Writing a class: fields, constructor, methods · ⁨การเขียนคลาส: ฟیلด์, คอนสตรัคเตอร์, เมทโด้⁩

public class Dog {
    String name;   // instance variable
    int age;       // instance variable
}

public class Dog {
    String name;
    int age;

    // Constructor: runs when we make a new Dog
    public Dog(String name, int age) {
        this.name = name;   // this.name is the field; name is the parameter
        this.age = age;
    }
}

public class Dog {
    String name;
    int age;

    public Dog(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Instance method: returns a sentence about this dog
    public String describe() {
        return this.name + " is " + this.age;
    }
}

public class Main {
    public static void main(String[] args) {
        Dog d = new Dog("Rex", 4);
        System.out.println(d.describe());   // Rex is 4
    }
}

class Dog {
    String name;
    int age;

    public Dog(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String describe() {
        return this.name + " is " + this.age;
    }
}