First Java Class

class-based object-oriented programming language and case-sensitive language.

Compiler:

A compiler is a special program that translates a programming language’s source code into machine code, bytecode or another programming language. The source code is typically written in a high-level, human-readable language such as Java or C++.

Java Open Source

Java Development Kit – JDK

It is responsible for Error handling Compiler etc.

Java Platform, Standard Edition (Java SE) lets you develop and deploy Java applications on desktops and servers. Java offers the rich user interface, performance, versatility, portability, and security that today’s applications require.

Program

class First
{
public static void main(String[] args)
{
System.out.println(“Welcome to Java”);

}
}

After write the java program

compilation: javac First.java

java First

output: Welcome to Java

Reference

compiler: https://www.techtarget.com/whatis/definition/compiler

Java JDK: https://www.techspot.com/downloads/5553-java-jdk.html