beginner's guide for java programming

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beginner's guide for java programming

• Introduction to Java programming
• JAVA was developed in 1991 by Sun Microsystems
  Inc and later acquired by Oracle Corporation. It
  was developed by James Gosling and Patrick
  Naughton. It is a simple programming language.
  Writing, compiling and debugging a program is
  easy in java. It helps to create modular programs
  and reusable code.
• Java Virtual machine (JVM)
• This is generally referred to as JVM. Before
  that, we discuss the phases of program execution
  via JVM. The phases are as follows we write the
  program, then we compile the program, and finally
  we run the program.
• the writing of the program is of course done by
  java programmers like you and me.
• the program is compiled by javac compiler, javac
  is the primary java compiler included in the
  java development kit (JDK). It takes java program
  as input and generates java bytecode as output.
• in the third phase, JVM executes the byte code
  generated by the compiler. This is called
  program run phase.
• Bytecode
• As mentioned above, javac compiler from JDK
  compiles the java source code into bytecode so
  that it can be executed by JVM. The byte code is
  stored in A.Class file after compiler.
• Java Development Kit (JDK)
• While I explain JVM and bytecode, I used the term
  JDK. Let's discuss it. As the name implies, this
  is a Complete java development kit that includes
  JRE (Java Runtime Environment), Compiler and
  various tools such as JavaDoc, Java debugger,
  etc.
• To create, compile and run Java program, you need
  JDK installed on your computer.

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Java Runtime Environment (JRE) JRE is part of
JDK, which means that JDK JRE. If you have JRE
installed on your system, you can run a java
program, but you cannot compile it. JRE includes
JVM, browser plugins, and applets support. If you
only need to run a java program on your
computer, you only need the JRE.
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Main features of JAVA Java is a
platform-independent language Java is an
object-oriented language Simply Robust Language
Java is distributed Java is Safe Multithreading
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Portable
How do I declare a variable in Java To declare a
variable, follow this syntax variable_name
data_type value here, the value is optional
because in java you can declare the variable
first and then later assign it to the
value. Types of variables in Java There are
three types of variables in Java. 1) Local
variable 2) Static (or class) variable 3)
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