public class TestCar {     public static void main(String[] args) {         Car c1 = new Car();         c1.color = "red";         c1.brand = "xxx";//如果这辆汽车有很多属性，这样一一赋值不是很麻烦？有没有办法一生产出来就设定它的属性（初始化）吗？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("汽车颜色:%s, 汽车品牌:%sn", color, brand);     }   }

/*什么是构造方法*/ 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;             //这里的this是这个对象的意思.第一个color是这个对象的color属性，第二个是局部变量color         this.brand = brand;             //同上     }       void run() {         System.out.printf("I am running...running..running~~~~n");     }       void showMessage() {         System.out.printf("汽车颜色:%s, 汽车品牌:%sn", color, brand);     }   }