how to get input from barcode reader in java private void readObject(ObjectInputStream in) throws IOException in Java

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private void readObject(ObjectInputStream in) throws IOException
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In the readObject() method, the class should first call defaultReadObject() to restore the serializable data fields, and then perform whatever logic is necessary to initialize the transient fields Typically, this restoration is done by calling another method, which can also be called from the constructor, to avoid duplicate code An example can help clarify this:
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import javaio*;
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public class CounterBean implements Runnable, Serializable { private transient Thread thread; private int count; /** * Creates a new CounterBean, initializes its count * to zero, and starts the counting thread */ public CounterBean() { count = 0; start(); } /** * Restores this CounterBean from an object stream * and restarts the thread */ private void readObject(ObjectInputStream in) throws IOException { try { // Call this first to restore all the // non-transient fields indefaultReadObject(); } catch (ClassNotFoundException e) { throw new IOException(egetMessage()); } // Restart the thread start(); } /**
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* Provides a means to shut down the thread */ public void interrupt() { if (thread != null) threadinterrupt(); } /** * Starts the counting thread This method * is called both from the constructor when * the object is first created and from the * readObject method when the object is deserialized */ private void start() { if (thread == null) { thread = new Thread(this); threadsetPriority(ThreadMIN_PRIORITY); threadstart(); } } /** * Increments and prints the value of the counter * every second */ public void run() { try { for (;;) { Threadsleep(1000); count++; Systemoutprintln(count); } } catch (InterruptedException e) {} } }
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The CounterBean class uses a background thread to print the value of a counter at one-second intervals The class is serializable, but the thread isn t, so logic exists for restarting the thread when the class is deserialized Note, the thread variable is declared with the transient keyword The class has two entry points: its constructor and the readObject() method Both entry points call start(), which creates and starts a thread to handle the counter logic The thread continues to run until it s interrupted A program that uses this counter bean can invoke it by its constructor, serialize it, and then deserialize it with the thread apparently picking up where it left off:
import javaio*; /** * A class that uses CounterBean If a serialized * version exists, it will deserialize that Otherwise, * it will create a new CounterBean */ public class CBTest { public static void main(String[] args) throws IOException, ClassNotFoundException { CounterBean bean = null; // If a serialized version exists, load it File file = new File("counterser"); if (fileexists()) { Systemoutprintln("Deserializing bean"); FileInputStream fileIn = new FileInputStream(file); ObjectInputStream objIn = new ObjectInputStream(fileIn); bean = (CounterBean) objInreadObject(); objInclose(); fileInclose(); } // Otherwise, create a new bean else { Systemoutprintln("Creating new bean");
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bean = new CounterBean(); } // Let the bean run until the user presses the // enter key BufferedReader in = new BufferedReader( new InputStreamReader( Systemin)); Systemoutprintln("Press Enter to terminate program"); inreadLine(); beaninterrupt(); // Serialize the bean Systemoutprintln("Serializing bean"); FileOutputStream fileOut = new FileOutputStream(file); ObjectOutputStream objOut = new ObjectOutputStream(fileOut); objOutwriteObject(bean); objOutflush(); objOutclose(); fileOutclose(); } }
Instead of implementing Serializable, a bean may implement Externalizable for its persistence scheme An Externalizable object handles its own reading and writing from object streams, using whatever format it chooses It must provide readExternal(ObjectInput) and writeExternal(ObjectOutput) methods for this purpose But, because Serializable objects can supply their own readObject() methods using any format desired, Externalizable offers few advantages and isn t widely used
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