Java Core Interview Questions and Answers. Tech interviewer’s notes

Static keyword can be used with class, variable, method and block. Static members belong to the class instead of a specific instance, this means if you make a member static, you can access it without object.

Static block is used for initializing static variables. This block gets executed when the class is loaded in the memory. A class can have multiple static blocks, which will execute in the same sequence they have been written in the class.

class JavaExample{

static int number;

static String myString;

static {

number = 123;

myString = Java;

}

public static void main(String args[]){

System.out.println(Value of number: + number);

System.out.println(Value of myString: + myString);

}

}

A static variable is common to all the instances of the class because it is a class level variable. Only a single copy of static variable is created and shared among all the instances of the class. Memory allocation for such variables only happens once when the class is loaded in the