Interview Questions - Core Java

We can not declare top level class as static, but only inner class can be declared static.

public class Test
{ 
    static class InnerClass
    {
        public static void InnerMethod()
        { System.out.println("Static Inner Class!"); }
    } 
    public static void main(String args[])
    {
       Test.InnerClass.InnerMethod();
    }
}
//output: Static Inner Class!

When a method needs to be accessed even before the creation of the object of the class then we should declare the method as static.

A static method should not refer to instance variables without creating an instance and cannot use "this" operator to refer the instance.

Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method. And it will be executed only once.