How Can We Make Class Immutable in Java with Date Field?
We Will Understand What These Guidelines Mean Actually by Creating an Immutable Class with Mutable Object with Date Field. Don't Provide “Setter” Methods...
- Don't provide “setter” methods — methods that modify fields or objects referred to by fields.
- Make all fields final and private.
- Don't allow subclasses to override methods.
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Also, how can we make a class immutable in Java?
Immutable Class in Java
- Declare the class as final so it can't be extended.
- Make all fields private so that direct access is not allowed.
- Don't provide setter methods for variables.
- Make all mutable fields final so that it's value can be assigned only once.
- Initialize all the fields via a constructor performing deep copy.
Furthermore, what is the use of immutable class in Java? Immutable class means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. We can create our own immutable class as well.
Regarding this, is Date class immutable in Java?
Date is not immutable, we need to make a defensive copy of java. util. Date field while returning a reference to this instance variable. Let's create a hypothetical person class that has name and dob as the only two members.
How can we make an object immutable?
To make object immutable, You must do these steps:
- Don't use any methods, which can change fields of your class. For example don't use Setters.
- Avoid to use public non-final fields. If your fields is public then you must declare them as final and initialize them in constructor or directly in the declaration line.
