abstract class BaseLogger { abstract log(msg: string): void }// Error! Non-abstract class 'DebugLogger' does not implement inherited abstract member 'log' from class 'BaseLogger'.class DebugLogger extends BaseL
We can’t instantiate Base with new because it’s abstract. Instead, we need to make aderived classand implement the abstract members: 我们不能用 new 实例化 Base,因为它是抽象的。 相反,我们需要创建一个派生类并实现抽象成员: // @errors: 2511abstractclassBase{// 抽象方法abstractgetName():stri...
The find() method is an abstract method and so must be defined in the derived class. The Employee class derives from the Person class and so it must define the find() method as abstract. The Employee class must implement all the abstract methods of the Person class, otherwise the compiler...
abstract class A { abstract m(): void; } 在继承(extends)方面,就像C#或者java里面那样,我可以像下面这样来继承这个抽象类: //TypeScript class B extends A{ } 但是在实现方面(implement),在TypeScript中也可以去implement一个类: class C implements A { m(): void { } } 那么问题来了:类B和类C在...
class Derived extends Base { getName() { return "world"; } } const d = new Derived(); d.printName(); 注意,如果我们忘记实现基类的抽象成员,我们会得到一个报错: class Derived extends Base { // Non-abstract class 'Derived' does not implement inherited abstract member 'getName' from class...
d. 找到"Code Actions: Implement Interface"选项,将其设置为"true",这样在实现接口时会自动添加相应的方法。 e. 找到"Code Actions: Implement Abstract Class"选项,将其设置为"true",这样在实现抽象类时会自动添加相应的方法。 f. 保存设置并关闭设置页面。
abstract class Animal{ constructor(public name:string) { this.name = name } abstract getName(){} // Error: Method 'getName' cannot have an implementation because it is marked abstract. } class Cat extends Animal{ // Error: Non-abstract class 'Cat' does not implement inherited abstract mem...
TypeScript(和 JavaScript) 并没有名为静态类(static class)的结构,但是像 C# 和 Java 有。 所谓静态类,指的是作为类的静态成员存在于某个类的内部的类。比如这种: // java public class OuterClass { private static String a = "1"; static class InnerClass { ...
TypeScript(和 JavaScript) 并没有名为静态类(static class)的结构,但是像 C# 和 Java 有。 所谓静态类,指的是作为类的静态成员存在于某个类的内部的类。比如这种: // java public class OuterClass { private static String a = "1"; static class InnerClass { ...
name = name; } public abstract sayHi(); } class Cat extends Animal { public eat() { console.log(`${this.name} is eating.`); } } let cat = new Cat('Tom'); // index.ts(9,7): error TS2515: Non-abstract class 'Cat' does not implement inherited abstract member 'sayHi' from ...