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Can applets communicate with each other?
Can applets communicate with each other? At this point in time applets may communicate with other applets running in the same virtual machine. If the applets are of the same class, they can communicate via shared static variables. If the applets are of different classes, then each will need a refere... 2013-06-14, 2284👍, 0💬

Describe the principles of OOPS
Describe the principles of OOPS There are three main principals of oops which are called Polymorphism, Inheritance and Encapsulation. 2013-02-28, 2284👍, 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, 2284👍, 0💬

Can an object be garbage collected while it is still reachable?
Can an object be garbage collected while it is still reachable? A reachable object cannot be garbage collected. Only unreachable objects may be garbage collected.. 2012-11-12, 2284👍, 0💬

What type of parameter passing does Java support?
What type of parameter passing does Java support? In Java the arguments are always passed by value . 2013-05-16, 2282👍, 0💬

What happens when you add a double value to a String?
What happens when you add a double value to a String? The result is a String object. 2013-01-08, 2282👍, 0💬

Is &&= a valid Java operator?
Is &&= a valid Java operator? No, it is not. 2012-11-29, 2282👍, 0💬

What are wrapper classes?
What are wrapper classes? Java provides specialized classes corresponding to each of the primitive data types. These are called wrapper classes. They are e.g. Integer, Character, Double etc. 2013-05-27, 2280👍, 0💬

What is the main difference between Java platform and other platforms?
What is the main difference between Java platform and other platforms? The Java platform differs from most other platforms in that it's a software-only platform that runs on top of other hardware-based platforms. The Java platform has three elements: Java programming language The Java Virtual Machin... 2013-02-19, 2280👍, 0💬

What is Externalizable?
What is Externalizable? Externalizable is an Interface that extends Serializable Interface. And sends data into Streams in Compressed Format. It has two methods, writeExternal(ObjectOuput out) and readExternal(ObjectInput in) 2013-02-05, 2279👍, 0💬

How to make a class or a bean serializable?
How to make a class or a bean serializable? By implementing either the java.io.Serializable interface, or the java.io.Externalizable interface. As long as one class in a class's inheritance hierarchy implements Serializable or Externalizable, that class is serializable. 2013-04-01, 2278👍, 0💬

How are the elements of a GridLayout organized?
How are the elements of a GridLayout organized? The elements of a GridBad layout are of equal size and are laid out using the squares of a grid. 2013-01-01, 2277👍, 0💬

What is casting?
What is casting? There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, such as double values, to smaller values, such as byte values. Casting between object references is used to ... 2012-12-20, 2277👍, 0💬

What method must be implemented by all threads?
What method must be implemented by all threads? All tasks must implement the run() method, whether they are a subclass of Thread or implement the Runnable interface. 2013-01-29, 2276👍, 0💬

How can one prove that the array is not null but empty using one line of code?
How can one prove that the array is not null but empty using one line of code? Print args.length. It will print 0. That means it is empty. But if it would have been null then it would have thrown a NullPointerException on attempting to print args.length. 2013-05-07, 2275👍, 0💬

How are this and super used?
How are this and super used? this is used to refer to the current object instance. super is used to refer to the variables and methods of the superclass of the current object instance. 2013-01-10, 2274👍, 0💬

When is the finally clause of a try-catch-finally statement executed?
When is the finally clause of a try-catch-finally statement executed? The finally clause of the try-catch-finally statement is always executed unless the thread of execution terminates or an exception occurs within the execution of the finally clause. 2012-12-17, 2274👍, 0💬

What is the difference between error and an exception?
What is the difference between error and an exception? An error is an irrecoverable condition occurring at runtime. Such as OutOfMemory error. These JVM errors and you can not repair them at runtime. While exceptions are conditions that occur because of bad input etc. e.g. FileNotFoundException will... 2013-05-29, 2272👍, 0💬

What is the result in program?
What is the result in program? public class test { public static void main(String [] args) { int x = 3; int y = 1; if (x = y) System.out.println("Not equal"); else System.out.println("Equal"); } } What is the result? A. The output is “Equal” B. The output in “Not Equal” C. An error at "... 2013-03-05, 2271👍, 0💬

Difference between Swing and Awt?
Difference between Swing and Awt? AWT are heavy-weight componenets. Swings are light-weight components. Hence swing works faster than AWT. 2013-04-26, 2270👍, 0💬

What restrictions are placed on method overloading?
What restrictions are placed on method overloading? Two methods may not have the same name and argument list but different return types. 2013-04-01, 2269👍, 0💬

What is a Java package and how is it used?
What is a Java package and how is it used? A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces. Packages are also used to organize related classes and interfaces into a single API unit and to control ac... 2013-01-24, 2267👍, 0💬

What modifiers are allowed for methods in an Interface?
What modifiers are allowed for methods in an Interface? Only public and abstract modifiers are allowed for methods in interfaces. 2013-06-19, 2266👍, 0💬

Can an application have multiple classes having main method?
Can an application have multiple classes having main method? Yes it is possible. While starting the application we mention the class name to be run. The JVM will look for the Main method only in the class whose name you have mentioned. Hence there is not conflict amongst the multiple classes having ... 2013-05-08, 2266👍, 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