13/05/2008
Java Static Variables
- Java instance variables are given separate memory for storage. If there is a need for a variable to be common to all the objects of a single java class, then the static modifier should be used in the variable declaration.
- Any java object that belongs to that class can modify its static variables.
- Also, an instance is not a must to modify the static variable and it can be accessed using the java class directly.
- Static variables can be accessed by java instance methods also.
- When the value of a constant is known at compile time it is declared ‘final’ using the ‘static’ keyword.
Java Static Methods
- Similar to static variables, java static methods are also common to classes and not tied to a java instance.
- Good practice in java is that, static methods should be invoked with using the class name though it can be invoked using an object. ClassName.methodName(arguments) or objectName.methodName(arguments)
- General use for java static methods is to access static fields.
- Static methods can be accessed by java instance methods.
- Java static methods cannot access instance variables or instance methods directly.
- Java static methods cannot use the ‘this’ keyword.
Java Static Classes
- For java classes, only an inner class can be declared using the static modifier.
- For java a static inner class it does not mean that, all their members are static. These are called nested static classes in java.
[...] coming to the static import part. Like the above ugly line we have been unknowingly using (abusing) the java static [...]
What is a static import i&hellip on November 17th, 2009 11:34 pmGood, concise answer.
But, I would want one more thing to be added to it:
Static methods can’t be overridden, which implies they are final methods. Rather, the concept of overridden itself should never arise because static methods are part of a class and not of an object.
But, because of the notation we abuse by writing obj.staticMethod(), people generally get confused.
Thanks,
Aatish on December 7th, 2009 5:14 amhi…!
If you would use static methods and fields only, you would end up programming procedural like you would do with C or Pascal, loosing all the benefits of oop..so static method is used only when required and instance method is used elsewhere to get the benefit of oop.
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[...] Instance Variable Java variables that are declared without static keyword are instance [...]
How many types of java va&hellip on January 22nd, 2011 5:34 pm[...] As given in the last line, method area is part of non-heap memory. It stores per-class structures, code for methods and constructors. Per-class structure means runtime constants and static fields. [...]
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[...] initialization block. That too you have seen in it a class for initialization. You may have used a static initialization block. When you use the initialization block for an anonymous inner class it becomes [...]
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Ronak on May 24th, 2011 10:42 amit is not clearly, please provide full information with example
raghavareddy on June 2nd, 2011 5:45 am[...] To specifically denote that the instance variable is used instead of static or local variable.That [...]
Java this Keyword&hellip on June 10th, 2011 9:21 am@Anonymous:i cannot understand your point ll u please explain it
thanks
no access modifier – Subclasses in other package wont allow.
But in protected will can be accessed subclasses in another pacakge.
Muhammad Waqas on December 8th, 2011 7:08 pmAnonymous on October 14th, 2010 12:47 pm
By last point in java Instance Variables
When the ” value of a constant is known at compile time ” it is declared ‘final’ using the ‘static’ keyword.
i would like to ask one thing according to double quotes
there are how many to give a value to a variable or a Constant
1. Compile time
2….
3…
there are how many possible ways?
Muhammad Waqas on December 8th, 2011 7:22 pmthanks
what are static fields
Muhammad Waqas on December 8th, 2011 7:26 pmwhat about this
Class A{//something here}
public Class B{
static A obj= new A(); // a static object to //class
****
harry on February 6th, 2012 12:11 pmcan you explain this how this works?