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What else can I help you with?
Tell about static method?
in java a method is said to be static if 'static 'keyword is used before the method name . foe ex.- static void show(){ ........ } this method has the following property-- 1. it can invoke only a static method. 2. it can't be reffered using keyword 'this','super'. 3.static method can access only a STATIC MEMBER VARIABLE or STATIC CLASS VARIABLE . 4. there should not be static & non static version of a nethod in a class . 5.static method can be used before the creation of d object of dt class.
What is static java most commonly used for?
Static java method is the same as a static variable. They belong to a class and not an object of that class. If a method needs to be in a class, but not tied to an object, then one uses static java.
What is the scope of any variable?
The Scope of a variable defines the areas of a program where this variable would be visible and can be used. For ex: a. Method variables - are visible only inside the method where they are declared and hence their scope is only the method b. Class variables - are visible inside the class and can be used by any method inside the class and hence their scope is the whole class.
What is difference between Static and Global variable?
Static may be local of global -local static variable is limited to the function scope. and retain it's value when function is been called . compiler differentiate static variables with a prefix function name while dealing with same name static variable in different functions. - Global static variable is visible to all the function defined in the file and retain it value but it cannot be used outside this file. now Global Variable --- this variable is also visible to all of the functions inside the file but also can be used outside the file via extern keyword.
What are static objects in java?
There is no separate entity as a static object in java. The static keyword in java is used to signify that the member (either a variable or a method) is not associated to an object instance of the class. It signifies the fact that the member belongs to the class as a whole. The words static and objects are opposites of one another so you cannot have a static object. However, you can declare an object as a class level variable which could be referred to as a static object but it will be referred to as a static or class variable and not a static object.
What is a Singleton class How do you write it?
"A class containing a static variable that stores a unique, and inaccesibleto external classes (private), intance of itself. The static variable isaccessed by a static method, with public access, usually called getIntance.The static variable is initiated by the static getInstance method thatvalidates wether or not the static variable already exits. If the staticvariable has not being initiated, a new instance of the class is createdand assigned to the static variable which reference is then returned by themethod. If the static variable was previously created, the method willreturn a reference to the static variable." 1A Singleton class is used when you wish to restrict instantiation of a class to only one object."Simple Singleton Pattern Example in AS3class Data{private static var dataInstance:Data;public static function getInstance():Data{if(!dataInstance) dataInstance = new Data();return dataInstance;}public function Data(){if(dataInstance) throw Error("instance exists, please use Data.getInstance()");}}" 21 [Daniel Guzman - AS3 Object Oriented Programming]2 [Daniel Guzman - AS3 Object Oriented Programming]
What is static variable and how it is declared?
static variables are declared to define a variable as a constant., means if you declare a variable as static the variable becomes costant.syntaxstatic int a=100;this will make the value of a as 100 which is not to be changedWell, no; you think of 'const', which can be used together with static, but not necessarily.Yes you are right bro I was confused it should be const int a=100; then the variable will be a constant.
What is singleton class it's implementation?
"A class containing a static variable that stores a unique, and inaccesibleto external classes (private), intance of itself. The static variable isaccessed by a static method, with public access, usually called getIntance.The static variable is initiated by the static getInstance method thatvalidates wether or not the static variable already exits. If the staticvariable has not being initiated, a new instance of the class is createdand assigned to the static variable which reference is then returned by themethod. If the static variable was previously created, the method willreturn a reference to the static variable." 1A Singleton class is used when you wish to restrict instantiation of a class to only one object."Simple Singleton Pattern Example in AS3class Data{private static var dataInstance:Data;public static function getInstance():Data{if(!dataInstance) dataInstance = new Data();return dataInstance;}public function Data(){if(dataInstance) throw Error("instance exists, please use Data.getInstance()");}}" 21 [Daniel Guzman - AS3 Object Oriented Programming]2 [Daniel Guzman - AS3 Object Oriented Programming]
Can this pointer be used within the concept of the static method?
No. When a method is declared static, it is defined outside of any individual class reference.
Why you use main method when you can use static method?
The main method is called by the jvm when your program is executed. The main method is a static method: public static void main(String[] args) {} A static method is method that can be run without instantiate the class (creating an object from it) The main method is a static method. No other static method could replace it's functionality. PS By static method do you mean static initialiser? I often use static initialisers instead of a main method, but in these cases you must still have a main method, albeit an empty one ie. public static void main(String[] args) {} Notice that the method has an empty body A main method must be used if you intend to accept parameters at run time from the jvm.
Static keyword in java?
A Static method in Java is one that belongs to a class rather than an object of a class. Normal methods of a class can be invoked only by using an object of the class but a Static method can be invoked Directly. Example: public class A { ..... public static int getAge(){ .... } } public class B { ..... int age = A.getAge(); } In class B when we wanted the age value we directly called the method using the instance of the class instead of instantiating an object of the class. Tip: A static method can access only static variables. The reason is obvious. Something that is common to a class cannot refer to things that are specific to an object...
A variable declared inside the for loop control cannot be referenced outside the loop?
Yes. A variable declared inside the loop is a local variable for the code block enclosed by the {} statements of the for loop. The variable will not be available to be used by any code outside the code block.
