????? ?? ??? Java? ????? ?????? ?? ??????. ? ??? Python?? ? ??? ??????. ?? Java? ?? ??? ?? ????, ?? ?? ?????(OOP), ??? ??, JDBC? ?? ?????? ??? ??? ? 3~4??? ??????.

???? JavaScript? ???? ? ??? ??????. ?? ?? JavaScript? ??? ? Java? JavaScript? ?? ???? ??? ??? ??? ??? ?? ??? ???? ???? ????.

?? ???

?? ?? ?? ???? ??? ?? ??? ????. JavaScript? Java? ?? ??? ?? ???? ?????. ? ?? ?? ?? ???? ??? ?? ???? ??? ?????. ?, JavaScript? ?? ??? ??? Java? ?? ??? ??? ?????.

Java? JavaScript: ??? ??

??? ???? ???? ???? ??? ???. ??? ??? ? ??? ?? ???? ???? ???. ??? JavaScript? ??? ??? ?????. ??? ???? ?? ????? ??? ?????. ??? ??? ???? ??? ?????.

??? ?? ??

Java??? ??? ??? ? ???? ??? ?? ??(?: String, int, float, boolean)? ?????. ??? JavaScript? ?????. ??? let ?? const(???)? ???? ???? ?? ??? ???? ?????. var? ??? ??? ?????? ??? let? const? ?????.

?? ?:

class Main {
    public static void main(String[] args) {
        int a = 5;
        int b = 6;
        int result = a + b;
        System.out.println(result);
    }
}

?????? ?:

let a = 5;
let b = 6;

let sum = a + b;

console.log("The sum is: " + sum);

Java? JavaScript? OOP ??

??????? OOP? ????? ????? ?? ???? ?? ?????. JavaScript? ?? ??? ??? ????? ???? ?????? ?? ??? ?????. ES6 ?? JavaScript? ???? ?? OOP? ???? ????? ????? ?????? ?????.

?? ?? ??? ??? ? ??? ??? ?? ???? ?????.

??:

class Person {
    String name;

    Person(String name) {
        this.name = name;
    }

    void greet() {
        System.out.println("Hello, " + name);
    }

    public static void main(String[] args) {
        Person person = new Person("John");
        person.greet();
    }
}

??????:

class Person {
    constructor(name) {
        this.name = name;
    }

    greet() {
        console.log(`Hello, ${this.name}`);
    }
}

const person = new Person("John");
person.greet();

JavaScript? ?? ??

Java?? ?? ???? ??? ??? ?????. JavaScript? ???? ?????. ???? ??? ?? ?? ??? ?? ??? ? ????.

Java??? ?? ??? ???? ????? ??? ?????. JavaScript? ???? ?? ?? ??? ?????.

??????

class Main {
    public static void main(String[] args) {
        int a = 5;
        int b = 6;
        int result = a + b;
        System.out.println(result);
    }
}

?? ????

?? ??? ? ?? ???? ???? ?????.

??:

let a = 5;
let b = 6;

let sum = a + b;

console.log("The sum is: " + sum);

??????:

class Person {
    String name;

    Person(String name) {
        this.name = name;
    }

    void greet() {
        System.out.println("Hello, " + name);
    }

    public static void main(String[] args) {
        Person person = new Person("John");
        person.greet();
    }
}

??? ?? ??

JavaScript? ???? Java?? ????. ??? ???(private, protected, public)? ????. ??? ES2022? ??? #(???? ??) ???? ?? ?? ???? ?? ??? ?????.

class Person {
    constructor(name) {
        this.name = name;
    }

    greet() {
        console.log(`Hello, ${this.name}`);
    }
}

const person = new Person("John");
person.greet();

??? ??

Java? ??? ?? ???(??? ????)? ??? ???(??? ???)? ?????.

JavaScript? ??? ??? ??? ?? ?? ???? ?? ??? ????? ???? ????. ??? ??? ???? ?????.

const person = {
    name: "John",
    greet: function() {
        console.log(`Hello, ${this.name}`);
    }
};

person.greet();

? ??? ?? ???: Java?? JavaScript?? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!