what is static keyword in java

Static keyword is used a lot in java. We use static keyword
mainly for memory management. In Java Static means, you
can access them without creating an object, just by using a
class name.
The best-known static method is main, which is called
by the Java runtime to start an application. The main
method must be static, which means that applications
run in a static context by default.

// 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);
   }
}

// 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();
   }
}

// 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();
   }
}

// example on static method in java.
public class StaticMethodExample
{
   static void print()
   {
      System.out.println("in static method.");
   }
   public static void main(String[] args)
   {
      StaticMethodExample.print();
   }
}