以下代码是分在三个class文件的。贴到一起//创建一个Vehicle的父类public class Vehicle {int paasenger;}//创建一个Car的子类public class Car extends Vehicle {int passenger = 4;}//执行public class initial {public static void main(String[] args) {Vehicle obj1 = new Car();System.out.println(obj1.passenger);}}结果是4