How to Write First Java Program |How to Compile and Run Java Program |Java Tutorial For Beginners #4
How to Write First Java Program |How to Compile and Run Java Program |Java Tutorial For Beginners #4
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Topic Covered :
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Software required to write java Program :
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Java Software (Install jdk8 or jdk11 on your machine)
Text Editor - (Notepad, Notepad++) OR IDE - (Eclipse, NetBeans, IntelliJ IDEA, etc)
Steps to design First Java Program :
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write the program (Notepad++)
save the program (with .java extension)
compilation process (use javac compiler to compile code) - .class file(bytecode)
execution process (use java to execute program)
Class contains :
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variables
methods
constructors
block(instance & static blocks)
Naming Convention Java :
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Pascal naming Convention :
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starts with upper case & every inner word starts with upper case.
class and interface uses Pascal naming Convention.
eg - class HelloWorld
Camel Case naming Convention: methods(functions),variable :
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starts with lower case & every inner word starts with upper case.
variables and methods name uses camel case convention.
eg. int mobileNumber;
void calculate()
Program :
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class Demo {
public static void main(String arr[]) {
System.out.println("Hello Java");
}
}
Source Code - Demo.java
Compilation - javac Demo.java - Demo.class (bytecode)- bytecode is compiled code in java.
Execution - java Demo
output - Hello Java
JVM is responsible to execute our program.
In this program we have used two predefined classes - System, String
& these classes present in java.lang package
If we are using these classes then we should import java.lang package.
java.lang - Default package in java
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Important Playlist:
🆓 Software Installation For Developer : • Software Installation for Developer
🆓 JDBC Complete Tutorial : • JDBC Tutorial(Java Database Connectivity)
🆓 Core Java Tutorial : • Core Java Tutorials For Beginners
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