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What classes of exceptions may be thrown by a throw statement?
What classes of exceptions may be thrown by a throw statement? A throw statement may throw any expression that may be assigned to the Throwable type. 2013-01-03, 2197👍, 0💬

Explain garbage collection?
Explain garbage collection? Garbage collection is one of the most important feature of Java. Garbage collection is also called automatic memory management as JVM automatically removes the unused variables/objects (value is null) from the memory. User program cann't directly free the object from memo... 2013-02-26, 2196👍, 0💬

When does the compiler supply a default constructor for a class?
When does the compiler supply a default constructor for a class? The compiler supplies a default constructor for a class if no other constructors are provided. 2012-12-14, 2196👍, 0💬

What are class members and Instance members?
What are class members and Instance members? Any global members(Variables, methods etc.) which are static are called as Class level members and those which are non-static are called as Instance level members. 2013-03-19, 2195👍, 0💬

Do I need to import java.lang package any time? Why ?
Do I need to import java.lang package any time? Why ? No. It is by default loaded internally by the JVM. 2013-05-09, 2193👍, 0💬

Objects are passed by value or by reference?
Objects are passed by value or by reference? Java only supports pass by value. With objects, the object reference itself is passed by value and so both the original reference and parameter copy both refer to the same object . 2013-05-17, 2192👍, 0💬

What will be the output on executing the following code .
What will be the output on executing the following code . What will be the output on executing the following code. public class MyClass { public static void main (String args[] ) { int abc[] = new int [5]; System.out.println(abc); } } A Error array not initialized B 5 C null D Print some junk charac... 2013-03-08, 2189👍, 0💬

Under what conditions is an object's finalize() method invoked by the garbage collector?
Under what conditions is an object's finalize() method invoked by the garbage collector? The garbage collector invokes an object's finalize() method when it detects that the object has become unreachable. 2012-12-26, 2188👍, 0💬

Use the Externalizable interface when you need complete control over your Bean's serialization (for example, when writing and r
Use the Externalizable interface when you need complete control over your Bean's serialization (for example, when writing and reading a specific file format). No. Earlier order is maintained. 2013-03-08, 2187👍, 0💬

Can an unreachable object become reachable again?
Can an unreachable object become reachable again? An unreachable object may become reachable again. This can happen when the object's finalize() method is invoked and the object performs an operation which causes it to become accessible to reachable objects. 2013-06-17, 2186👍, 0💬

What is the difference between a field variable and a local variable?
What is the difference between a field variable and a local variable? A field variable is a variable that is declared as a member of a class. A local variable is a variable that is declared local to a method. 2012-12-25, 2182👍, 0💬

How you can force the garbage collection?
How you can force the garbage collection? Garbage collection automatic process and can't be forced. 2013-02-27, 2181👍, 0💬

Name four Container classes.
Name four Container classes. Window, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane 2012-12-21, 2180👍, 0💬

What methods are used to get and set the text label displayed by a Button object?
What methods are used to get and set the text label displayed by a Button object? getLabel() and setLabel() 2013-01-30, 2177👍, 0💬

What is OOPS?
What is OOPS? OOP is the common abbreviation for Object-Oriented Programming. 2013-02-27, 2176👍, 0💬

How is static Synchronization different form non-static synchronization?
How is static Synchronization different form non-static synchronization? When Synchronization is applied on a static Member or a static block, the lock is performed on the Class and not on the Object, while in the case of a Non-static block/member, lock is applied on the Object and not on class. [Tr... 2013-03-19, 2171👍, 0💬

How can we make a class Singleton
How can we make a class Singleton A) If the class is Serializable class Singleton implements Serializable { private static Singleton instance; private Singleton() { } public static synchronized Singleton getInstance() { if (instance == null) instance = new Singleton(); return instance; } /** If the ... 2013-03-18, 2171👍, 0💬

Why can't I say just abs() or sin() instead of Math.abs() and Math.sin()?
Why can't I say just abs() or sin() instead of Math.abs() and Math.sin()? The import statement does not bring methods into your local name space. It lets you abbreviate class names, but not get rid of them altogether. That's just the way it works, you'll get used to it. It's really a lot safer this ... 2013-02-15, 2169👍, 0💬

What is a Throughput Collector?
What is a Throughput Collector? The throughput collector is a generational collector similar to the default collector but with multiple threads used to do the minor collection. The major collections are essentially the same as with the default collector. By default on a host with N CPUs, the through... 2013-03-25, 2167👍, 0💬

What is the difference between a constructor and a method?
What is the difference between a constructor and a method? A constructor is a member function of a class that is used to create objects of that class. It has the same name as the class itself, has no return type, and is invoked using the new operator. A method is an ordinary member function of a cla... 2013-04-29, 2166👍, 0💬

What are the two basic ways in which classes that can be run as threads may be defined?
What are the two basic ways in which classes that can be run as threads may be defined? A thread class may be declared as a subclass of Thread, or it may implement the Runnable interface. 2013-01-31, 2166👍, 0💬

What are different types of inner classes?
What are different types of inner classes? Nested top-level classes, Member classes, Local classes, Anonymous classes Nested top-level classes- If you declare a class within a class and specify the static modifier, the compiler treats the class just like any other top-level class. Any class outside ... 2013-05-13, 2165👍, 0💬

What will be the output on executing the following code...
What will be the output on executing the following code... What will be the output on executing the following code. public class MyClass { public static void main (String args[] ) { int abc[] = new int [5]; System.out.println(abc[0]); } } A Error array not initialized B 5 C 0 D Print some junk chara... 2013-03-11, 2163👍, 0💬

How are this() and super() used with constructors?
How are this() and super() used with constructors? This() is used to invoke a constructor of the same class. super() is used to invoke a superclass constructor. 2013-06-13, 2161👍, 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