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#How to run a bluej program through command prompt zip file#
#How to run a bluej program through command prompt portable#
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#How to run a bluej program through command prompt windows#

Step 3: Run the compiled bytecode Xxx.class with the input to produce the desired output, using the Java Runtime by issuing command:

#How to run a bluej program through command prompt portable#

Step 2: Compile the source code Xxx.java into Java portable bytecode Xxx.class using the JDK Compiler by issuing command: Step 1: Write the source code Xxx.java using a programming text editor (such as Sublime Text, Atom, Notepad++, Textpad, gEdit) or an IDE (such as Eclipse or NetBeans). The steps in writing a Java program is illustrated as follows: Basic Syntaxes Steps in Writing a Java Program You may also try the " Exercises on Java Basics". The first few sections are a bit boring, as I have to explain the basic concepts with some details. Learning library could be difficult as it is really huge, evolving and could take on its own life as another programming language. Instead, you can re-use the available code in the library. The Application Program Interface (API) libraries associated with the language: You don’t want to write everything from scratch yourself.

The syntax of the programming language: Not too difficult to learn a small set of keywords and syntaxes.įor examples, JDK 1.8 has 48 keywords C11 has 44, and C++11 has 73.To be proficient in a programming language, you need to master two things: Otherwise, read " Introduction To Java Programming for First-time Programmers". I shall assume that you have written some simple Java programs.

#How to run a bluej program through command prompt windows#

For more informationįor more information, see the Sun Java tutorial's section on jar files and the reference pages for the Unix jar tool or Windows jar tool.This chapter explains the basic syntaxes of the Java programming language. This will work if your system has been configured You can invoke an executable jar file from a GUI by double-clicking on the jar file icon. The most likely error is having something in the wrong directory when you created the jar.

Exception in thread "main" : MyMainClass means that the jar file was not constructed properly.

'java' is not recognized as an internal or external command, operable program or batch file means that you don't have your system configured properly to run Java.

This should work if it doesn't, there are two main possibilities: Jar xf binks.jar Foo.java Executing an executable jar fileĪn executable jar file can be invoked in two ways: from the command line or from a GUI by double cliking it.Īt the DOS or UNIX command prompt, type java -jar myResult.jar.

To see the files stored in binks.jar, use the commandĪnd to extract the file Foo.jav a use the command Given a jar file you can view its directory and extract files using the jar command. Where myResult.jar is the jar file you are trying to create, myManifest is the file you created in step 2, and everything else is the files you want to include. Jar cvfm myResult.jar myManifest *.java *.class

From the command line, execute the command:.

Where MyMainClass is the name of the class containing the main method you want to use.

Using a text editor, create a file (say, myManifest) containing the following lines:.

class files (and anything else you want to include) together in a single directory.

In the next dialog window, choose a directory to put your jar file in, type a name for it where asks for a File Name: (the name should end in.

Make sure include source is checked (necessary for grading purposes).

For the main class:, choose the class in your program that has the main method you want the program to start from (remember, any class may have a main method, so BlueJ doesn't know which one you want).

Open your project in BlueJ, and make sure it runs correctly.

#How to run a bluej program through command prompt download#

However, you can put all the pieces of an applet into a single jar file, and a browser can download and use this file directly, which is much faster. If an applet requires several classes, and maybe a picture or two, your computer has to ask for each part separately. Jar files are especially useful for applets.

Jar files can be created from the command line via the jar command or via most Java IDEs, including BlueJ. In addition to extracing and uncompressing the files for examination, you can also load a jar file into the jvm and even execute a jar file, if you've configured it correctly.

#How to run a bluej program through command prompt zip file#

A Java jar ( Java ARchive) file is like a zip file or a tar file: it holds any number of compressed files. The Java jar ( Java ARchive) file mechanism is a good way of packaging up Java classes for storage and execution.