Timothy C. Needham

“What does the source code really look like? Code doesn’t typically follow the rules of natural languages, such as English. Take a look at this small program to understand what I mean:”
― Timothy C. Needham, Learn Java: A Crash Course Guide to Learn Java in 1 Week:

“Make oracle Java JRE/JDK the default Java  If you are dealing with JDK, just type the code below and press enter: Do the same (type the code below) for JDK and tap Enter: Type the code below as well and tap Enter: For oracle JRE (32 or 64 bit) For the installation of JRE, type the code below and tap Enter: For the installation of JDK, type the code below and tap Enter: Reload the system path file/etc/profile Type the following and tap enter: You need to note that the system-wide path file will reload once you reboot your Linux system. Test a successful installation Open your terminal, type and tap enter: java –version You get the something like this if your installation of 32 bit Java is successful. If you are using a 64-bit java, you’ll get something like this: If the tests mentioned above work as depicted above, you can be sure that your Java is successfully installed on your system. 2: Windows The process of downloading and installing Java in Windows is even easier than in Linux. Let’s go through the steps: Click this link to download the latest version of Java JDK. Now accept the license agreement and download the latest JDK according to your version (that is 64 or 32 bit) of Java for windows. When your download is complete, run the exe file to install JDK, and click next. Click close when the installation completes. Set Java environment variables: classpath and path The path variable offers the location of executables such as java, javac and so forth. You can be able to run a program without specifying the PATH but you’ll require a full path of executable such as C:\Program Files\Java\jdk1.8.0_131\bin\javac as opposed to the simple javac A.Java The variable ‘CLASSPATH’ provides the library files’ location. We’ll now look at the steps to set the CLASSPATH and PATH. Right click on ‘My Computer’ and then select ‘properties’ Select ‘advanced system settings’ and then ‘environment variables’.”
― Timothy C. Needham, Programming: 4 Manuscripts in 1 book : Python For Beginners - Python 3 Guide - Learn Java - Excel 2016