Java Developer

byte: The byte data type is an 8-bit signed two's complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive). The byte data type can be useful for saving memory in large arrays, where the memory savings actually matters.

short: The short data type is a 16-bit signed two's complement integer. It has a minimum value of -32,768 and a maximum value of 32,767 (inclusive). 

int: By default, the int data type is a 32-bit signed two's complement integer, which has a minimum value of -231 and a maximum value of 231-1. 

long: The long data type is a 64-bit two's complement integer. The signed long has a minimum value of -263 and a maximum value of 263-1. 

float: The float data type is a single-precision 32-bit IEEE 754 floating point.

double: The double data type is a double-precision 64-bit IEEE 754 floating point. 

boolean: The boolean data type has only two possible values: true and false. Use this data type for simple flags that track true/false conditions. 

char: The char data type is a single 16-bit Unicode character. It has a minimum value of '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive).

It is :
A specification where working of Java Virtual Machine is specified. But implementation provider is independent to choose the algorithm. Its implementation has been provided by Oracle and other companies.
An implementation Its implementation is known as JRE (Java Runtime Environment).
Runtime Instance Whenever you write java command on the command prompt to run the java class, an instance of JVM is created.

Java is object oriented programming language because without class and object it is impossible to write any Java program.
Java is not pure object oriented programming language because java has predefined primitive data types (which are not objects) and you can access the members of a static class without creating an object of it.

Just-in-time, or JIT, is an inventory management method in which goods are received from suppliers only as they are needed. The main objective of this method is to reduce inventory holding costs and increase inventory turnover. Just in time requires carefully planning the entire supply chain and usage of superior software in order to carry out the entire process till delivery, which increases efficiency and eliminates the scope for error as each process is monitored.