public class TestCar {
    public static void main(String[] args) {
        Car c1 = new Car();
        c1.color = "red";
        c1.brand = "xxx";//如果這輛汽車有很多屬性，這樣一一賦值不是很麻煩？有沒有辦法一生產出來就設定它的屬性（初始化）嗎？有~~~看下面       
    }   
}

class Car {
    String color;
    String brand;

    void run() {
        System.out.printf("I am running...running..running~~~~\n");
    }  

    void showMessage() {
        System.out.printf("汽車顏色:%s, 汽車品牌:%s\n", color, brand);
    }   
}

/*什么是構造方法*/
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;             //這里的this是這個對象的意思.第一個color是這個對象的color屬性，第二個是局部變量color
        this.brand = brand;             //同上
    }  

    void run() {
        System.out.printf("I am running...running..running~~~~\n");
    }  

    void showMessage() {
        System.out.printf("汽車顏色:%s, 汽車品牌:%s\n", color, brand);
    }   
}