c# code 128 reader

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Multiple inheritance is one of those features that cause controversy. OCaml fully supports multiple inheritance, as do languages such as Python and C++. Java, however, does not. Even in languages that support it, its use is rare. Multiple inheritance occurs when a class inherits from two classes that share a common ancestor. Demonstrating multiple inheritance requires a few classes to be created. These classes do not really do anything, but they serve as good examples of what multiple inheritance is, what problems it solves, and why people think it is a bad idea. Suppose that you are designing an HR system. You start to work on the parts that deal with employees, so you start with an employee base class. This class has hire and fire methods, and holds information common to all employees. class employee = object val mutable hiredate = "" val mutable isactive = false val mutable firedate = "" method hireDate () = hiredate method isActive () = isactive method terminationDate () = firedate method hire x = hiredate <- x;isactive <- true method fire x = firedate <- x;isactive <- false end;; The company is a trading firm, so you also have to create a specific class for employees who are traders. Traders have limits on the quantities they can trade and should have those limits eliminated when they are fired.

We presented the code for AbstractRenderer in the preceding section (see Listing 13-2), so now we ll show you the code for SimpleTriangleRenderer.

As discussed earlier in the section on SD cards, if your application s minSdkVersion is 4 or higher, you will also need to add a uses-permission tag for "android.permission.WRITE_EXTERNAL_STORAGE". Finally, if you are going to try this out with the emulator, you ll need to provide a microphone input on your workstation. If you look at the onCreate() method in Listing 9 5, you ll see that the on-click event handlers are wired up for the four buttons. The beginRecording() method handles

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recording To record audio, you must create an instance of MediaRecorder and set the audio source, output format, audio encoder, and output file Up until Android SDK 16, the only supported audio source was the microphone Since Android SDK 16, there are three more audio sources available, all related to phone calls You can record the entire call (MediaRecorderAudioSourceVOICE_CALL), the uplink side only (MediaRecorderAudioSourceVOICE_UPLINK), or the downlink side only (MediaRecorderAudioSourceVOICE_DOWNLINK) The uplink side of a call would be the voice of the phone s user The downlink side of the call would be sounds coming from the other end of the call The only supported output format for audio is 3rd Generation Partnership Project (3GPP) You must set the encoder to AMR_NB, which signifies the Adaptive Multi-Rate (AMR) narrowband audio codec, as this is the only supported audio encoder.

class trader = object(s) inherit employee as super val mutable limit_quant = 0 method canTrade () = (limit_quant > 0) && isactive method setLimit x = limit_quant <- x method fire x = super#fire x;s#setLimit 0 end;; The company employs researchers who cannot trade, but they can study things So researchers also inherit from the employee base class and extend that class with new methods class researcher = object(r) inherit employee val mutable studies: string list = [] method studies x = Listmem x studies method addStudies x = studies <- x :: studies end;; This class looks pretty good Then the head of HR tells you that the company also has trader-researchers who can trade and have the same activities as both a trader and a researcher.

The code for the SimpleTriangleRenderer class (see Listing 13-3) is the same as the code for the corresponding class in 10 (see Listing 10-12), except that the classes inherit from a different AbstractRenderer. Listing 13-3. SimpleTriangleRenderer Source Code //filename: SimpleTriangleRenderer.java public class SimpleTriangleRenderer extends AbstractRenderer { //Number of points or vertices we want to use private final static int VERTS = 3;

The recorded audio in our example is written to the SD card at /sdcard/recordoutput3gpp Note that Listing 9 5 assumes that you ve created an SD card image and that you ve pointed the emulator to the SD card If you have not done this, refer to the section Understanding and Using SD Cards for details on setting this up There are some additional methods to the MediaRecorder that you might find useful In order to limit the length and size of audio recordings, the methods setMaxDuration(int length_in_ms) and setMaxFileSize(long length_in_bytes) can be used You would set the maximum length of the recording, in milliseconds, or the maximum length of the recording file, in bytes, to stop recording when these limits are reached These were both introduced with Android 15 so they are available on some older phones Note that the current media APIs do not support streaming.

For example, if you record audio, you cannot access the audio stream during the recording process (for analysis purposes, for example) Instead, you have to write the audio content to a file first and then work with it Future releases of the Android SDK will likely support audio streaming One way that you might try to work around this is to write the audio to a file, and read the file with another thread or application as it s being written..

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