Compiling multiple source files and specifying classpath using javac

By: Baski Emailed: 1696 times Printed: 2202 times    

Latest comments
By: rohit kumar - how this program is work
By: Kirti - Hi..thx for the hadoop in
By: Spijker - I have altered the code a
By: ali mohammed - why we use the java in ne
By: ali mohammed - why we use the java in ne
By: mizhelle - when I exported the data
By: raul - no output as well, i'm ge
By: Rajesh - thanx very much...
By: Suindu De - Suppose we are executing

Assuming you have a folder named greetings and you have copied all your java source files in that folder, you can compile all of these files with a single command rather than compiling each of them separtely.

This example compiles all the source files in the package greetings.

C:> dir
greetings\
C:> dir greetings
Aloha.java         GutenTag.java      Hello.java         Hi.java
C:> javac greetings\*.java
C:> dir greetings
Aloha.class         GutenTag.class      Hello.class         Hi.class
Aloha.java          GutenTag.java       Hello.java          Hi.java

	

Specifying CLASSPATH while compiling using javac

Having changed one of the source files in the previous example, we recompile it:

C:> cd
\examples
C:> javac greetings\Hi.java
	

Since greetings.Hi refers to other classes in the greetings package, the compiler needs to find these other classes. The example above works, because our default user class path happens to be the directory containing the package directory. But suppose we want to recompile this file and not worry about which directory we're in? Then we need to add \examples to the user class path. We can do this by setting CLASSPATH, but here we'll use the -classpath option.

C:>javac -classpath \examples \examples\greetings\Hi.java
	

If we change greetings.Hi again, to use a banner utility, that utility also needs to be accessible through the user class path.

C:>javac -classpath \examples;\lib\Banners.jar \
	    \examples\greetings\Hi.java
	

To execute a class in greetings, we need access both to greetings and to the classes it uses.

C:>java -classpath \examples;\lib\Banners.jar greetings.Hi

Java Home | All Java Tutorials | Latest Java Tutorials

Sponsored Links

If this tutorial doesn't answer your question, or you have a specific question, just ask an expert here. Post your question to get a direct answer.



Bookmark and Share

Comments(0)


Be the first one to add a comment

Your name (required):


Your email(required, will not be shown to the public):


Your sites URL (optional):


Your comments:



More Tutorials by Baski
Compiling multiple source files and specifying classpath using javac
The equals() Method example in Java
Default Values for Data Types in Java
JSP Example to connect to MS SQL database using Tomcat Connection Pool
<convertNumber> and <convertDateTime> in JSF
Enable/Disable Scripting Elements in JSP
Using calloc() Function in C
lseek() sample program in C
Arrays of Structures example program in C
The Basic Syntax Expression Language in JSP
Initialization of Pointer Arrays in C
Functions returning non-integer values in C
Increment and Decrement Operators in C
Getting Started with C
What is JSF (JavaServer Faces)?

More Tutorials in Java
Update contents of a file within a jar file
Tomcat and httpd configured in port 8080 and 80
Java File
Java String
Count number of vowels, consonants and digits in a String in Java
Reverse a number in Java
Student marks calculation program in Java
Handling Fractions in Java
Calculate gross salary in Java
Calculate average sale of the week in Java
Vector in Java - Sample Program
MultiLevel Inheritance sample in Java
Multiple Inheritance sample in Java
Java program using Method Overriding
Java program to check if user input is an even number

More Latest News
Most Viewed Articles (in Java )
How to Send SMS using Java Program (full code sample included)
Student marks calculation program in Java
XML and Java - Parsing XML using Java Tutorial
append() in Java
How to use ArrayList in Java
Garbage collection and Finalize() method
Using StringTokenizer in Java
Abstract classes in Java
Increment and Decrement Operator
Read from a COM port using Java program
Integer: byte, short, int, and long data types in Java
indexOf( ) and lastIndexOf( ) in Java
Count number of vowels, consonants and digits in a String in Java
Using toLowerCase( ) and toUpperCase( ) in Java
The Basic Structure of a Simple Java program
Most Emailed Articles (in Java)
How to use ArrayList in Java
Write to a COM port using Java program
Read from a COM port using Java program
How to access instance from an inner class and accessing outer class variables in java
Data Types in Java
Tomcat and httpd configured in port 8080 and 80
Save/Write/Read image file from/to a database using Java program
Java program for changeable wrapper class
History of Java
Method Overloading (function overloading) in Java
Sample Java program shows how to write to COM port using Java.
Sample program to demonstrate the use of ActionListener
Introducing JavaScript.
Assigning Object Reference Variables
Bitwise Operator Assignments