类图: 父类(车类,抽象类) /// <summary> /// 车辆基本信息类.搞一个抽象类玩玩 /// </summary> public abstract class Vehicle { public string Color { get; set; }//颜色 public double DailyRent { get; set; }//日租金 public string LicenseNo { get; set; }//车牌号 public string Name { g
Truck.cs类 //卡车类 public class Truck : Vehicle1 { //重载 public int Load { get; set; } //构造函数 public Truck(string color, double dailyrent, string licenseNO, string name, int rentDate, string rentUser, int yearsOfService, int load) :base(color, dailyren
Java 如何获取系统时间 import java.text.SimpleDateFormat; import java.util.Date; public class Test { public static void main(String[] args) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 设置日期格式 System.out.println(df.format(new Dat
Java 虚拟机规范中说明:所有的对象实例(all class instances)以及数组都要在堆上分配: the heap is the runtime data area from which memory for all class instances and arrays is allocated. 0. 访问修饰符,static,栈内存 Java Error - Illegal Modifier for Parameter - Only final Permitted 函数内的局部变