By Paul Hyde
It truly is outstanding how a lot is thought in so much after-market Java books! i cannot estimate how frequently i have visible, "It is believed you recognize approximately Threaded Programming, and consequently it's not lined here." good, excellent news, it really is coated right here. And is is roofed well.
As a qualified programmer for twenty years, i will be able to attest to the truth that Thread programming is the main schizophrenic of disciplines. furthermore, seeing that such a lot legacy thread recommendations come from 'procedural' languages, the Java implementation has a tendency to be challenging to carry on to.
I chanced on this booklet to be an excellent 'primer' into Java's Thread services. It does not try to relate to older languages. It starts off from the begining, and offers its topic essentially. it is a sturdy studying software, and is prepared good adequate to be a competent refference.
Even when you have event with threading, this can be worthy it to orient your head to Java Threading.
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Additional info for Java Thread Programming
Initially, the text message is “never started” (line 13), and the dial is totally white (arcLen = 0, line 14). After the timer is started, the text message indicates the total elapsed time in fractional seconds. The dial sweeps out a blue-filled arc in a clockwise direction that completes 360 degrees every 60 seconds. The dial portion is very similar to the second hand on an analog watch or clock. The paint() method (lines 48–63) handles the drawing of the component based on the current values of timeMsg and arcLen.
58 - While the main thread is sleeping, the newly spawned thread enters the run() method (line 4). For comparison purposes, it prints out the value of pi held as a constant in the Math class (lines 6–7). PI (line 8). The private method calcPi() declares that it might throw an InterruptedException (line 18). It will do this if interrupted before getting within the specified accuracy. The technique used to calculate pi is to sum the terms of the infinite series pi = 4/1 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 + 4/13 - 4/15 ...
The event handling thread returns from stopClock() and proceeds to enable the Start button and give it the focus (lines 36 and 37). The event handling thread then returns from actionPerformed() and returns to the JavaVM’s event queue to wait for new events to occur. 8. 8: Stop was pressed after the timer ran for approximately 75 seconds. Checking the Accuracy of SecondCounter During every iteration of the while loop of SecondCounterRunnable, a 100ms sleep is used to achieve the 1/10-second delay between each increment of the counter.