Install the software and set the path :-
·
Download the software
from internet based on your operating system.
·
The software is
different from 32-bit operating and 64-bit operating system.
·
To download the
software open the fallowing web site.
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
For 32-bit operating system please click onJDK Folder Hierarchy
How to Set Path and Classpath in Java
Java
Classpath Setting
Path Variable
·
Path variable is set for providing
path for all java tools like java, javac,javap, javah,
jar, appletviewer which are use in java programming. These all tools are
available in bin folders so we set path upto bin folders.
Classpath Variable
·
Classpath
variable is set for providing path for predefined java classes which is used in
our application. All classes are available in lib/rt.jar so we
set classpath upto lib/rt.jar.
Why
set path ?
·
The following programming error is
general for all java programmers when they compile any java program.
·
'javac' is not recognized as an
internal or external command, operable program or batch file.
·
When you get this type of error,
then your operating system cannot find the java compiler (javac).
To solve this error you need to set the PATH variable.
·
Javac
is a tool which is available in bin folder so you must set the PATH upto bin
folder. In a bin folder all tools are available like javap,
javah, jar, javac, java, appletviewer etc. These all tools are used
for different-different purpose.
set
the path and classpath
·
Go on my computer icon and right click, after that
click on properties option.
·
Now click on advance setting
·
Click on advance
·
Click on Advance variables
·
Click on new button which is below the first box.
·
Now one dialog box is appear, now ignore this but do
not close.
·
Now open my computer open c:/ > Programs Files
> java > java1.6.0 > bin copy this path
·
Now come back on previous open dialogbox and write
variable name 'path' and for variable value paste all copied
path up to bin folder. Put.;at the end. It (.) select all the tools from bin folder.
·
Now open my computer open c:/ > Programs Files > java >
java1.6.0 >jre > lib > rt.jar copy this path
·
Note:rt.jar is available in lib folder this jar files contains
all classes of jdk.
·
Now again come back on Environment variable dialogbox
and click on new. Now one box is open and write path variable as 'classpath'
and for variable value paste all copied path up to rt.jar. Put dot (.)At the
end. It (.) select all the classes from lib folder.
·
Note: Finally after set classpath Restart your
system, or you can re-open command prompt.
· Difference between path and classpath in Java
Path
·
Path
variable is set for provide path for all java tools like java, javac, javap,
javah, jar, appletviewer which are use at the time of java programming like for
run java any program we use java tool and for compile java code use javac tool.
These all tools are available in bin folder so we set path upto bin folder.
classpath
·
classpath
variable is set for provide path of all java classes which is used in our
application. All classes are available in lib/rt.jar so we set
classpath upto lib/rt.jar.
Difference between path and classPath
|
path |
classpath |
|
path variable is set for provide path
for all java tools like java, javac, javap, javah, jar, appletviewer |
classpath variable is set for provide
path of all java classes which is used in our application. |
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