More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know.
Ans. Suspend method is used to suspend thread which can be restarted by using resume() method. stop() is used to stop the thread, it cannot be restarted again.
Help us improve. Please let us know the company, where you were asked this question :
Q277. Tell something about BufferedWriter ? What are flush() and close() used for ?
Ans. BufferedWriter is temporary source for data storage.BufferedWriter is used to write character data to the file.Flush() is method available in B.W which ensures that all data items are written to file including last character.Close() is used to closes the character output stream.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Scanner class introduced in Java 1.5 for reading Data Stream from the imput device. Previously we used to write code to read a input using DataInputStream. After reading the stream , we can convert into respective data type using in.next() as String ,in.nextInt() as integer, in.nextDouble() as Double etc
Help us improve. Please let us know the company, where you were asked this question :
Usually asked only to fresh graduates and less experienced developers.
Q279. What is a daemon thread? Give an Example ?
Ans. These are threads that normally run at a low priority and provide a basic service to a program or programs when activity on a machine is reduced. garbage collector thread is daemon thread.
Help us improve. Please let us know the company, where you were asked this question :
Ans. LDAP servers are typically used in J2EE applications to authenticate and authorise users. LDAP servers are hierarchical and are optimized for read access, so likely to be faster than database in providing read access.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other.
Help us improve. Please let us know the company, where you were asked this question :
Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using and elements.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Translation of JSP PageCompilation of JSP PageClassloading (class file is loaded by the classloader)Instantiation (Object of the Generated Servlet is created).Initialization ( jspInit() method is invoked by the container).Reqeust processing ( _jspService() method is invoked by the container).Destroy ( jspDestroy() method is invoked by the container).
Help us improve. Please let us know the company, where you were asked this question :
Ans. ThreadFactory is an interface that is meant for creating threads instead of explicitly creating threads by calling new Thread(). Its an object that creates new threads on demand. Using thread factories removes hardwiring of calls to new Thread, enabling applications to use special thread subclasses, priorities, etc.
Help us improve. Please let us know the company, where you were asked this question :
Ans. The accessibility (public, protected, etc.) of the inner class is defined by the outer class.
Just like top-level classes, an inner class can extend a class or can implement interfaces.
Similarly, an inner class can be extended by other classes, and an inner interface can be implemented or extended by other classes or interfaces.
An inner class can be declared final or abstract.Inner classes can have inner classes, but you will have a hard time reading or understanding such complex nesting of classes.
Help us improve. Please let us know the company, where you were asked this question :
Which of the following is not type of inner classes ?
Simple Inner Class
Static Nested Inner Class
Method Nested Static Inner Class
Anonymous Inner Class
Which of following can be nested into another ?
class within another class
class within interface
interface within class
All of above
Q290. What is the advantage of using arrays over variables ?
Ans. Arrays provide a structure wherein multiple values can be accessed using single reference and index. This helps in iterating over the values using loops.
Help us improve. Please let us know the company, where you were asked this question :
Q291. Difference between Class#getInstance() and new operator ?
Ans. Class.getInstance doesn't call the constructor whereas if we create an object using new operator , we need to have a matching constructor or copiler should provide a default constructor.
Help us improve. Please let us know the company, where you were asked this question :
Ans. It's a technique to allow multiple clients to make use of a cached set of shared and reusable connection objects providing access to a database or other resource.
Help us improve. Please let us know the company, where you were asked this question :
Q294. What is the difference between System.out ,System.err and System.in?
Ans. System.out and System.err both represent the monitor by default and hence can be used to send data or results to the monitor. But System.out is used to display normal messages and results whereas System.err is used to display error messages and System.in represents InputStream object, which by default represents standard input device, i.e., keyboard.
Help us improve. Please let us know the company, where you were asked this question :
Ans. Java is a portable-language because without any modification we can use Java byte-code in any platform(which supports Java). So this byte-code is portable and we can use in any other major platforms.
Help us improve. Please let us know the company, where you were asked this question :
Ans. throw is used to explicitly throw an exception especially custom exceptions, whereas throws is used to declare that the method can throw an exception.
We cannot throw multiple exceptions using throw statement but we can declare that a method can throw multiple exceptions using throws and comma separator.
Help us improve. Please let us know the company, where you were asked this question :
Ans. No. Even though "this" would mean a reference to current object id the method gets called using object reference but "this" would mean an ambiguity if the same static method gets called using Class name.
Help us improve. Please let us know the company, where you were asked this question :
More than 3000 questions in repository.
Discuss 
java exceptions checked exceptions unchecked exceptions exception handling 
Asked in 2 Companies
basic 
frequent
Try 1 Question(s) Test
Usually asked only to fresh graduates.
Which of the following methods are used by Java Garbage Collection Mechanism ?
