DATA TYPES & LITERALS DATA TYPES: Every variable in java should have some type. Every expression should have some type and every type is strictly defined. Every Assignment should be checked by the compiler for type compatibility Hence java language is considered as strongly typed programming language Java is a not pure object oriented programming language. Because several OOPs features not supported by java. Like multiple inheritances, operator overloading, etc. Moreover we are using primitive datatypes in java which are not objects Primitive Data types: Primitive Datatypes (8) Numeric...
JVM ARCHITECTURE JVM--Java Virtual machine 1. what is virtual machine? Virtual means physically doesn't existence. it is a software simulation of a machine. which can perform operations like a physical machine. which is not having physical existence. 2. Types of Virtual Machines?what is the purpose of each machine? all virtual machines are categorized into two categories i. hardware based VM/System Based VM ii. application based VM/process based VM/Software Based VM i. Hardware based VM: KVM[kernal based virtual machine], VM Ware[virtual machine Ware], cloud computing,Xen Ex: Linux os on the same physical machine we can create several logical machines with strong isolation from each other. adv: effective utilization of resources. this type of Hardware based VM associated with Admin roles. Programmers never associated wi...
EVERYTHING ABOUT INTERNET 1.Internet: It is a global network connecting millions of computers. More than 190 countries are linked into exchanges of data, news, and opinions. According to Internet Live stats as of DEC 30 2014 there are 3,037,608,300 Internet users worldwide We generally connect internet through Internet Service Provider [ISP]. Who Owns the Internet? No single person or organization controls the Internet in its entirely. The Internet is more of a concept than an actual tangible entity, and it relies on a physical infrastructure that connects networks to other networks. Is Web and Internet the Same? The Internet is not synonymous with World Wide Web . The Internet is a massive network of networks, a networking infrastructure. It connects millions of computers together globally, forming a ...
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