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components of Java Development Kit (JDK):

The Java Development Kit comes with a collection of tools that are used for developing and running Java programs. They include:

appletviewer (for viewing Java applets)

javac (Java compiler)

Java (Java interpreter)

javap (Java disassemble)

javah (for C header files)

javadoc (for creating HTML documents)

jdb (Java debugger)

The following table describes the tools used in java environment


it enables us to run java applets (without actually using a java-compatible browser).


java interpreter, which runs applets and applications by reading and interpreting bytecode files.


the java compiler, which translates java sourcecode to bytecode files that the interpreter can understand


creates html-format documentation from java source code files,


produces header files for use with native methods.


java disassembler, which enables us to convert bytecode files into a program description,


java debugger, which helps us to find errors in our programs.

The way these tools are applied to build and run application programs is illustrated in the figure below. To create a Java program, we need to create a source code file using a text editor. The source code is then compiled using the Java compiler javac and executed using the Java interpreter Java, The Java debugger jdb is used to find errors, if any, in the source code. A compiled Java program can be converted into a source code with the help of Java disassembler javap.

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