why we use static in java
In Java, static keyword is mainly used for memory management.
It can be used with variables, methods, blocks and nested classes.
It is a keyword which is used to share the same variable or method of a given
class. Basically, static is used for a constant variable or a method
that is same for every instance of a classwhat is static keyword in java
Static keyword is used a lot in java.
Static means, you
can access those static variables
without creating an object,
just by using a class name.
This means that only one instance of
that static member is created which
is shared across all instances of the class.
Basically we use static keyword when
all members share same instance.static in java
static keyword is a non-access modifier. static keyword can be used with
class level variable, block, method and inner class or nested class.static keyword in java
// example on static variable in java.
class EmployeeDetails
{
// instance variable
int empID;
String empName;
// static variable
static String company = "FlowerBrackets";
// EmployeeDetails constructor
EmployeeDetails(int ID, String name)
{
empID = ID;
empName = name;
}
void print()
{
System.out.println(empID + " " + empName + " " + company);
}
}
public class StaticVariableJava
{
public static void main(String[] args)
{
EmployeeDetails obj1 = new EmployeeDetails(230, "Virat");
EmployeeDetails obj2 = new EmployeeDetails(231, "Rohit");
obj1.print();
obj2.print();
}
}static keyword in java
// example on static block in java.
public class StaticBlockExample
{
// static variable
static int a = 10;
static int b;
// static block
static
{
System.out.println("Static block called.");
b = a * 5;
}
public static void main(String[] args)
{
System.out.println("In main method");
System.out.println("Value of a : " + a);
System.out.println("Value of b : " + b);
}
}static keyword in java
// example on static class in java.
import java.util.*;
public class OuterClass
{
// static class
static class NestedClass
{
public void show()
{
System.out.println("in static class");
}
}
public static void main(String args[])
{
OuterClass.NestedClass obj = new OuterClass.NestedClass();
obj.show();
}
}Copyright © 2021 Codeinu
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