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How to get my current system properties in Java?

The System class contains several useful class fields and methods. Accessing the current system properties is one of facilities provided by the System class. For example, to get the operating system name string in Java use the static System.getProperty("os.name") method. Here is a sample code to walk through system properties in Java:

public class SystemPropertiesWalker  { 
 
    public static void main(String[] args) {  
        Properties properties = System.getProperties();
        Set<Object>  sysPropertiesKeys = properties.keySet();
        for (Object key : sysPropertiesKeys) {
            System.out.println(key + " =" + properties.getProperty((String)key));
        }
    }
}

If there is no current set of system properties, a set of system properties is first created and initialized. This set of system properties always includes values for the following keys:

KeyDescription of Associated Value
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator ("/" on UNIX)
path.separator Path separator (":" on UNIX)
line.separator Line separator ("\n" on UNIX)
user.name User's account name
user.home User's home directory
user.dir User's current working directory


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