The JavaTM Tutorial

| Start of Tutorial > Start of Trail > Start of Lesson | Search

Trail: Security in Java 2 SDK 1.2
Lesson: Quick Tour of Controlling Applications

## Observe Application Freedom

> A security manager is not automatically installed when an application is running. In the next step, you'll see how to apply the same security policy to an application found on the local file system as to downloaded applets. But first, let's demonstrate that a security manager is by default not installed for an application, and thus the application has full access to resources, as was always the case in JDK 1.1.

> Create a file named `GetProps.java` on your computer by either copying or downloading the `GetProps.java` source code.

> The examples in this lesson assume that you put `GetProps.java` in the `C:\Test` directory if you're using a Windows system or in the `~/test` directory on UNIX.

> As you can see if you examine the source file, this program tries to get (read) the values of various properties, whose names are `"os.name"` , `"java.version"`, `"user.home"`, and `"java.home"`.

> Now compile and run `GetProps.java`. You should see output like the following:

> >     C:\TEST>java GetProps
> >         About to get os.name property value
> >           The name of your operating system is: Windows 95
> >         About to get java.version property value
> >           The version of the JVM you are running is: 1.2.2
> >         About to get user.home property value
> >           Your user home directory is: C:\WINDOWS
> >         About to get java.home property value
> >           Your JRE installation directory is: C:\JDK1.2.2\JRE

> As you can see, the application was allowed to access all the property values, as shown in the following figure.

| Start of Tutorial > Start of Trail > Start of Lesson | Search