Java Program to display few Operating System (OS) details

public class OperatingSystem {
    public OperatingSystem(){
        try{
        String os;
        os=System.getProperty("os.name");
        System.out.println("Your Operating System (OS): "+os);
        os=System.getProperty("os.version");
        System.out.println("Your OS Version: "+os);
        os=System.getProperty("user.name");
        System.out.println("User Name: "+os);
        os=System.getProperty("user.home");
        System.out.println("Home Directory: "+os);
        os=System.getProperty("user.dir");
        System.out.println("Current Working Directory: "+os);
        }
        catch(NullPointerException e){
            System.err.println("Error Occured!\n"+e.getMessage());
            System.exit(0);
        }
        catch(SecurityException e){
            System.err.println("Error Occured!=n"+e.getMessage());
            System.exit(0);
        }           
    }
    public static void main(String[] args){
        OperatingSystem obj=new OperatingSystem();
    }
}