Java Development kit(JDK):
JDK is mainly targeted for java
development. I.e. You can create a Java file (with the help of Java packages),
compile a Java file and run a java file.
Java Developer Kit contains tools
needed to develop the Java programs, and JRE to run the programs.
The tools include compiler (javac.exe), Java application launcher (java.exe),
Appletviewer, etc…
Compiler converts java code into
byte code. Java application launcher opens a JRE, loads the
class, and invokes its main method.
You need JDK, if at all you want to
write your own programs, and to compile them.
For running java programs, JRE is
sufficient. JRE is targeted for execution of Java files i.e. JRE = JVM + Java
Packages Classes(like util, math, lang, awt,swing etc)+runtime libraries. JDK
is mainly targeted for java development. I.e. You can create a Java file (with
the help of Java packages), compile a Java file and run a java file.
The Java Development Kit (JDK)
is an Oracle Corporation product aimed at Java developers. Since the
introduction of Java, it has been by far the most widely used Java Software
Development Kit (SDK).
JRE (Java Runtime Environment)
Java Runtime Environment contains JVM, class libraries, and other supporting files. It does not contain any development tools such as compiler, debugger, etc. Actually JVM runs the program, and it uses the class libraries, and other supporting files provided in JRE. If you want to run any java program, you need to have JRE installed in the systemJVM (Java Virtual Machine)
The Java Virtual Machine provides a
platform-independent way of executing code
JVM has to interpret the byte codes
to machine language, then it has to use some native or operating system
specific language to interact with the system. One has to be very clear on
platform independent concept.
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If
you are a Java developer, it is very often that you think about
understanding the JRE,JVM and JDK. Once if you understand these things,
it would be quite easy for you to visualize things in logical manner.
Also look at the picture below, that will clear all your questions about
the JRE,JVM and JDK. This article explains about the each term and will
make you understand perfectly - See more at:
http://www.javabeat.net/2013/02/what-is-the-difference-between-jrejvm-and-jdk/#sthash.Pmr6lNmp.dpuf
If
you are a Java developer, it is very often that you think about
understanding the JRE,JVM and JDK. Once if you understand these things,
it would be quite easy for you to visualize things in logical manner.
Also look at the picture below, that will clear all your questions about
the JRE,JVM and JDK. This article explains about the each term and will
make you understand perfectly - See more at:
http://www.javabeat.net/2013/02/what-is-the-difference-between-jrejvm-and-jdk/#sthash.Pmr6lNmp.dpuf
If
you are a Java developer, it is very often that you think about
understanding the JRE,JVM and JDK. Once if you understand these things,
it would be quite easy for you to visualize things in logical manner.
Also look at the picture below, that will clear all your questions about
the JRE,JVM and JDK. This article explains about the each term and will
make you understand perfectly - See more at:
http://www.javabeat.net/2013/02/what-is-the-difference-between-jrejvm-and-jdk/#sthash.Pmr6lNmp.dpuf
If
you are a Java developer, it is very often that you think about
understanding the JRE,JVM and JDK. Once if you understand these things,
it would be quite easy for you to visualize things in logical manner.
Also look at the picture below, that will clear all your questions about
the JRE,JVM and JDK. This article explains about the each term and will
make you understand perfectly - See more at:
http://www.javabeat.net/2013/02/what-is-the-difference-between-jrejvm-and-jdk/#sthash.Pmr6lNmp.dpuf
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