我的班级已经开始使用队列，我们的指示是重写 toString() 方法并返回一个字符串。不使用默认方法，不知道如何将数组转换成字符串形式[element, element, element] 进行返回。到目前为止，这是我的代码。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...
}
}