first++;
            numberOfElements--;
            return returnValue;
        //Checks for elements and moves pointer to front if at final position
        } else if (numberOfElements > 0 && first == array.length) {
            first = 0;
            int returnValue = array[first];
            first++;
            numberOfElements--;
            return returnValue;
        //Returns an int value of 0 if array is empty
        } else {
            return 0;
        }
    }
    public int getCapacity() {
        //Returns array size
        return array.length;
    }
    public int getRemainingCapacity() {
        //Returns remaining spaces in array
        return array.length - numberOfElements;
    }
    //ERROR IN METHOD
    public String toString() {
        //Int establishes where to start in the array.
        int arrayPointer = first;
        //New array established to put queue in order.
        int stringArray[] = new int[numberOfElements];
        //This code reconstructs the queue in the correct order
        if (numberOfElements != 0) {
            for (int i = 0; i < numberOfElements; i++) {
                stringArray[i] = array[arrayPointer];
                if (arrayPointer < (array.length - 1))
                    arrayPointer++;
                else 
                    arrayPointer = 0;
            }
        } else
            return null;
        // ??? Do not know how to change the new array (stored now in the correct order) into a String return...
    }
}

Answer 1

使用

Arrays.toString（array[]）

以 [item1， item2， item3] 表示形式获取数组