INTERVIEW QUESTIONS J2EE CORE JAVA DETAILS

Question: What does it mean that a method or field is “static”?

Answer: Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all instances of that class. Static methods can be referenced with the name of the class rather than the name of a particular object of the class (though that works too). That’s how library methods like System.out.println() work. out is a static field in the java.lang.System class.

Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all instances of that class. Static methods can be referenced with the name of the class rather than the name of a particular object of the class (though that works too). That’s how library methods like System.out.println() work. out is a static field in the java.lang.System class. Source: CoolInterview.com

static key word is prefixed with field are method that is not issu in both case the memory is first allocated and aso to break the oops concept rule Source: CoolInterview.com

Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all instances of that class. Static methods can be referenced with the name of the class rather than the name of a particular object of the class (though that works too). That?s how library methods like System.out.println() work. out is a static field in the java.lang.System class.

Source: CoolInterview.com

Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all instances of that class. Static methods can be referenced with the name of the class rather than the name of a particular object of the class (though that works too). That?s how library methods like System.out.println() work. out is a static field in the java.lang.System class. Source: CoolInterview.com

Basically, static methods will be written in an application when user need to do static logic irrespective of the object wise coding. Similarly, static methods will be accessed at class level.

User cannot access the static methods or static variables by using object.

So, we don't have scenario like if one object changes the value of static variable the same will be updated in all other objects :)

And, in contrast to static variables or methods we will have object methods and variables which will be stored in object specific memory and accessed by its own object instance.

Source: CoolInterview.com

static members are called class members.class members are initialized only once ,at the time the class is loaded in to jvm.class members have only one copy for particular application and same copy used by all instances of that class. Source: CoolInterview.com

All of the basic, we make the method static when we want to access that method before the class is instantiated. (i.e. calling the method without any object) and so is the main() method static. Source: CoolInterview.com

If a member (ie methods & Fields) is declared as static then those things are belong to Class rather than Instances. You can access these static fields by using Class name.These members are also known as class members. Source: CoolInterview.com

The static method or the fields can be instantiated only once per class. Any changes made to the static method will reflect within the scope. More over the the methods or the fields cannot be inherited. Source: CoolInterview.com

static data can be accessed by only static members because this we can access any static member of other class in "public static void main()" function.
it is not instance variables or method it can be called by either object of that class or by using that class name.
The memory for the static members can be allocated at only ones. Source: CoolInterview.com

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