The Java constructor example of the of constructor

TestCar. Java

public class TestCar {
    public static void main(String[] args) {
        Car c1 = new Car();
        c1.color = "red";
        c1.brand = "xxx";//If the car has a lot of properties, wouldn't it be too much trouble to assign them all? Is there a way to set its properties as soon as it is produced? There's ~~~ look below & NBSP;          
    }   
}
class Car {
    String color;
    String brand;
    void run() {
        System.out.printf("I am running...running..running~~~~n");
    }   
    void showMessage() {
        System.out.printf(" Car color :%s,  Car brand :%sn", color, brand);
    }   
}

Improved testcar_ex.java

public class TestCar_EX {
    public static void main(String[] args) {
        Car c1 = new Car("red", "xxx");
    }   
}
class Car {
    String color;
    String brand;
    public Car(String color, String brand) {
        this.color = color;             //The first color is the color property of the object, and the second is the local variable color
        this.brand = brand;             //Same as above
    }   
    void run() {
        System.out.printf("I am running...running..running~~~~n");
    }   
    void showMessage() {
        System.out.printf(" Car color :%s,  Car brand :%sn", color, brand);
    }   
}