Java Questions - Part IV

  81. What is the purpose of the enableEvents() method?

      The enableEvents() method is used to enable an event for a particular object. Normally, an event is enabled when a listener is added to an object for a particular event. The enableEvents() method is used by objects that handle events by overriding their event-dispatch methods.

  82. What is the difference between the File and RandomAccessFile classes?

      The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods needed to directly access data contained in any part of a file.

  83. What interface must an object implement before it can be written to a stream as an object?

      An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.

  84. What is the ResourceBundle class?

      The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program’s appearance to the particular locale in which it is being run.

  85. What is the difference between a Scrollbar and a ScrollPane?

      A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling.

  86. What is a Java package and how is it used?

      A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces. Packages are also used to organize related classes and interfaces into a single API unit and to control accessibility to these classes and interfaces.

  87. What are the Object and Class classes used for?

      The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program.

  88. What is Serialization and deserialization?

      Serialization is the process of writing the state of an object to a byte stream.
      Deserialization is the process of restoring these objects.

  90. How you restrict a user to cut and paste from the html page ?

      Using javascript to lock keyboard keys. It is one of solutions.

  91. Is Java a super set of JavaScript ?

      No. They are completely different. Some syntax may be similar.

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