请问关于c的具体应用场景有哪些？

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示例接口声明一个接口IDimensions和一个类Box，实现了接口成员GetLength和GetWidth。

javainterface IDimensions { float GetLength(); float GetWidth();}

class Box implements IDimensions { private float length; private float width;

public Box(float length, float width) { this.length=length; this.width=width; }

@Override public float GetLength() { return length; }

@Override public float GetWidth() { return width; }}

本示例声明一个接口IDimensions 和一个类 Box，显式实现了接口成员 GetLength 和 GetWidth。 通过接口实例 dimensions 访问这些成员。

interface IDimensions { float GetLength(); float GetWidth(); } class Box : IDimensions { float lengthInches; float widthInches; Box(float length, float width) { lengthInches = length; widthInches = width; } // Explicit interface member implementation: float IDimensions.GetLength() { return lengthInches; } // Explicit interface member implementation: float IDimensions.GetWidth() { return widthInches; } static void Main() { // Declare a class instance box1: Box box1 = new Box(30.0f, 20.0f); // Declare an interface instance dimensions: IDimensions dimensions = box1; // The following commented lines would produce compilation // errors because they try to access an explicitly implemented // interface member from a class instance: //System.Console.WriteLine("Length: {0}", box1.GetLength()); //System.Console.WriteLine("Width: {0}", box1.GetWidth()); // Print out the dimensions of the box by calling the methods // from an instance of the interface: System.Console.WriteLine("Length: {0}", dimensions.GetLength()); System.Console.WriteLine("Width: {0}", dimensions.GetWidth()); } } /* Output: Length: 30 Width: 20 */

可靠编程

• 请注意，注释掉了 Main 方法中以下行，因为它们将产生编译错误。 显式实现的接口成员不能从类实例访问：

//System.Console.WriteLine("Length: {0}", box1.GetLength()); //System.Console.WriteLine("Width: {0}", box1.GetWidth());

• 另请注意 Main 方法中的以下行成功输出了框的尺寸，因为这些方法是从接口实例调用的：

System.Console.WriteLine("Length: {0}", dimensions.GetLength()); System.Console.WriteLine("Width: {0}", dimensions.GetWidth());

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