Java2007-09-10
instanceof sample program in Java
Sometimes, knowing the type of an object during run time is useful. For example, you might have one thread of execution that generates various types of objects, and another thread
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Java2007-09-10
Transient vs Volatile modifiers in Java
Java defines two interesting type modifiers: transient and volatile. These modifiers are used to handle somewhat specialized situations.
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Reading from a file and writing to a file using Java program
Java provides a number of classes and methods that allow you to read and write files. In Java, all files are byte-oriented, and Java provides methods to read and write bytes from a
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Using PrintWriter in Java
Although using System.out to write to the console is still permissible under Java, its use is recommended mostly for debugging purposes or for sample programs, such as those found
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Error applying transforms. Verify that the specified transform paths are valid.
You are probably attempting to install the Java 2 Runtime Environment, Standard Edition (JRE) or the JDK 1.4.xx version in your Windows server. But alas, a message box with the fol
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readLine() to read strings from console input
To read a string from the keyboard, use the version of readLine() that is a member of the BufferedReader class. Its general form is shown here:
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Java2007-09-08
Using read() to read one character at a time from console input
Each time that read() is called, it reads a character from the input stream and returns it as an integer value. It returns –1 when the end of the stream is encountered.
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What is a deadlock and how to avoid it in Java
A special type of error that you need to avoid that relates specifically to multitasking is deadlock, which occurs when two threads have a circular dependency on a pair of synchron
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wait(), notify() and notifyAll() in Java - A tutorial
To avoid polling, Java includes an elegant interrocess communication mechanism via the wait(), notify(), and notifyAll() methods. These methods are implemented as final methods in
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call() and synchronized keyword - When and how to use in Java
Synchronization is easy in Java, because all objects have their own implicit monitor associated with them. To enter an object's monitor, just call a method that has been modified w
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setPriority() and getPriority() in Java
Thread priorities are used by the thread scheduler to decide when each thread should be allowed to run. In theory, higher-priority threads get more CPU time than lower-priority thr
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isAlive() and join() in Java
The main thread must be the last thread to finish. Sometimes this is accomplished by calling sleep() within main(), with a long enough delay to ensure that all child threads termin
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