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value of the exception The ExceptionDemo class defines a method named compute( ) that throws a MyException object The exception is thrown when compute( ) s integer parameter is greater than 10 The main( ) method sets up an exception handler for MyException, then calls compute( ) with a legal value (less than 10) and an illegal one to show both paths through the code Here is the result: Called Normal Called Caught compute(1) exit compute(20) MyException[20]

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[root@serverA [root@serverA [root@serverA [root@serverA myroot]# myroot]# myroot]# myroot]# cp cp cp cp /lib/libtinfoso5 lib/ /lib/libdlso2 lib/ /lib/libcso6 lib/ /lib/ld-linuxso2 lib/

Beginning with JDK 14, a new feature has been incorporated into the exception subsystem: chained exceptions The chained exception feature allows you to associate another exception with an exception This second exception describes the cause of the first exception For example, imagine a situation in which a method throws an ArithmeticException because of an attempt to divide by zero However, the actual cause of the problem was that an I/O error occurred, which caused the divisor to be set improperly Although the method must certainly throw an ArithmeticException, since that is the error that occurred, you might also want to let the calling code know that the underlying cause was an I/O error Chained exceptions let you handle this, and any other situation in which layers of exceptions exist To allow chained exceptions, two constructors and two methods were added to Throwable The constructors are shown here: Throwable(Throwable causeExc) Throwable(String msg, Throwable causeExc) In the first form, causeExc is the exception that causes the current exception That is, causeExc is the underlying reason that an exception occurred The second form allows you to specify a description at the same time that you specify a cause exception These two constructors have also been added to the Error, Exception, and RuntimeException classes The chained exception methods added to Throwable are getCause( ) and initCause( ) These methods are shown in Table 10-3 and are repeated here for the sake of discussion Throwable getCause( ) Throwable initCause(Throwable causeExc) The getCause( ) method returns the exception that underlies the current exception If there is no underlying exception, null is returned The initCause( ) method associates causeExc with the invoking exception and returns a reference to the exception Thus, you can associate a cause with an exception after the exception has been created However, the cause exception can be set only once Thus, you can call initCause( ) only once for each exception object Furthermore, if the cause exception was set by a constructor, then you can t set it again using initCause( ) In general, initCause( ) is used to set a cause for legacy exception classes that don t support the two additional constructors described earlier Here is an example that illustrates the mechanics of handling chained exceptions:.

// Demonstrate exception chaining class ChainExcDemo { static void demoproc() {

[root@serverA [root@serverA [root@serverA [root@serverA [root@serverA myroot]# myroot]# myroot]# myroot]# myroot]# cp cp cp cp cp /lib/librtso1 lib/ /lib/libselinuxso1 lib/ /lib/libaclso1 lib/ /lib/libpthreadso0 lib/ /lib/libattrso1 lib/

Part I:

In this version, the names sqrt and pow are brought into view by these static import statements:

Figures 4-12 through 4-14 show the program and the three configuration panels for the three blocks used in this program. Notice that the MOVE block has its steering control dragged slightly to the right but not all the way; when I uploaded this to my robot, it caused the robot to move in a counterclockwise direction. You ll need to experiment with the number of rotations; the distance you ve dragged the steering control to the right or left will affect the number of rotations required to return to the starting point. The DISPLAY and WAIT TIME configuration panels are also shown.

Most Linux distros include a little program called chroot that invokes the chroot() system call for us, so we don t need to write our own C program to do it The program takes two parameters: the directory that you want to make the root directory and the command that you want to run in the chroot environment We want to use /tmp/ myroot as the directory and start /bin/bash, thus we run:

import static javalangMathsqrt; import static javalangMathpow;