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Name three subclasses of the Component class.
Name three subclasses of the Component class. Box.Filler, Button, Canvas, Checkbox, Choice, Container, Label, List, Scrollbar, or TextComponent 2012-10-19, 2367👍, 0💬

How does multithreading take place on a computer with a single CPU?
How does multithreading take place on a computer with a single CPU? The operating system's task scheduler allocates execution time to multiple tasks. By quickly switching between executing tasks, it creates the impression that tasks execute sequentially. 2012-12-14, 2366👍, 0💬

What is the difference between the paint() and repaint() methods?
What is the difference between the paint() and repaint() methods? The paint() method supports painting via a Graphics object. The repaint() method is used to cause paint() to be invoked by the AWT painting thread. 2012-12-12, 2366👍, 0💬

Which class should you use to obtain design information about an object?
Which class should you use to obtain design information about an object? The Class class is used to obtain information about an object's design. 2012-11-30, 2366👍, 0💬

What is a platform?
What is a platform? A platform is the hardware or software environment in which a program runs. Most platforms can be described as a combination of the operating system and hardware, like Windows 2000 and XP, Linux, Solaris, and MacOS. 2013-03-29, 2365👍, 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, 2360👍, 0💬

What is the Java Virtual Machine?
What is the Java Virtual Machine? The Java Virtual Machine is a software that can be ported onto various hardware-based platforms. 2013-02-20, 2360👍, 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, 2360👍, 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, 2359👍, 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, 2357👍, 0💬

Which package is always imported by default?
Which package is always imported by default? The java.lang package is always imported by default. 2013-01-09, 2357👍, 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, 2356👍, 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, 2356👍, 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, 2355👍, 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, 2354👍, 0💬

What are Checked and UnChecked Exception?
What are Checked and UnChecked Exception? A checked exception is some subclass of Exception (or Exception itself), excluding class RuntimeException and its subclasses. Making an exception checked forces client programmers to deal with the possibility that the exception will be thrown. eg, IOExceptio... 2013-05-10, 2354👍, 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, 2354👍, 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, 2354👍, 0💬

What does it mean that a method or field is "static"?
What does it mean that a method or field is "static"? Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all in... 2013-02-11, 2354👍, 0💬

Difference between Vector and ArrayList?
Difference between Vector and ArrayList? Vector is synchronized whereas arraylist is not. 2013-04-26, 2353👍, 0💬

Does Java pass by Value or reference?
Does Java pass by Value or reference? Its uses Reference while manipulating objects but pass by value when sending method arguments. Those who feel why I added this simple question in this section while claiming to be maintaining only strong and interesting questions, go ahead and answer following q... 2013-03-20, 2352👍, 0💬

What is Service Locator pattern?
What is Service Locator pattern? The Service Locator pattern locates J2EE (Java 2 Platform, Enterprise Edition) services for clients and thus abstracts the complexity of network operation and J2EE service lookup as EJB (Enterprise JavaBean) Home and JMS (Java Message Service) component factories. Th... 2013-03-14, 2352👍, 0💬

What is a local, member and a class variable?
What is a local, member and a class variable? Variables declared within a method are "local" variables. Variables declared within the class i.e not within any methods are "member" variables (global variables). Variables declared within the class i.e not within any methods and are defined as "static"... 2013-02-06, 2352👍, 0💬

What interface is extended by AWT event listeners?
What interface is extended by AWT event listeners? All AWT event listeners extend the java.util.EventListener interface. 2013-01-14, 2352👍, 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