Jdk...............

[sriya]

hi there..

i'm just new for the 'java environment' & have studied with basic applications on java.
i'm just struggling with the word 'JDK' & just want to clarify,
1) the real meaning of the 'Java Development Kit' (JDK)
2) what does it contain (the components)?
3) are the 'java vitual machine' (JVM) & the 'java compiler' parts of JDK?
&
4) the meaning of JDK 1.2, which's most widely talked version.

although, i've gone through some documentations regarding JDK, i've not got the real sence of it.
& i've seen the definition for JDK as....
"A software package that can be used to write, compile, debug, and run Java applets and applications." in 'google'.

5) is this correct ? & if not what's the real definition?
6) is it essential to have this JDK to compile & run java programs on our PCs.


Could anyone of you please help me to clarify these doubts?
thanks in advance.

[manavo11]

1) Yep
2) Contains all the classes you need to create Java applications
3) The compiler creates the ".class" files from all the ".java" files you create. The virtual machine basically runs/executes the .class files.
4) There are different versions of the JDK. 1.2 is one version, 1.4.2 is another, 1.5 is another...
5) Yes it's correct
6) Since the JDK has the compiler and the virtual machine, without the JDK you can't compile your programs or execute your compiled programs...

[CornedBee]

2) It contains a complete JRE (Java Runtime Environment, the software package that non-developers need - it contains the virtual machine and the runtime library). In addition, it contains development tools: the Java compiler, the JAR packager, the JAR signing tools, the command line debugger, and a few others. The Sun JDK also comes with the source code for nearly the complete runtime library.
3) It's "virtual", but yes.
4) JDK 1.2 is so common because it was the first version to support Swing, and thus until recently it was the minimum requirement of most Java apps. However, currently the most common minimum version seems to be 1.3, with 1.4 catching up. And of course Java5 offers many great new features, so many new apps require that.
6) You need the JDK to compile programs, but the JRE suffices to run them.

[vinod_kumar]

Hi
I am Lakshmi Narayana
I am new to Java
I got one Question. Can Applets be used in Web Applications (on the Server Side)?

[ComputerJy]

Hi
I am Lakshmi Narayana
I am new to Java
I got one Question. Can Applets be used in Web Applications (on the Server Side)?

First of all, welcome to the forums.
The answer is yes, you can add applets to JSP apps.

[sriya]

thankx everybody.
i think i got ur point. if the following is my definition for JDK,,, i hope it's correct

"JDK is the collection of tools including Java Virual Machine, Java Compiler and other Java Libraries & Packages which enable to perform both Compiling & Executing java programs" & whenever we need to compile & run a java application we need to have installed the JDK in the machine .............

comment on please ...

[ComputerJy]

You need the JDK to compile Java, you need JRE (Java Run-time Environment)to run java

[jlbovo]

hello, i am new to jave too. I am taking a user interface desing class, we do everything in Java. I am eager to learn..and I'm glad i stumbled across this post. Now I have a little better idea of what I'm doing. Thanks.