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What is the use of static factory method in java?
A static factory method is a public static method on the object that returns a new instance of the object. These type of methods share the same benefits as the traditional factory method design pattern. This is especially useful for value objects that don’t have a separate interface and implementation class.
What is the purpose of using java Util calendar?
Calendar class in Java is an abstract class that provides methods for converting date between a specific instant in time and a set of calendar fields such as MONTH, YEAR, HOUR, etc. It inherits Object class and implements the Comparable, Serializable, Cloneable interfaces.
Why do we need factory method in java?
Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. Factory Method defines a method, which should be used for creating objects instead of direct constructor call ( new operator).
Is calendar thread safe Java?
In short, the Calendar class is not thread-safe, and GregorianCalendar isn’t either because it inherits the non-thread-safe fields and methods.
Which package is used for date in Java?
java.util package
The class Date represents a specific instant in time, with millisecond precision. The Date class of java. util package implements Serializable, Cloneable and Comparable interface. It provides constructors and methods to deal with date and time with java.
What are the advantages of factory method?
Advantage of Factory Design Pattern Factory Method Pattern allows the sub-classes to choose the type of objects to create. It promotes the loose-coupling by eliminating the need to bind application-specific classes into the code.
What’s the purpose of the calendar class in Java?
The class also provides additional fields and methods for implementing a concrete calendar system outside the package. Those fields and methods are defined as protected . Like other locale-sensitive classes, Calendar provides a class method, getInstance, for getting a generally useful object of this type.
What is the idea of static factory method?
The key idea of static factory method is to gain control over object creation and delegate it from constructor to static method. The decision of object to be created is like in Abstract Factory made outside the method (in common case, but not always).
When do you need a factory in Java?
Generally factories are useful when you know that you need a new instance of a class that implements some interface but you don’t know the implementing class. This is useful when working with hierarchies of related classes, a good example of this would be a GUI toolkit.
Why are the Constructors marked static in Java?
The constructors are marked private, so they cannot be called except from inside the class, and the factory method is marked as static so that it can be called without first having an object. There are a few advantages to this pattern.