Show all system properties

Determines the current system properties. The current set of system properties for use by the getProperty(String) method is returned as a properties object. If there is no current set of system properties, a set of system properties is first created and initialized.

class SystemPropertiesExample {
    public static void main(String[] args) {
        System.out.println(System.getProperties().toString()
                .replace(',', '\n'));
    }
}

Output

...

 jdk.debug=release
 sun.cpu.endian=little
 user.home=/Users/...
 user.language=en
 java.specification.vendor=Oracle Corporation
 java.version.date=2021-01-19
 java.home=/Library/Java/JavaVirtualMachines/jdk-11.0.10.jdk/Contents/Home
 file.separator=/
 java.vm.compressedOopsMode=Zero based
 line.separator=

 java.specification.name=Java Platform API Specification
 java.vm.specification.vendor=Oracle Corporation
 java.awt.graphicsenv=sun.awt.CGraphicsEnvironment
 sun.management.compiler=HotSpot 64-Bit Tiered Compilers

...