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What restrictions are placed on method overriding?
What restrictions are placed on method overriding? Overridden methods must have the same name, argument list, and return type. The overriding method may not limit the access of the method it overrides. The overriding method may not throw any exceptions that may not be thrown by the overridden method... 2013-01-14, 2255👍, 0💬

Explain the different forms of Polymorphism
Explain the different forms of Polymorphism From a practical programming viewpoint, polymorphism exists in three distinct forms in Java: Method overloading Method overriding through inheritance Method overriding through the Java interface 2013-03-04, 2254👍, 0💬

What are the steps in the JDBC connection?
What are the steps in the JDBC connection? While making a JDBC connection we go through the following steps : Step 1 : Register the database driver by using : Class.forName(" driver classs for that specific database" ); Step 2 : Now create a database connection using : Connection con = DriverManager... 2013-06-15, 2253👍, 0💬

What one should take care of while serializing the object?
What one should take care of while serializing the object? One should make sure that all the included objects are also serializable. If any of the objects is not serializable then it throws a NotSerializableException. 2013-05-23, 2252👍, 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, 2252👍, 0💬

What is the Java API?
What is the Java API? The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets. 2013-02-20, 2252👍, 0💬

Difference between Vector and ArrayList?
Difference between Vector and ArrayList? Vector is synchronized whereas arraylist is not. 2013-04-26, 2251👍, 0💬

Can we make an EJB singleton?
Can we make an EJB singleton? This is a debatable question, and for every answer we propose there can be contradictions. I propose 2 solutions fo the same. Remember that EJB's are distributed componenets and can be deployed on different JVM's in a Distributed environment i) Follow the steps as given... 2013-03-18, 2251👍, 0💬

What advantage do Java's layout managers provide over traditional windowing systems?
What advantage do Java's layout managers provide over traditional windowing systems? Java uses layout managers to lay out components in a consistent manner across all windowing platforms. Since Java's layout managers aren't tied to absolute sizing and positioning, they are able to accommodate platfo... 2012-12-10, 2251👍, 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... 2012-12-07, 2251👍, 0💬

What is the purpose of finalization?
What is the purpose of finalization? The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected. 2013-06-11, 2250👍, 0💬

What is the List interface?
What is the List interface? The List interface provides support for ordered collections of objects. 2013-04-02, 2250👍, 0💬

What is the Map interface?
What is the Map interface? The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values. 2012-11-26, 2249👍, 0💬

What is an Iterator?
What is an Iterator? Some of the collection classes provide traversal of their contents via a java.util.Iterator interface. This interface allows you to walk through a collection of objects, operating on each object in turn. Remember when using Iterators that they contain a snapshot of the collectio... 2013-04-29, 2247👍, 0💬

Are true and false keywords?
Are true and false keywords? The values true and false are not keywords. 2013-01-04, 2247👍, 0💬

What are synchronized methods and synchronized statements?
What are synchronized methods and synchronized statements? 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 ... 2013-06-18, 2246👍, 0💬

Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance()
Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance() which returns an instance of the Calender class. No! You cannot make an instance of an abstract class. An abstract class has to be sub-classed. If you have an abstract cla... 2012-08-21, 2246👍, 0💬

Name the eight primitive Java types.
Name the eight primitive Java types. The eight primitive types are byte, char, short, int, long, float, double, and boolean. 2012-11-29, 2245👍, 0💬

What is the difference between the Boolean & operator and the && operator?
What is the difference between the Boolean & operator and the && operator? If an expression involving the Boolean & operator is evaluated, both operands are evaluated. Then the & operator is applied to the operand. When an expression involving the && operator is evaluated... 2012-10-18, 2245👍, 0💬

Give a simplest way to find out the time a method takes for execution without using any profiling tool?
Give a simplest way to find out the time a method takes for execution without using any profiling tool? Read the system time just before the method is invoked and immediately after method returns. Take the time difference, which will give you the time taken by a method for execution. To put it in co... 2013-05-24, 2244👍, 0💬

If a method is declared as protected, where may the method be accessed?
If a method is declared as protected, where may the method be accessed? A protected method may only be accessed by classes or interfaces of the same package or by subclasses of the class in which it is declared. 2012-12-18, 2244👍, 0💬

Explain the user defined Exceptions?
Explain the user defined Exceptions? User defined Exceptions are the separate Exception classes defined by the user for specific purposed. An user defined can created by simply sub-classing it to the Exception class. This allows custom exceptions to be generated (using throw) and caught in the same ... 2013-02-22, 2243👍, 0💬

What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body
What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement? The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination. 2013-01-18, 2243👍, 0💬

Which Math method is used to calculate the absolute value of a number?
Which Math method is used to calculate the absolute value of a number? The abs() method is used to calculate absolute values. 2012-12-13, 2242👍, 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