Java Package A java package is a group of similar types of classes, interfaces and sub-packages. Package in java can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc. Here, we will have the detailed learning of… Read More »
In this page, we will learn about Java objects and classes. In object-oriented programming technique, we design a program using objects and classes. An object in Java is the physical as well as a logical entity, whereas, a class in Java is a logical entity only. What is an object in Java An entity that… Read More »
Java naming convention is a rule to follow as you decide what to name your identifiers such as class, package, variable, constant, method, etc. But, it is not forced to follow. So, it is known as convention not rule. These conventions are suggested by several Java communities such as Sun Micro systems and Netscape. All… Read More »
Java compiler executes the code from top to bottom. The statements in the code are executed according to the order in which they appear. However, Java provides statements that can be used to control the flow of Java code. Such statements are called control flow statements. It is one of the fundamental features of Java,… Read More »
Java keywords are also known as reserved words. Keywords are particular words that act as a key to a code. These are predefined words by Java so they cannot be used as a variable or object name or class name. List of Java Keywords A list of Java keywords or reserved words are given below:… Read More »
Operator in Java is a symbol that is used to perform operations. For example: +, -, *, / etc. There are many types of operators in Java which are given below: Unary Operator, Arithmetic Operator, Shift Operator, Relational Operator, Bitwise Operator, Logical Operator, Ternary Operator and Assignment Operator. Java Operator Precedence Operator Type Category Precedence Unary postfix expr++… Read More »
Unicode is a universal international standard character encoding that is capable of representing most of the world’s written languages. Why java uses Unicode System? Before Unicode, there were many language standards: ASCII (American Standard Code for Information Interchange) for the United States.ISO 8859-1 for Western European Language.KOI-8 for Russian.GB18030 and BIG-5 for chinese, and so on. Problem This caused… Read More »
JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed. JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent). What is JVM It is: A specification where working of Java Virtual Machine is specified. But implementation provider is… Read More »
We must understand the differences between JDK, JRE, and JVM before proceeding further to Java. See the brief overview of JVM here. If you want to get the detailed knowledge of Java Virtual Machine, move to the next page. Firstly, let’s see the differences between the JDK, JRE, and JVM. JVM JVM (Java Virtual Machine) is… Read More »
In the previous section, we have created Java Hello World program and learn how to compile and run a Java program. In this section, we are going to learn, what happens while we compile and run the Java program. Moreover, we will see some questions based on the first program. What happens at compile time?… Read More »