MyArray.h
#pragma once
#include <iostream>
using namespace std;

class MyArray
{
public:
	MyArray(); //默认构造 默认100容量
	MyArray(int capacity);
	MyArray(const MyArray& array);

	~MyArray();

	//尾插法
	void push_Back(int val);

	//根据索引获取值
	int getDate(int index);

	//根据索引设置值
	void setDate(int index, int val);

	//获取数组大小
	int getSize();

	//获取数组大小
	int getCapacity();
    
    //[]运算符重载
	int& operator[](int index);


private:
	int* pAddress; //指向真正储存数据的指针
	int m_Size; //数组大小
	int m_Capacity; //数组容量

};

MyArray.cpp
#include "MyArray.h"
    
//默认构造
MyArray::MyArray()
{
	this->m_Capacity = 100;
	this->m_Size = 0;
	this->pAddress = new int[this->m_Capacity];
}

//有参构造
MyArray::MyArray(int capacity)
{
	//cout << "有参函数调用" << endl;
	this->m_Capacity = capacity;
	this->m_Size = 0;
	this->pAddress = new int[this->m_Capacity];
}

//拷贝构造
MyArray::MyArray(const MyArray& array)
{
	//cout << "拷贝构造函数调用" << endl;
	this->pAddress = new int[array.m_Capacity];
	this->m_Size = array.m_Size;
	this->m_Capacity = array.m_Capacity;

	for (int i = 0; i < array.m_Size; i++)
	{
		this->pAddress[i] = array.pAddress[i];
	}
	
}

//析构
MyArray::~MyArray()
{
	if (this->pAddress != NULL)
	{
		//cout << "析构函数调用" << endl;
		delete[] this->pAddress;
		this->pAddress = NULL;
	}
}

void MyArray::push_Back(int val)
{
	this->pAddress[this->m_Size] = val;
	this->m_Size++;
}

int MyArray::getDate(int index)
{
	return this->pAddress[index];
}

void MyArray::setDate(int index, int val)
{
	this->pAddress[index] = val;
}

int MyArray::getSize()
{
	return this->m_Size;
}

int MyArray::getCapacity()
{
	return this->m_Capacity;
}

//[]重载的实现
int& MyArray::operator[](int index)
{
	return this->pAddress[index];
}

C++强化训练-数组类的封装.cpp

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include"MyArray.h"
using namespace std;

void test01()
{
	//堆区创建数组
	MyArray* array = new MyArray(30);

	MyArray* array2 = new MyArray(*array); //new的方式指定调用拷贝构造
	MyArray array3 = *array; //构造函数返回的本体

	//MyArray* array2(array);  //这个是声明一个指针 和array执行的地址相同


	//尾插法测试
	for (int i = 0; i < 10; i++)
	{
		array2->push_Back(i);
	}
	//获取数据测试
	for (int i = 0; i < 10; i++)
	{
		cout << array2->getDate(i) << endl;
	}

	//设置值测试
	array2->setDate(0, 1000);
	cout << array2->getDate(0) << endl;

	//获取数组大小
	cout << "array2的数组大小为： " << array2->getSize() << endl;

	//获取数组容量
	cout << "array2的数组容量为： " << array2->getCapacity() << endl;
    
    //获取设置数组内容 如何用[]进行设置访问：[]运算符重载
	array3.push_Back(100000);
	cout << array3.getDate(0) << endl;
	cout << array3[0] << endl;
	array3[0] = 100;
	cout << array3[0] << endl;

	delete array;
}

int main()
{
	test01();
	system("pause");
	return EXIT_SUCCESS;
}