Jasper Reports Developer Interview Preparation Guide
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Jasper Reports Developer Frequently Asked Questions in various Jasper Reports Developer job Interviews by interviewer. The set of questions here ensures that you offer a perfect answer posed to you. So get preparation for your new job hunting

57 Jasper Reports Developer Questions and Answers:

1 :: How the Observer and Observable used in Java Programming?

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.
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2 :: Described about synchronization and why is it important in Java Programming?

With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared object while another thread is in the process of using or updating that object's value. This often causes dirty data and leads to significant errors.
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3 :: What are synchronized methods and tell me about the synchronized statements in Java Programming?

Synchronized methods are methods that are used to control access to an object. A thread only executes a synchronized method after it has acquired the lock for the method's object or class. Synchronized statements are similar to synchronized methods. A synchronized statement can only be executed after a thread has acquired the lock for the object or class referenced in the synchronized statement.
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4 :: Which three ways in which thread can enter the waiting state in Java Programming?

A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
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5 :: Can lock be acquired on a class in Java Programming?

Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object.
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6 :: What is new with the stop(), suspend() and resume() methods in JDK 1.2?

The stop(), suspend() and resume() methods have been deprecated in JDK 1.2.
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7 :: What is preferred size of a component in Java Programming?

The preferred size of a component is the minimum component size that will allow the component to display normally.
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8 :: Which containers use the FlowLayout as their default layout in Java Programming?

The Panel and Applet classes use the FlowLayout as their default layout.
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9 :: Which method is used to specify container's layout in Java Programming?

The setLayout() method is used to specify a container's layout in Java Programming.
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10 :: Described the Collections API in Java Programming?

The Collections API is a set of classes and interfaces that support operations on collections of objects.
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