WHAT IS STATIC VARIABLE IN JAVA 2023
WHAT IS STATIC VARIABLE IN JAVA 2023that belongs to a class and is initialized only once at the beginning of execution.
static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023:
A static variable is a variable that belongs to a class and not to an object (instance).
A static variable can be accessed directly using the class name and does not need an object for it.
A single copy that will be shared by all instances of a class, i.e. all classes can share a static variable throughout the program.
Static variables can be initialized only once, at the beginning of program execution. We need to initialize the static variable first, before initializing any instance variables.
Static variables are
Syntax: <class-name>.<variable-name>
Static variable syntax
static data_type variable_name;
static int a;
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WHAT IS A STATIC METHOD IN JAVA?
This is a method in Java that belongs to a class and not an object. A static method can only access static data.
This is a method that belongs to a class and not an object (instance)
A static method can only call other static methods and cannot call a non-static method from it.
A static method can only access static data. Cannot access non-static data (instance variables)
A static method can be accessed directly by class name and does not need an object
A static method cannot refer to the “this” or “super” keywords in any way.
Syntax :<class-name>.<method-name>
Let’s learn the practical aspect of the static keyword
Example: How to call static variables and methods
Copy the following code into the editor and save, compile and run the code.
INITIALIZE A STATIC VARIABLE
Static variables are automatically initialized when the class is loaded.
Static variables are initialized before any static methods of the class are executed.
Static variables are initialized before any object of that class is created.
The default values for static and non-static variables are the same.
Static final variables are constants. Let’s look at the code below:
public class MyFirstClass
public static final int MY_FIRSTVAR=27;
1) The variable MY_FIRSTVAR is public, which means it can be used by any class in the program. It’s a static variable, so we won’t need any class object to access it. It is final, so the value of this variable can never be changed either in the current class or in any other class.
2) The above code will be executed as soon as MyFirstClass is loaded, before any static method is called and before any static variable can be accessed.
Java static keyword – let’s explore
Java is a general-purpose, object-oriented programming language. The latest version is Java 9, released on September 21, 2017, it has various features. Today we will discuss about static keywords, Codec Networks provides best Java training and certification in Delhi.
Static in Java: Overview of static keywords with examples
Author: Ravikiran A S
Last updated on January 27, 202343143
The static keyword in Java
Content
Static keyword in JavaStatic variables in JavaStatic Methods in JavaStatic vs non-static static blocks in JavaView more
There are many reserved keywords in Java that cannot be used as variable names or identifiers. One such frequently used keyword in Java is the “Static” keyword.
The most important reason why the static keyword is heavily used in Java is for efficient memory management. In general, if you want to access variables or methods inside a class, you must first create an instance or object of that class. h
owever, there may be situations where you only want access to a few methods or variables of a class and you don’t want to create a new instance of that class just to access those members. Here you can use static keyword in java.
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In Java, it is possible to use the static keyword with methods, blocks, variables, but also nested classes.
Simply put, if you use the static keyword with a variable or method inside a class, then for every instance you create of that class, those static members remain constant and you can’t change or modify them.
In fact, you can access these members without instantiating an object for these classes. You can access them simply by using the class name. In fact, the main method of a class in Java is usually associated with the static keyword. But yes, it depends on the developer’s choice.
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The static keyword in Java
The Java static keyword in Java indicates that a particular member is not an instance, but rather part of a type. A static member will be shared between all instances of the class, static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023. so we only create one instance of it.
If any member in a class is declared static, it means that all static members can be accessed and made active before the class is initialized. In contrast, non-static members of the same class cease to exist if no object exists or the object goes out of scope
static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023..
On a side note, if you consider the methods inside the “Math” class in Java, you will find that most of its methods are static. You can simply access them using the class name. For example, “Math.abs()”, “Math.pow()”, “Math.PI”, etc.
static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023. In this detailed and comprehensive guide to the static keyword in Java, you’ll look at all 4 members you can use the static keyword on, with practical hands-on examples on each. So without further ado let’s dive deep into the tutorial.
A static variable is common to all instances (or objects) of a class because it is a class-level variable. In other words, you can say that only one copy of the static variable is created and shared among all instances of the class. Memory allocation for such variables occurs only once when the class is loaded into memory.
Like variables we can have static block, static method and static class which you can read about: static keyword in Java .
Static WHAT IS STATIC VARIABLE IN JAVA variable syntax
static keyword followed by the data type followed by the variable name.
static data_type variable_name static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023.;
As I mentioned above that static variables are shared between all instances of a class, they are useful when we need to manage memory WHAT IS STATIC VARIABLE IN JAVA . In some cases, we want to have a common value for all instances, like a global variable, then it is much better to declare them as static, as this can save memory (since only one copy is created for static variables).
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Initializing a static variable
Static variables are initialized when the class is loaded.
Static variables are initialized before any object of that class is created.
Static variables are initialized before any static methods of the class are executed.
The default values for static and non-static variables are the same static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023..
primitive integers (long, short, etc.): 0
primitive float (float, double): 0.0
boolean: false
object references: null
Static final variables
Static final variables are constants. Let’s take a look at the code below:
public class MyClass{
public static final int MY_VAR=27;
}
Note: Constant variable name should be in capital letters! you can use an underscore (_) between.
1) The above code is executed as soon as MyClass is loaded, before any static method is called and before any static variable can be accessed.
2) The MY_VAR variable is public, which means any class can use it. It’s a static variable, so you won’t need any class object to access it. It is final, so the value of this variable can never be changed in the current or in any class.
Key points:
a final variable always needs initialization, if you don’t initialize it, it will throw a compile error. look at the example below –
Class variables, also known as static variables, are declared using the static keyword in a class, but outside a method, constructor, or block static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023..
There would only be one copy of each class variable per class, regardless of how many objects are created from it WHAT IS STATIC VARIABLE IN JAVA .
Static variables are rarely used other than declared as constants. Constants are variables that are declared as public/private, final, and static. Constant variables never change from their initial value WHAT IS STATIC VARIABLE IN JAVA .
Static variables are stored in static memory. It is rare to use static variables other than declared final and used as public or private constants WHAT IS STATIC VARIABLE IN JAVA .
Static variables are created when the program starts and destroyed when the program stops.
Visibility is similar to instance variables. However, most static variables are declared public because they must be available to users of that class static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023..
Default values are the same as instance variables WHAT IS STATIC VARIABLE IN JAVA . For numbers, the default value is 0; it is false for Booleans; and is null for object references. Values can be assigned during declaration or in the constructor. Additionally, values can be assigned in special static initialization blocks static keyword followed by the data type followed by the variable name WHAT IS STATIC VARIABLE IN JAVA 2023..
Static variables can be accessed by calling the class name class_name.variable_name.
When you declare class variables as public static final, then the variable (constant) names are all upper case. Unless static variables are public and final, the naming syntax is the same as for instance and local variables.
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