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Can I import same package/class twice? Will the JVM load the package twice at runtime?
Can I import same package/class twice? Will the JVM load the package twice at runtime? One can import the same package or same class multiple times. Neither compiler nor JVM complains abt it. And the JVM will internally load the class only once no matter how many times you import the same class. 2013-05-09, 2527👍, 0💬

What is the purpose of garbage collection in Java, and when is it used?
What is the purpose of garbage collection in Java, and when is it used? The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unre... 2013-04-23, 2526👍, 0💬

What are the problems faced by Java programmers who don't use layout managers?
What are the problems faced by Java programmers who don't use layout managers? Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints impo... 2012-07-25, 2526👍, 0💬

Which Java operator is right associative?
Which Java operator is right associative? The = operator is right associative. 2012-10-24, 2525👍, 0💬

What is serialization?
What is serialization? Serialization is a mechanism by which you can save the state of an object by converting it to a byte stream. 2013-05-17, 2524👍, 0💬

If I want an object of my class to be thrown as an exception object, what should I do?
If I want an object of my class to be thrown as an exception object, what should I do? The class should extend from Exception class. Or you can extend your class from some more precise exception type also. 2013-05-30, 2523👍, 0💬

What is static in java?
What is static in java? Static means one per class, not one for each object no matter how many instance of a class might exist. This means that you can use them without creating an instance of a class.Static methods are implicitly final, because overriding is done based on the type of the object, an... 2013-05-01, 2523👍, 0💬

Why do threads block on I/O?
Why do threads block on I/O? Threads block on i/o (that is enters the waiting state) so that other threads may execute while the i/o Operation is performed. 2013-02-12, 2519👍, 0💬

What is a Concurrent Low Pause Collector?
What is a Concurrent Low Pause Collector? The concurrent low pause collector is a generational collector similar to the default collector. The tenured generation is collected concurrently with this collector. This collector attempts to reduce the pause times needed to collect the tenured generation.... 2013-03-26, 2518👍, 0💬

What is Data Access Object pattern?
What is Data Access Object pattern? The Data Access Object (or DAO) pattern: separates a data resource's client interface from its data access mechanisms adapts a specific data resource's access API to a generic client interface The DAO pattern allows data access mechanisms to change independently o... 2013-03-15, 2518👍, 0💬

What is the purpose of garbage collection?
What is the purpose of garbage collection? The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources may be reclaimed and reused. 2013-01-11, 2517👍, 0💬

Which class is extended by all other classes?
Which class is extended by all other classes? The Object class is extended by all other classes. 2012-11-12, 2517👍, 0💬

Difference between HashMap and HashTable?
Difference between HashMap and HashTable? The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls. (HashMap allows null values as key and value whereas Hashtable doesnt allow). HashMap does not guarantee that the order of the map will remain constant ... 2013-04-25, 2516👍, 0💬

What state does a thread enter when it terminates its processing?
What state does a thread enter when it terminates its processing? When a thread terminates its processing, it enters the dead state. 2013-04-09, 2516👍, 0💬

What is the range of the short type?
What is the range of the short type? The range of the short type is -(2^15) to 2^15 - 1. 2012-10-15, 2516👍, 0💬

Explain different way of using thread?
Explain different way of using thread? The thread could be implemented by using runnable interface or by inheriting from the Thread class. The former is more advantageous, 'cause when you are going for multiple inheritance..the only interface can help. 2013-04-24, 2513👍, 0💬

What does it mean that a class or member is final?
What does it mean that a class or member is final? A final class can no longer be subclassed. Mostly this is done for security reasons with basic classes like String and Integer. It also allows the compiler to make some optimizations, and makes thread safety a little easier to achieve. Methods may b... 2013-02-18, 2511👍, 0💬

What is the purpose of the System class?
What is the purpose of the System class? The purpose of the System class is to provide access to system resources. 2012-11-27, 2511👍, 0💬

Which characters may be used as the second character of an identifier,but not as the first character of an identifier?
Which characters may be used as the second character of an identifier,but not as the first character of an identifier? The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier. 2013-02-14, 2509👍, 0💬

What is the difference between a while statement and a do statement?
What is the difference between a while statement and a do statement? A while statement checks at the beginning of a loop to see whether the next loop iteration should occur. A do statement checks at the end of a loop to see whether the next iteration of a loop should occur. The do statement will alw... 2013-06-12, 2508👍, 0💬

What invokes a thread's run() method?
What invokes a thread's run() method? After a thread is started, via its start() method or that of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed. 2012-10-18, 2508👍, 0💬

What is the range of the char type?
What is the range of the char type? The range of the char type is 0 to 2^16 - 1. 2012-10-16, 2508👍, 0💬

What is the Vector class?
What is the Vector class? The Vector class provides the capability to implement a growable array of objects 2012-09-25, 2508👍, 0💬

What must a class do to implement an interface?
What must a class do to implement an interface? It must provide all of the methods in the interface and identify the interface in its implements clause. 2012-10-26, 2506👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML