我有一个library(ggplot2)
data(economics_long)
economics_long$date2 <- as.numeric(economics_long$date) + 915
ggplot(economics_long, aes(date2, value01, colour = variable)) +
geom_line()
和Vehicle的班级
Car
让我们举个例子
Vehicle extends Car现在，当我从仓库中获取汽车对象时，我将获得 Class Vehicle {
String vehicleMade;
boolean fourWheeler;
Vehicle(String vehicleMade, boolean fourWheeler) {
this.vehicleMade=vehicleMade;
this.fourWheeler=fourWheeler;
}
// getters and setters
}
Class Car extends Vehicle {
String model;
Car(String vehicleMade, boolean fourWheeler) {
super(vehicleMade, fourWheeler);
}
// getters and setters
}
Class JavaMainClass {
private static CarInfoRepository carInfoRepo;
private static AnnotationConfigApplicationContext ctx;
public static void main(String args[]) {
carInfoRepo= ctx.getBean(CarInfoRepository.class);
//Now where I have doubt and problem
Car carInfo = new Car("Bentley", true);
carinfo.setModel("Flying Spur");
log.debug(carInfo.getVehicleMade); // I get Bentley here
carInfoRepo.save(carInfo);
}
}
和 vehicleMade 属性为fourWheeler
您可以看到在保存之前获得null的时间，但是保存到存储库后，我得到的属性为null。