Java에서 클래스란 무엇입니까? 수업 관련 소개

class Point{
    constructor(){

    }

    toString(){

    }
}

console.log(Object.keys(Point.prototype))
console.log(Object.getOwnPropertyNames(Point.prototype))

console.log(typeof Point)  // "function"
console.log(Point ===Point.prototype.constructor)  // true

class Point{}
Point.prototype = {
    constructor() {},
    toString() {},
}

console.log(Object.keys(Point.prototype))  // []
console.log(Object.getOwnPropertyNames(Point.prototype))  // ["constructor", "toString"]

class ColorPoint extends Point {
    constructor(x, y, color) {
        super(x, y) // 调用父类的 constructor(x, y)
        this.color = color
    }

    toString() {
        return this.color + '' + super.toString() // 调用父类的 toString()
    }
}

class XXXXX extends Component{}