Conseguindo informações do Sistema Operacional (Nome, Arquitetura 32 ou 64, Versão) - JAVA

Obtendo informações do Nome, Versão e Arquitetura do Sistema Operacional com código JAVA

public static void main(String[] args) {
        String property;
        property = System.getProperty("os.name");
        System.out.println("Nome: "+property);
        property = System.getProperty("os.version");
        System.out.println("Versão: "+property);
        property = System.getProperty("os.arch");
        System.out.println("Arquitetura: "+property);
        property = System.getProperty("sun.arch.data.model");
        System.out.println("Arquitetura: "+property);
    }

outras informações na API do JAVA

Key	Meaning
"file.separator"	Character that separates components of a file path. This is "/" on UNIX and "\" on Windows.
"java.class.path"	Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property.
"java.home"	Installation directory for Java Runtime Environment (JRE)
"java.vendor"	JRE vendor name
"java.vendor.url"	JRE vendor URL
"java.version"	JRE version number
"line.separator"	Sequence used by operating system to separate lines in text files
"os.arch"	Operating system architecture
"os.name"	Operating system name
"os.version"	Operating system version
"path.separator"	Path separator character used in java.class.path
"user.dir"	User working directory
"user.home"	User home directory
"user.name"	User account name