//第一个
1 public class Cardemo{ 2 public static void main(String[] args){ 3 Car carwind = new Car(60,"red","west"); 4 carwind.speed = 60; 5 carwind.color = "red"; 6 carwind.direction = "west"; 7 8 System.out.println("The speed of car is " + carwind.speed); 9 System.out.println("The color of car is " + carwind.color); 10 System.out.println("The direction of car is " + carwind.direction); 11 } 12 } 13 class Car{ 14 //定义四个成员变量（属性） 15 int speed; 16 String color; 17 String name; 18 String direction; 19 }
第二个
public class Cardemo{ public static void main(String[] args){ Car carwind = new Car(60,"red","west"); //创建一个Car类的引用 carwind.speed = 60; carwind.color = "red"; carwind.direction = "west"; System.out.println("The speed of car is " + carwind.speed); System.out.println("The color of car is " + carwind.color); System.out.println("The direction of car is " + carwind.direction); carwind.drivecar(); carwind.speedup(5); System.out.println("The speed of car is " + carwind.speed); } } class Car{ //定义四个成员变量（属性） int speed; String color; String name; String direction; Car(int speed, String color, String direction){ this.speed = speed; this.color = color; this.direction = direction; } public void drivecar(){ System.out.println("here we go!"); } public void speedup(int aspeed){ this.speed = speed + aspeed; } }