Here are some basics about Java and BlueJ:
>>>Java is a high-level language.
>>>Java requires JDK 1.2 or higher version environment to run the program.
>>>BlueJ and Greenfoot are Windows based software which is specially prepared for Java programs to write and to compile.
>>>JDK means Java Development Kit.
>>>BlueJ requires JDK 1.3 for its supplementary.
>>>Java is a simplified version of c and c++.
>>>Java does not support operator overloading.
>>>Java does not support multiple inheritances instead it supports a hierarchy of inheritance.
>>>No header file is used in Java.Instead, it header files, packages are imported into the programs.
>>>Java does not support pointers.
>>>Java files takes .java extension.
>>>When class is saved it takes.CLA extension. this file is run to obtain the output.
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>>>Class is declared by the keyword class.this class is compiled in JDK or BlueJ.
>>>Packages in Java contain various classes to simplify the work and provide various functions.
>>>Comments can be included in the program after //.
>>>Comments and indentation in the programs make them more understandable.
>>>Complexity makes a program bad.A program should have simplicity so that it may be understood very easily.
>>>A program should be written such as it could be modified as and when needed.
>>>A program should not be restricted to be used only on a single computer.It should have portability so that it could be used by the users.
>>>Modular approach of programming concentrates on breaking the program into a number of small programs.
>>>Modular programming does not use GOTO statement for calling modules by a module.
>>>A module is a small program which can be further divided into sub-programs.
>>>In modular programming, programs take more storage space because of a number of modules, but the programs written in such an approach are easily understandable.
>>>A program having syntax error does not compile.
>>>Command to compile a java program is javac.
>>>Command to execute a compiled java program is java.
>>>The removal of errors in a program is called debugging.
>>>Logical errors are the most difficult errors to locate in a program.
>>> // Symbol indicates that whatever follows after it is commented in a single line.
>>>Comments of more than one line can be given by enclosing them by /* and */ symbols.
>>>Blank lines and spaces inserted within a program to enhance readability and clarity are termed as white spaces.
>>>Every Java application has a main method that tells how and in what sequence other methods are used.
>>>Every statement should be terminated with the symbol; in Java.
>>>Main window of BlueJ is called project window.
>>>Main window of BlueJ is called project window.
>>>In BlueJ the objects created are displaced in object bench.
>>>README.TXT file that appears on the class structure overview of BlueJ may be used for documenting the project.
>>>In BlueJ we enter the codes in Editor window.
>>>After entering the codes we need to compile the codes before executing programs.
>>>After executing the main method, the output appears on the Terminal Window of BlueJ.
Hope this may help you in learning some basic information about Java Programming Language.
