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When working with overloaded constructors, it is sometimes useful for one constructor to invoke another In Java, this is accomplished by using another form of the this keyword The general form is shown here: this(arg-list) When this( ) is executed, the overloaded constructor that matches the parameter list specified by arg-list is executed first Then, if there are any statements inside the original constructor, they are executed The call to this( ) must be the first statement within the constructor To understand how this( ) can be used, let s work through a short example First, consider the following class that does not use this( ):

Figures 4-15 and 4-16 show the program and the two configuration panels for the two blocks used in this program. Notice that the first MOVE block has its steering control dragged slightly to the right with a Duration setting of 3 rotations. This will have the robot rolling forward in a counterclockwise direction. After 3 rotations of the motors, the second MOVE block will have the robot roll forward for 3 rotations, but this time the steering control is dragged to the left slightly. This will have the robot rolling forward in a clockwise direction, finishing the S-shaped path.

class MyClass { int a; int b; // initialize a and b individually MyClass(int i, int j) { a = i; b = j; } // initialize a and b to the same value MyClass(int i) { a = i; b = i; } // give a and b default values of 0 MyClass( ) { a = 0; b = 0; } }

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13:

This class contains three constructors, each of which initializes the values of a and b The first is passed individual values for a and b The second is passed just one value, which is assigned to both a and b The third gives a and b default values of zero By using this( ), it is possible to rewrite MyClass as shown here:

Traditional Linux security is based on a Discretionary Access Control (DAC) model The DAC model allows the owner of a resource (objects) to control which users or groups (subjects) can access the resource It is called discretionary because the access control is based on the discretion of the owner Another type of security model is the Mandatory Access Control (MAC) model Unlike the DAC model, the MAC model uses predefined policies to control user and process interactions The MAC model restricts the level of control that users have over the objects that they create SELinux is an implementation of the MAC model in the Linux kernel The United States government s National Security Agency (NSA) has taken an increasingly public role in information security, especially due to the growing concern over information security attacks that could pose a serious threat to the world s ability to function With Linux becoming an increasingly key component of enterprise computing, the NSA set out to create a set of patches to increase the security of Linux The patches have all been released under the GNU Public License (GPL) license with full source code and, thus, are subject to the scrutiny of the world an important aspect given Linux s worldwide presence and developer community The patches are collectively known as SELinux, short for Security-Enhanced Linux The patches have been integrated into the 26 Linux kernel series using the Linux Security Modules (LSM) This integration has made the patches and improvements far-reaching and an overall benefit to the Linux community SELinux makes use of the concepts of subjects (users, applications, processes, etc), objects (files, sockets), labels (metadata applied to objects), and policies (describe the matrix of access permissions for subjects and objects) Given the extreme granularity of objects, it is possible to express rich and complex rules that dictate the security model and behavior of a Linux system Because SELinux uses labels, it requires a file system that supports extended attributes The full gist of SELinux is well beyond the scope of a single section in this book If you are interested in learning more about SELinux, visit the SELinux web site at www nsagov/selinux.