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- Written by Nam Ha Minh
- Last Updated on 26 September 2019 | Print Email
Dec 07, 2016 This video demonstrates how to convert.py to.exe so you can run a python script without python on the host computer using pyinstaller. This video will show you how to set up pip, install.
NOTES:This beginner tutorial is targeted for Windows environment.Join GitHub today. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions. JD-GUI is a standalone graphical utility that displays Java source codes of “.class” files. This tutorial helps you use the core tools in JDK (javac, jar and java) to compile, package and run a Java program under the following circumstance: - The Java source file is under a package. There’s an external library. The JAR file is an executable JAR.
1. Download and install Java Development Kit
In order to write and run a Java program, you need to install a software program called Java SE Development Kit (or JDK for short, and SE means Standard Edition). Basically, a JDK contains:- JRE(Java Runtime Environment): is the core of the Java platform that enables running Java programs on your computer. The JRE includes JVM (Java Virtual Machine) that runs Java programs by translating from bytecode to platform-dependent code and executes them (Java programs are compiled into an intermediate form called bytecode), and other core libraries such as collections, File I/O, networking, etc.
- Tools and libraries that support Java development.
- javac.exe: is Java compiler that translates programs written in Java code into bytecode form.
- java.exe: is the Java Virtual Machine launcher that executes bytecode.
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2. Set up environment variables
Now we’re going to set environment variables so that the javac.exeprogram can be accessed anywhere from command line. On Windows 7, go to My Computer and click System Properties:Then click Advanced system settings:The System Properties dialog appears, select Advanced tab and click Environment Variables.:The Environment Variable dialog appears, click on the![Compile java code into dmg mac Compile java code into dmg mac](/uploads/1/3/4/3/134355105/124332134.png)
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How To Compile Java Code
dialog, append the following to the end of the field Variable value:Download all attachments outlook mac. ;%JAVA_HOME%bin
javac -version
3. Code a Java hello world program
Open a simple text editor program such as Notepad and type the following content:Save the file as HelloWorld.java (note that the extension is .java) under a directory, let’s say, C:Java.Don’t worry if you don’t understand everything in this simple Java code. The following picture explains it nicely:Every Java program starts from the main()method. This program simply prints “Hello world” to screen.4. Compile your first Java program
Now let’s compile our first program in the HelloWorld.java file using javac tool. Type the following command to change the current directory to the one where the source file is stored:Atlas copco troubleshooting manual. cd C:Java
javac HelloWorld.java
5. Run your first Java program
It’s now ready to run our first Java program. Type the following command:java HelloWorld
6. What we have learnt so far
Throughout this tutorial you have learnt the following things:- JDK is the Java SE Development Kit that contains tools and libraries for Java development.
- JRE is the Java Runtime Environment that enables running Java programs on your computer.
- JVM is the Java Virtual Machine that actually executes Java programs. With JVM, programs written in Java can run on multi-platforms (thus Java is called cross-platform language).
- How to install JDK and configure environment variables.
- javac is the Java compiler. It translates Java source code into bytecode.
- java is the JVM launcher which we use to run our program.
- Every Java program starts from the main() method.
- When compiling, the compiler generates a .class file from a.java file.