在C#中创建对象的不同方法有哪些（） _Java创建对象的方法

完全面向对象的语言意味着所有内容都表示为一个对象, 但是不能区分原始类型和类的对象, 但是C#并非纯粹面向对象, 因为它支持许多过程编程概念, 例如某种程度上的指针。对象是面向对象编程的基本单元, 代表现实生活中的实体。一个典型的C#程序会创建许多对象, 你知道这些对象通过调用方法进行交互。我们可以通过以下方式在C#中创建对象：
1)使用” new” 运算符：类是引用类型, 并且在运行时, 除非使用new运算符声明该引用类型的任何对象, 否则它将为该对象分配空值。新操作符仅在运行时才将内存中的空间分配给对象, 这意味着分配是动态的。
语法如下：

//The className() is a call //to the constructor className ObjectName = new className();

注意：的建设者可以是默认构造函数, 也可以是用户定义的构造函数。
例子：

//C# Program to show the use //of the new Operator using System; namespace NewOperator {class Rectangle {public int length, breadth; //Parameterized Constructor //User defined public Rectangle( int l, int b) { length = l; breadth = b; }//Method to Calculate Area //of the rectangle public int Area() { return length * breadth; } }//Driver Class class Program {//Main Method static void Main( string [] args) { //Creating an object using 'new' //Calling the parameterized constructor //With parameters 10 and 12 Rectangle rect1 = new Rectangle(10, 12); //To display are of the Rectangle int area = rect1.Area(); Console.WriteLine( "The area of the" + " Rectangle is " + area); } } }

输出如下：

The area of the Rectangle is 120

2)创建对现有对象的引用：只能使用类名和引用名声明引用。该引用不能独立存在。必须将其分配给相同类的现有对象。对引用所做的任何更改都将保存到引用的对象中。这有点像别名。
语法如下：

className RefName; RefName = objectName;

例子：

//C# Program to show the use //of references using System; namespace Reference {class Triangle {public int side, altitude; //Not defining a constructor//Method to calculate area //of the Triangle public double Area() { return ( double )0.5 * side * altitude; } }//Driver Class class Program {//Main Method static void Main( string [] args) { //Creating an object using new //calls the default constructor Triangle tri1 = new Triangle(); //Only creates a reference of //type Triangle Triangle tri2; //Displaying area of tri1 Console.WriteLine( "Area of tri1 is " + tri1.Area()); //Assigns the reference to tri1 tri2 = tri1; //Making changes in tri2 tri2.side = 5; tri2.altitude = 7; //Displaying area of tri1 //Changes made in the reference tri2 //are reflected in tri1 also Console.WriteLine( "Area of tri1 is " + tri1.Area()); } } }

输出如下：

Area of tri1 is 0 Area of tri1 is 17.5

3)创建对象数组：如果需要多个相同类的对象, 则可以创建一个对象数组。这将要求你首先声明数组, 然后初始化每个元素{在这种情况下为object}。你可以使用for循环进行初始化。
语法如下：

className[] arrayName = new className[size];

//C# Program to illustrate how to //create the array of objects using System; namespace ArrayofObjects {class Circle {public int radius; //Definig Constructor public Circle() { radius = 0; }//Method to set value of radius public void setValue( int r) { radius = r; }//Method to calculate the //area of the Circle public double Area() { return ( double )3.14 * radius * radius; } }//Driver Class class Program {//Main Method static void Main( string [] args) { //To declare an array of two objects Circle[] circleArray = new Circle[2]; //Initialize the objects circleArray[0] = new Circle(); circleArray[1] = new Circle(); //to set values for the radius circleArray[0].setValue(1); circleArray[1].setValue(2); //for loop to display areas for ( int i = 0; i < circleArray.Length; i++) { Console.Write( "Area of circle with radius " + (i + 1)); Console.Write( " is " + circleArray[i].Area() + "\n" ); } } } }

【在C#中创建对象的不同方法有哪些（）】输出如下：