class
Car {
String color = "red";
int num = 4;
void run() {
System.out.println("Color" + color);
}
}
class
CarDemo {
public static void main(String[] args){
Car c=new Car();
c.color = "green";
c.num = 5;
c.run();
}
}
原文：http://www.cnblogs.com/mabel/p/5834348.html