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This program generates the following output: Division by zero After catch statement Notice that the call to println( ) inside the try block is never executed Once an exception is thrown, program control transfers out of the try block into the catch block Put differently, catch is not called, so execution never returns to the try block from a catch Thus, the line This will not be printed is not displayed Once the catch statement has executed, program control continues with the next line in the program following the entire try/catch mechanism A try and its catch statement form a unit The scope of the catch clause is restricted to those statements specified by the immediately preceding try statement A catch statement cannot catch an exception thrown by another try statement (except in the case of nested try statements, described shortly) The statements that are protected by try must be surrounded by curly braces (That is, they must be within a block) You cannot use try on a single statement The goal of most well-constructed catch clauses should be to resolve the exceptional condition and then continue on as if the error had never happened For example, in the next program each iteration of the for loop obtains two random integers Those two integers are divided by each other, and the result is used to divide the value 12345 The final result is put into a If either division operation causes a divide-by-zero error, it is caught, the value of a is set to zero, and the program continues

// Handle an exception and move on import javautilRandom; class HandleError { public static void main(String args[]) {

Don t forget to append your change to the /etc/sysctlconf file if you want the change to be persistent

10:

int a=0, b=0, c=0; Random r = new Random(); for(int i=0; i<32000; i++) { try { b = rnextInt(); c = rnextInt(); a = 12345 / (b/c); } catch (ArithmeticException e) { Systemoutprintln("Division by zero"); a = 0; // set a to zero and continue } Systemoutprintln("a: " + a); } } }

Debugging hardware conflicts is always a chore You can ease the burden by using some of the entries in /proc These two entries are specifically designed to tell you what s going on with your hardware: /proc/ioports tells you the relationships of devices to I/O ports and whether there are any conflicts With PCI devices becoming dominant, this isn t as big an issue Nevertheless, as long as you can buy a new motherboard with Industry Standard Architecture (ISA) slots, you ll always want to have this option /proc/interrupts shows you the association of interrupt numbers to hardware devices Again, like /proc/ioports, PCI is making this less of an issue

Throwable overrides the toString( ) method (defined by Object) so that it returns a string containing a description of the exception You can display this description in a println( ) statement by simply passing the exception as an argument For example, the catch block in the preceding program can be rewritten like this:

And how do you actually calibrate your robot s sensors to the environment where it will be performing actions The answer is simple, and I ll give you examples for both the Sound sensor and the Light sensor. Let s look at the Light sensor first. If you ve built a robot with a Light sensor (or multiple Light sensors) and you want to calibrate them to the current surroundings, the first thing you need to do is place two CALIBRATE blocks inside your program, preferably at the beginning of the program. The help

SysFS (short for system file system) is similar to the proc file system previously discussed in this chapter The major similarities between the two are that they are both virtual file systems (in-memory file system) and they both provide a means for information (data structures, actually) to be exported from within the kernel to the user space SysFS is usually mounted at the /sys mount point The SysFS file system can be used to obtain information about kernel objects, such as devices, modules, the system bus, firmware, and so on This file system provides a view of the device tree (among other things) as the kernel sees it This view displays most of the known attributes of detected devices, such as the device name, vendor name, PCI class, IRQ and Direct Memory Access (DMA)

catch (ArithmeticException e) { Systemoutprintln("Exception: " + e); a = 0; // set a to zero and continue }