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What interface must an object implement before it can be written to a stream as an object?
What interface must an object implement before it can be written to a stream as an object? An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object. 2013-01-10, 2304👍, 0💬

What are runtime exceptions?
What are runtime exceptions? Runtime exceptions are those exceptions that are thrown at runtime because of either wrong input data or because of wrong business logic etc. These are not checked by the compiler at compile time. 2013-05-28, 2300👍, 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, 2300👍, 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, 2299👍, 0💬

What is synchronization and why is it important?
What is synchronization and why is it important? 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... 2013-02-12, 2299👍, 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, 2299👍, 0💬

What is JIT?
What is JIT? JIT stands for Just In Time compiler. It compiles java byte code to native code. 2013-03-13, 2298👍, 0💬

What is the difference between Debug.Write and Trace.Write? When should each be used?
What is the difference between Debug.Write and Trace.Write? When should each be used? Answer1: The Debug.Write call won’t be compiled when the DEBUG symbol is not defined (when doing a release build). Trace.Write calls will be compiled. Debug.Write is for information you want only in debug builds... 2014-02-24, 2297👍, 0💬

Is there a way to reference the "this" variable within a JSP page?
Is there a way to reference the "this" variable within a JSP page? Yes, there is. Under JSP 1.0, the page implicit object is equivalent to "this", and returns a reference to the servlet generated by the JSP page. 2013-07-30, 2296👍, 0💬

How does an exception permeate through the code?
How does an exception permeate through the code? An unhandled exception moves up the method stack in search of a matching When an exception is thrown from a code which is wrapped in a try block followed by one or more catch blocks, a search is made for matching catch block. If a matching type is fou... 2013-05-31, 2296👍, 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, 2296👍, 0💬

What happens to the static fields of a class during serialization?
What happens to the static fields of a class during serialization? There are three exceptions in which serialization doesnot necessarily read and write to the stream. These are 1. Serialization ignores static fields, because they are not part of ay particular state state. 2. Base class fields are on... 2013-05-23, 2295👍, 0💬

What is HashMap and Map?
What is HashMap and Map? Map is Interface and Hashmap is class that implements that. 2013-04-25, 2294👍, 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, 2292👍, 0💬

How do I serialize an object to a file?
How do I serialize an object to a file? The class whose instances are to be serialized should implement an interface Serializable. Then you pass the instance to the ObjectOutputStream which is connected to a fileoutputstream. This will save the object to a file. 2013-05-20, 2292👍, 0💬

What are the Object and Class classes used for?
What are the Object and Class classes used for? The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program. 2013-01-25, 2292👍, 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, 2290👍, 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, 2290👍, 0💬

What is Externalizable interface?
What is Externalizable interface? Externalizable is an interface which contains two methods readExternal and writeExternal. These methods give you a control over the serialization mechanism. Thus if your class implements this interface, you can customize the serialization process by implementing the... 2013-05-22, 2289👍, 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, 2289👍, 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, 2286👍, 0💬

What is an Iterator interface?
What is an Iterator interface? The Iterator interface is used to step through the elements of a Collection. 2012-09-26, 2285👍, 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, 2284👍, 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, 2283👍, 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