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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. 2012-07-20, 2649👍, 0💬

If a class is declared without any access modifiers, where may the class be accessed?
If a class is declared without any access modifiers, where may the class be accessed? A class that is declared without any access modifiers is said to have package or friendly access. This means that the class can only be accessed by other classes and interfaces that are defined within the same pack... 2012-07-19, 2763👍, 0💬

What is the difference between throw and throws keywords?
What is the difference between throw and throws keywords? The throw keyword denotes a statement that causes an exception to be initiated. It takes the Exception object to be thrown as argument. The exception will be caught by an immediately encompassing try-catch construction or propagated further u... 2012-07-19, 2818👍, 0💬

What classes of exceptions may be caught by a catch clause?
What classes of exceptions may be caught by a catch clause? A catch clause can catch any exception that may be assigned to the Throwable type. This includes the Error and Exception types. 2012-07-18, 3186👍, 0💬

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy? The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented. 2012-07-18, 4622👍, 0💬

What is the difference between the Font and FontMetrics classes?
What is the difference between the Font and FontMetrics classes? The FontMetrics class is used to define implementation-specific properties, such as ascent and descent, of a Font object 2012-07-17, 2706👍, 0💬

What are peerless components?
What are peerless components? The peerless components are called light weight components. 2012-07-17, 3609👍, 0💬

Which package has light weight components?
Which package has light weight components? javax.Swing package. All components in Swing, except JApplet, JDialog, JFrame and JWindow are lightweight components. 2012-07-16, 3378👍, 0💬

What is the difference between a Window and a Frame?
What is the difference between a Window and a Frame? Heavy weight components like Abstract Window Toolkit (AWT), depend on the local windowing toolkit. For example, java.awt.Button is a heavy weight component, when it is running on the Java platform for Unix platform, it maps to a real Motif button.... 2012-07-16, 2717👍, 0💬

What is the difference between a Window and a Frame?
What is the difference between a Window and a Frame? The Frame class extends Window to define a main application window that can have a menu bar. 2012-07-13, 2534👍, 0💬

When can an object reference be cast to an interface reference?
When can an object reference be cast to an interface reference? An object reference can be cast to an interface reference when the object implements the referenced interface. 2012-07-13, 2512👍, 0💬

What is an object's lock and which object's have locks?
What is an object's lock and which object's have locks? An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have loc... 2012-07-12, 2957👍, 0💬

What is the difference between a static and a non-static inner class?
What is the difference between a static and a non-static inner class? A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances. 2012-07-12, 3645👍, 0💬

What is a protected method?
What is a protected method? A protected method is a method that can be accessed by any method in its package and inherited by any subclass of its class. 2012-07-11, 2636👍, 0💬

What is a static method?
What is a static method? A static method is a method that belongs to the class rather than any object of the class and doesn't apply to an object or even require that any objects of the class have been instantiated. 2012-07-11, 2649👍, 0💬

What is the difference between interface and abstract class?
What is the difference between interface and abstract class? interface contains methods that must be abstract; abstract class may contain concrete methods. interface contains variables that must be static and final; abstract class may contain non-final and final variables. members in an interface ar... 2012-07-10, 2680👍, 0💬

What is an abstract method?
What is an abstract method? An abstract method is a method whose implementation is deferred to a subclass. Or, a method that has no implementation. 2012-07-10, 2609👍, 0💬

What is the Locale class?
What is the Locale class? The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region. 2012-07-09, 2610👍, 0💬

What is the purpose of the finally clause of a try-catch-finally statement?
What is the purpose of the finally clause of a try-catch-finally statement? The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught. 2012-07-09, 2558👍, 0💬

What is the purpose of the System class?
What is the purpose of the System class? The purpose of the System class is to provide access to system resources. 2012-07-07, 2602👍, 0💬

What is the purpose of the Runtime class?
What is the purpose of the Runtime class? The purpose of the Runtime class is to provide access to the Java runtime system. 2012-07-07, 2637👍, 0💬

What is the Properties class?
What is the Properties class? The properties class is a subclass of Hashtable that can be read from or written to a stream. It also provides the capability to specify a set of default values to be used. 2012-07-05, 2659👍, 0💬

How can a subclass call a method or a constructor defined in a superclass?
How can a subclass call a method or a constructor defined in a superclass? Use the following syntax: super.myMethod(); To call a constructor of the superclass, just write super(); in the first line of the subclass's constructor. 2012-07-05, 2565👍, 0💬

What is the SimpleTimeZone class?
What is the SimpleTimeZone class? The SimpleTimeZone class provides support for a Gregorian calendar. 2012-07-04, 2449👍, 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