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Java Interview Questions - Set 1
Posted Date: 07 Feb 2008 Resource Type: Articles/Knowledge Sharing Category: General
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Posted By: Bala Member Level: Diamond
Rating:  Points: 4
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Java Interview Questions - Set 1
1. What are synchronized methods and synchronized statements?
Synchronized methods are methods that are used to control access to an object. For example, 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.
2. What are different ways in which a thread can enter the waiting state?
A thread can enter the waiting state by invoking its sleep() method, blocking on I/O, unsuccessfully attempting to acquire an object’s lock, or invoking an object’s wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
3. Can a lock be acquired on a class?
Yes, a lock can be acquired on a class. This lock is acquired on the class’s Class object.
4. What’s new with the stop(), suspend() and resume() methods in new JDK 1.2?
The stop(), suspend() and resume() methods have been deprecated in JDK 1.2.
5. What is the preferred size of a component?
The preferred size of a component is the minimum component size that will allow the component to display normally.
6. What method is used to specify a container’s layout?
The setLayout() method is used to specify a container’s layout. For example, setLayout(new FlowLayout()); will be set the layout as FlowLayout.
7. Which containers use a FlowLayout as their default layout?
The Panel and Applet classes use the FlowLayout as their default layout.
8. What state does a thread enter when it terminates its processing?
When a thread terminates its processing, it enters the dead state.
9. What is the Collections API?
The Collections API is a set of classes and interfaces that support operations on collections of objects. One example of class in Collections API is Vector and Set and List are examples of interfaces in Collections API.
10. What is the List interface?
The List interface provides support for ordered collections of objects. It may or may not allow duplicate elements but the elements must be ordered.
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