Compiling Hello.java - My First Java Program

Java Tools Tutorials - Herong's Tutorial Examples

∟Compiling Hello.java - My First Java Program

This section provides a tutorial example on how to compile a Java program using the 'javac' tool without any options.

To test the compiler, I wrote my first Java program with a text editor:

class Hello {
   public static void main(String[] a) {
      System.out.println("Hello world!");
   }
}

Then I saved this program with the file Hello.java in the current directory.

Here is what I did in a command window to compile Hello.java with the 'javac' Java compiler tool. The output of the compilation is a Java class file called Hello.class:

herong> javac Hello.java

herong> dir Hello.*
   416 Hello.class
   116 Hello.java

So the simplest way to use the 'javac' Java compiler is to:

Open a command line window.
Change the current directory to the directory where the Java program is stored.
Run the Java compiler tool with "javac" command,
The compilation output file is a class file, stored in the current directory.

Table of Contents

About This Book

Java Tools Terminology

Java Tools Included in JDK

►javac - The Java Program Compiler

javac - Java Compilation Command and Options

►Compiling Hello.java - My First Java Program

"javac -classpath" - Specifying Class Path

"javac -verbose" - Printing Compilation Details

"javac -sourcepath" - Specifying Source Path

"javac -d" - Specifying Output Directory

Two Types of "import" Statements

"import" Statements Processed by "javac"

"javac -g" - Controlling Debugging Information

"javac --module" - Compiling Entire Module

"javac -X" - Specifying Non-Standard Options

java - The Java Program Launcher

jar - The JAR File Tool

jlink - The JRE Linker

jmod - The JMOD File Tool

jimage - The JIMAGE File Tool

jpackage - Binary Package Builder

javadoc - The Java Document Generator

jdeps - The Java Class Dependency Analyzer

jdeprscan - The Java Deprecated API Scanner

jdb - The Java Debugger

jcmd - The JVM Diagnostic Tool

jconsole - Java Monitoring and Management Console

jstat - JVM Statistics Monitoring Tool

JVM Troubleshooting Tools

jhsdb - The Java HotSpot Debugger

jvisualvm (Java VisualVM) - JVM Visual Tool

jmc - Java Mission Control

javap - The Java Class File Disassembler

keytool - Public Key Certificate Tool

jarsigner - JAR File Signer

jshell - Java Language Shell

jrunscript - Script Code Shell

Miscellaneous Tools

native2ascii - Native-to-ASCII Encoding Converter

JAB (Java Access Bridge) for Windows

Archived Tutorials

References

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