Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / javamasque
Static Variable:
• The variables are class variables.
• These come into existence as class in loaded into JVM.
• The variable remains live as long as class is exists in JVM or garbage collected.
• The variable’s state is common for all instances of the belonging class.
• If any instance of belonging to class modify the value of static variable then the modified value reflects for all.
• Static variables are only accessible in static method only.
• As a good practice, it should be referenced by Class name not by instance.
Static Method:
• The methods are class methods.
• The method is equally defined for all instances the class.
• It is good practice, the static method should be referenced by its class name instead of instance variables.
• This method can only access static variables but not the instance variables.
• Static method will be overloaded but won’t be overridden.
• As there is a common functionality that will be used for a set of other classes in an application, then we have to keep the functionality in static method.
• Mostly factory pattern and singleton pattern use static method.
• Utility classes use static methods
Static Class
• Only a nested class can be static class, top-level class can’t be static.
• A static nested class can only access static members of top-level class.
• A static nested does not require an instance of top-level class to be instantiated.
<<Top-level class name>>.<<Inner static class name>> newClass = new <<Top-level class name>>.<<Inner static class name>>();
• It is completely separate class that has no link with instance of top-level class.
Static block
• Static block is used to initialize static variables of a class.
• Static block is loaded at once at the time of class loading.
• This block may present anywhere in java source but it is executed before constructor at run time.
• If there is multiple static blocks, then it is executed in a sequence as it is found in source file.
| Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
What are different access specifiers in java? Explain
Explain the purpose of garbage collection in Java?
Explain wait(), notify() and notifyall() methods of object class ?
Explain the different forms of polymorphism?
Can you override static methods?
how can you take care of mutual exclusion using java threads? : Java thread
Can a class extend 2 classes in java?
Why are getters and setters used?
What are the different http methods?
What is pojo class in java?
What do you mean by of string::valueof expression in java 8?
Explain 5 features introduced in jdk 1.7?
What are the advantages of unicode?
What is the main purpose of java?
What is difference between static class and singleton pattern?
