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Explain the Encapsulation principle
Explain the Encapsulation principle Encapsulation is a process of binding or wrapping the data and the codes that operates on the data into a single entity. This keeps the data safe from outside interface and misuse. One way to think about encapsulation is as a protective wrapper that prevents code ... 2013-02-28, 2429👍, 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, 2428👍, 0💬

Why are the methods of the Math class static?
Why are the methods of the Math class static? So they can be invoked as if they are a mathematical code library. 2012-12-28, 2425👍, 0💬

How can I print a character in a printf format string?
How can I print a '%' character in a printf format string? I tried \%, but it didn't work. Simply double the percent sign: %% . The reason it's tricky to print % signs with printf is that % is essentially printf's escape character. Whenever printf sees a %, it expects it to be followed by a characte... 2015-11-09, 2424👍, 0💬

What is HashMap and Map?
What is HashMap and Map? Map is Interface and Hashmap is class that implements that. 2013-04-25, 2424👍, 0💬

Does Java provide any construct to find out the size of an object?
Does Java provide any construct to find out the size of an object? No there is not sizeof operator in Java. So there is not direct way to determine the size of an object directly in Java. 2013-05-24, 2420👍, 0💬

The superclass constructor runs before the subclass constructor ...
The superclass constructor runs before the subclass constructor ... The superclass constructor runs before the subclass constructor. The subclass's version of the overridable method will be invoked before the subclass's constructor has been invoked. If the subclass's overridable method depends on th... 2013-03-06, 2420👍, 0💬

What are Access Specifiers available in Java?
What are Access Specifiers available in Java? ccess specifiers are keywords that determines the type of access to the member of a class. These are: Public Protected Private Defaults 2013-03-04, 2420👍, 0💬

What is the purpose of the File class?
What is the purpose of the File class? The File class is used to create objects that provide access to the files and directories of a local file system. 2012-12-12, 2420👍, 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, 2420👍, 0💬

How does JSP handle run-time exceptions?
How does JSP handle run-time exceptions? You can use the errorPage attribute of the page directive to have uncaught runtime exceptions automatically forwarded to an error processing page. For example: redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during requ... 2013-07-25, 2419👍, 0💬

What is externalization? Where is it useful??
What is externalization? Where is it useful?? Use the Externalizable interface when you need complete control over your Bean's serialization (for example, when writing and reading a specific file format). 2013-03-08, 2419👍, 0💬

Can an Interface have an inner class?
Can an Interface have an inner class? Yes public interface abc { static int i=0; void dd(); class a1 { a1() { int j; System.out.println("in interfia"); }; public static void main(String a1[]) { System.out.println("in interfia"); } } } 2013-02-04, 2418👍, 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, 2418👍, 0💬

Describe the wrapper classes in Java.
Describe the wrapper classes in Java. Wrapper class is wrapper around a primitive data type. An instance of a wrapper class contains, or wraps, a primitive value of the corresponding type. Following table lists the primitive types and the corresponding wrapper classes: Primitive Wrapper boolean java... 2013-03-05, 2417👍, 0💬

How are the elements of a CardLayout organized?
How are the elements of a CardLayout organized? The elements of a CardLayout are stacked, one on top of the other, like a deck of cards. 2012-11-28, 2417👍, 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... 2013-01-31, 2416👍, 0💬

How do you enable the concurrent garbage collector on Sun's JVM?
How do you enable the concurrent garbage collector on Sun's JVM? -Xconcgc options allows us to use concurrent garbage collector (1.2.2_07+)we can also use -XX:+UseConcMarkSweepGC which is available beginning with J2SE 1.4.1. 2013-03-28, 2415👍, 0💬

I made my class Cloneable but I still get 'Can't access protected method clone. Why?
I made my class Cloneable but I still get 'Can't access protected method clone. Why? Yeah, some of the Java books, in particular "The Java Programming Language", imply that all you have to do in order to have your class support clone() is implement the Cloneable interface. Not so. Perhaps that was t... 2013-02-07, 2415👍, 0💬

Are true and false keywords?
Are true and false keywords? The values true and false are not keywords. 2013-01-04, 2415👍, 0💬

What is JVM?
What is JVM? JVM stands for Java Virtual Machine. It is the run time for java programs. All are java programs are running inside this JVM only. It converts java byte code to OS specific commands. In addition to governing the execution of an application's byte codes, the virtual machine handles relat... 2013-03-13, 2414👍, 0💬

What is the purpose of a statement block?
What is the purpose of a statement block? A statement block is used to organize a sequence of statements as a single statement group. 2013-01-24, 2413👍, 0💬

What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution?
What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution? A method's throws clause must declare any checked exceptions that are not caught within the body of the method. 2012-12-27, 2410👍, 0💬

What is the difference between a.Equals(b) and a == b?
What is the difference between a.Equals(b) and a == b? Answer1: a=b is used for assigning the values (rather then comparison) and a==b is for comparison. Answer2: a == b is used to compare the references of two objects a.Equals(b) is used to compare two objects Answer3: A equals b -&gt; copies c... 2014-02-26, 2409👍, 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