How to check Java version from cmd?

How to Check Java Version from the Command Line (Cmd)?

Introduction

Java is a popular programming language used by millions of developers around the world. It is widely used for developing desktop applications, mobile applications, web applications, and more. In this article, we will discuss how to check the version of Java installed on your system from the command line (cmd).

Direct Answer: How to Check Java Version from Cmd?

To check the version of Java installed on your system from the command line, you can use the following command:

java -version

This command will display the version of the Java Development Kit (JDK) installed on your system. The output will look something like this:

java version "1.8.0_231"

Java(TM) SE Runtime Environment (build 1.8.0_231-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

This output shows the version of the Java SE Runtime Environment (JRE) and the Java Virtual Machine (JVM) installed on your system.

Additional Information

You can also use the following command to get more information about the Java installation on your system:

java -Xms32m -Xmx512m -showversion

This command will display additional information about the Java installation, including the memory allocation and the Java Runtime Environment (JRE) version. The output will look something like this:

Picked modern VM

Picked  dynamic reconnect

Picked  org.jrollVM.system.jroll.context

CTX: New memory size is 512m 

CTX: gui_CASE insurance is the default false 

CTX: bytes 512, regread 512 initiates disengmatch 

CTX: dismatch memory railed at 12000C

This output provides additional information about the Java installation, including the memory allocation and the JRE version.

Checking the Version of a Specific Java Installation

If you have multiple versions of Java installed on your system, you may need to specify the version of Java you want to check. You can do this by using the following command:

java -version -x <version>

Replace <version> with the version of Java you want to check. For example, to check the version of Java 11, you would use the following command:

java -version -x 11

This command will display the version of Java 11 installed on your system.

Java Executables and Their Functions

Java provides several executables that can be used to interact with the Java virtual machine. Here are some of the most common Java executables and their functions:

Executable	Function
java	Runs Java applications and commands
javac	Compiles Java source code to bytecode
jdb	Debugs Java programs
jconsole	Monitors Java running applications and system properties
keytool	Manages public key pairs and certificates
.policy	Manages Java policy files
serialversionuid	Generates and displays serial version numbers for classes

Conclusion

In conclusion, checking the version of Java from the command line is a simple process that can be accomplished using the java -version command. This command will display the version of the Java Development Kit (JDK) installed on your system. You can also use additional commands to get more information about the Java installation and to check the version of a specific Java installation. By using these commands, you can ensure that you are using the correct version of Java for your development needs.