상속 상속

[주인장]

* Shape.ts

export class Shape {

    constructor(private _x: number, private _y: number) {

    }

    public get x(): number {

        return this._x;

    }

    public set x(value: number) {

        this._x = value;

    }

    public get y(): number {

        return this._y;

    }

    public set y(value: number) {

        this._y = value;

    }

    public getInfo(): string {

        return `x=${this._x}, y=${this._y}`;

    }

}

* Circle.ts 

import { Shape } from "./Shape";

export class Circle extends Shape {

    constructor(theX: number, theY: number, private _radius: number) {

        super(theX, theY);

    }

    public get radius(): number {

        return this._radius;

    }

    public set radius(value: number) {

        this._radius = value;

    }

    // Override : 메소드 재정의

    public getInfo(): string {

        return super.getInfo() + `, radius=${this._radius}`;

    }

}

* Driver.ts

import { Shape } from "./Shape";

import { Circle } from "./Circle";

let myShape = new Shape(10, 15);

console.log(myShape.getInfo());

let myCircle = new Circle(5, 10, 20);

console.log(myCircle.getInfo());

<<결과>>

x=10, y=15
x=5, y=10, radius=20