August 14, 2022

List all ports opened in windows (netstat -nb)

Maybe you’re troubleshooting a network connectivity issue for a specific program, and you need to check whether its port access is open. What if you need to confirm that your NAS device can communicate with your Windows 10 PC? Whatever reason you need to look for open ports, this article provides detailed steps to check them on Windows 10 using several available tools, either built-in or free to download and use.

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How to check JDK version that installed on your computer

The Java development kit (JDK) contains tools for Java development, and the Java Runtime Environment (JRE) contains a JVM to convert byte code .class to machine code, and execute it, in short, the JRE runs Java program. We can use javac -version to find out the version of the installed JDK. We can use java -version to find out the version of the installed JRE. The JDK and JRE versions can be different on the same computer. Multiple JDK and JRE versions are allowed on the same computer; it is better to find out which version is configured in the system classpath to run or compile the Java program.

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