如何实例化int类型的Stacks数组？ [英] How can I instantiate an array of Stacks of type int?

问题描述

我正在尝试创建一个堆栈数组，其中该数组中的每个堆栈的类型为 int 。



如果我这样创建数组：  Stack< Integer> []数字=新的Stack< Integer> [3];   ;，会出现编译错误 无法创建Stack 的通用数组。因此，我尝试使用通配符类型而不是 Integer 创建堆栈数组， 然后 not 没有此错误。



但是，如果我尝试将 int 推入堆栈之一（通配符 ？类型），就像这样：  this.numbers [stackIndex] .push（i）;   ;，有编译错误  类型Stack< capture＃1-of？>中的方法push（capture＃1-of？）不适用于参数（int）。



那么，如何正确实例化 int 类型的堆栈数组？到目前为止，我无法在这些堆栈上执行推入/弹出操作...

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我的理由是尝试对Tower进行编程河内游戏。我希望这三根棒都成为 int 类型的 Stack ，每个环都表示为 int ，并将这三个标尺组合在一起，作为三个堆栈的数组。

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这是一些示例代码：

I am trying to create an array of stacks, in which each stack within the array is of type int.

If I create the array like this:  Stack<Integer>[] numbers = new Stack<Integer>[3]; , there is the compile error  "Cannot create a generic array of Stack<Integer>". So, I am trying to create the array of Stacks with the wildcard type instead of Integer,  and it then does not have this error.

However, if I then try to push an int into one of the stacks (of wildcard "?" type) like this:  this.numbers[stackIndex].push(i); , there is the compile error  "The method push(capture#1-of ?) in the type Stack<capture#1-of ?> is not applicable for the arguments (int)".

So, how can I properly instantiate an array of Stacks of type int? As of now I am not able to perform push/pop operations on these Stacks...

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My reasoning in this is an attempt to program the Tower of Hanoi game. I wanted each of the three rods to be a Stack of type int, each ring to be represented as an int, and the three rods together to be contained as an array of the three Stacks.

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Here is some example code:

import java.util.Stack;

public class StackTest {

    Stack<?>[] numbers;

    public StackTest(int stackLength) {
        this.numbers = new Stack<?>[stackLength];
    }

    public void fillStack(int stackIndex, int numRings) {
        for (int i = numRings; i >= 0; i--) {

            // this statement has a compile error!
            this.numbers[stackIndex].push(i);
        }
    }

    public static void main(String[] args) {
        int numberOfRods = 3;
        StackTest obj = new StackTest(numberOfRods);

        int rodNumber = 0, numberOfRings = 4;
        obj.fillStack(rodNumber, numberOfRings);
    }
} // end of StackTest

推荐答案

它必须是原始的 Stack [] ，也可以使用 List< Stack< YourClass>> lstStack = new ArrayList< Stack< YourClass>>（）。

It has to be a raw Stack[] or you can use List<Stack<YourClass>> lstStack = new ArrayList<Stack<YourClass>>().

在这种情况下，我宁愿使用

In this case, I would prefer to use

List<Stack<Integer>> lstStack = new ArrayList<Stack<Integer>>(stackLength);

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