我已经创建了一个自定义类，它可以获取日期和时间作为字符串，我想访问对象和设置数据到类的任何建议

Question

我已经创建了一个自定义类，它可以以字符串的形式获取日期和时间，我想访问对象并将数据设置到类中任何建议这里是我的代码

public class DateTime {
private String Date;
private String Time;

public DateTime(String Date,String Time) {
    this.Date=Date;
    this.Time=Time;

}

public void showDateAndTime() {

    System.out.println("entery Date is :");
    System.out.println(Date);
    System.out.println("entery time is :");
    System.out.println(Time);

}
}

public class Vehicle {

        public int ID;
        public String Brand;
            public String type;
        public DateTime entryTimeDate;

}

public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);


        Vehicle v1=new Vehicle();
        v1.entryTimeDate**********
}

Answer 1

与其在vehicle类中具有public字段，不如将它们设为private字段，然后使用访问器和赋值器方法来获得对它们的访问权。那么vehicle.getEntryTimeDate()就足以为您提供车辆的DateTime对象。换句话说：

public class Vehicle {
    private int id;
    public String brand;
    public String type;
    public DateTime entryTimeDate;

    public Vehicle()
    {
        setId(0);
        setBrand("");
        setType("");
        setEntryTimeDate(new DateTime("DATE", "TIME"));
    }

    public Vehicle(int id, String brand, String type, DateTime entryTimeDate) {
        this.id = id;
        this.brand = brand;
        this.type = type;
        this.entryTimeDate = entryTimeDate;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public DateTime getEntryTimeDate() {
        return entryTimeDate;
    }

    public void setEntryTimeDate(DateTime entryTimeDate) {
        this.entryTimeDate = entryTimeDate;
    }

    public static class DateTime{
        private String date;
        private String time;

        public DateTime(String date,String time) {
            this.setDate(date);
            this.setTime(time);

        }

        public String getTime() {
            return time;
        }

        public void setTime(String time) {
            this.time = time;
        }

        public String getDate() {
            return date;
        }

        public void setDate(String date) {
            this.date = date;
        }
    }

    public static void main(String[] args) {
        Vehicle v1 = new Vehicle();
        v1.getEntryTimeDate().setTime("Time of the vehicle");
        v1.getEntryTimeDate().setDate("Date of the vehicle.");
    }
}

一些注意事项：忽略datetime类中的statice关键字。我这样做是为了创建一个SSCCE。还要注意我遵循的字段命名约定（camel-case）。它是Java程序员使用最多的命名约定。