Question
How are Observer Interface and Observable class, in java.util package, used?
Answers
Objects that subclass the Observable class maintain a list of Observers. When an Observable object is updated it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.   Your Comment




  • Contributors: *,
More Java,observer Questions..
Can variables be used in Java without initialization?
What is the difference between java bean and enterprise java bean?
How does the java database connectivity (jdbc) work?
What are the advantages of threads in java?
What Is Java Api For Xml-based Rpc (jax-rpc)?
What is static synchronized method in JDBC API? Give an example?
Should we override finalize method
What is object cloning in Java?
What is difference between notify() and notfiyAll()
Describe java's security model.
Is there is any error if you have multiple main methods in the same class?
What is the name of the method used to schedule a thread for execution?

1) init();

2) start();

3) run();

4) resume();

5) sleep();
Can I import the same package/class twice? Will the JVM load the package twice at runtime?
What releases of Java technology are currently available? What do they contain?
What is asymmetric clustering in WebSphere?
What is pass by value and pass by reference?
What are the actions that can occur when a thread enters blocked state
How do I launch the browser using WebDriver
What is the use of Void(0)?
How does the native language C or C++ understand data types in JAVA


Search
Can you Answer!!
  • Q How would you promote a positive energy with your team through both positive and negative situations?
  • Q Mention what is the relation between an instance and ami?
  • Q What is logical name of the object
  • Q What is the menu path & t. Code for defining special characters for projects?
  • Q How does free() know how much memory should be released?
  • Q What are the LMHOSTS files?
  • Q What dance is usually performed to Orpheus in the Underworld
  • Q What is the correct name for The Laughing Jackass
  • Q What are the contents of frs?
  • Q How To Defragment Table Indexes?
  • Q What is the purpose of file object of scripting.filesystemobject class in vbscript?