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Name four methods every Java class will have.
public String toString();public Object clone();public boolean equals();public int hashCode();
Sandhya.Kishan
- Jun 11th, 2012
Every Java class will have
1.public String toString();
2.public Object clone();
3.public boolean equals();
4.public int hashCode(); -
What is the Set interface
The Set interface provides methods for accessing the elements of a finite mathematicalset. Sets do notallow duplicate elements.
Sandhya.Kishan
- Jun 12th, 2012
The Set interface extends the Collection interface.It contains only methods inherited from Collection interface,some methods are: 1.add( )-Adds an object to the collection. 2.clear( )-Removes all obj...
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Dynamic method Dispatch
What is dynamic method dispatch?
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What is the ResourceBundle class
The ResourceBundle class is used to store locale-specific resources that can be loaded bya program to tailor the program's appearance to the particular locale in which it is beingrun.
Sandhya.Kishan
- Jun 14th, 2012
ResourceBundle is a set of related subclasses that share the same base name.It can be used instead of the Properties class. It is usefull when developing applications for different languages,the ResourceBundle class will find the correct properties file based on the current user locale.
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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 isused to represent the classes and interfaces that are loaded by a Java program..
Sandhya.Kishan
- Jun 14th, 2012
Object class is the super class of all the classes in java.It defines methods which are inherited by all other classes.
Class class defines the behaviours and functionality for the classes in java.It also represent the classes and
interfaces that are loaded by a Java program.
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Can an object be garbage collected while it is still reachable
A reachable object cannot be garbage collected. Only unreachable objects may begarbage collected..
Sandhya.Kishan
- Jun 14th, 2012
No, reachable object cannot be garbage collection ,only when the object becomes unreachable in gets collected in garbage collector.
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Java is Architectural _____________
A) DependentB) NeutralC) IndependentD) None of the above
sudheer
- Jun 15th, 2012
Architectural neutral
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What is the purpose of garbage collection
The purpose of garbage collection is to identify and discard objects that are no longerneeded by a programso that their resources may be reclaimed and reused.
Sandhya.Kishan
- Jun 15th, 2012
The purpose of garbage collection is to remove the unused variables/objects (value is null) from the memory,so that their resources can be reclaimed and reused by other programs.
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What are three ways in which a thread can enter the waiting state
A thread can enter the waiting state by invoking its sleep() method, by blocking on I/O,by unsuccessfullyattempting to acquire an object's lock, or by invoking an object's wait() method. It canalso enter thewaiting state by invoking its (deprecated) suspend() method.
Sandhya.Kishan
- Jun 15th, 2012
The thread can enter its waiting state by
1.invoking its sleep() method
2.By invoking its suspend() method
3.When an i/o block occurs. -
What is the ResourceBundle class
The ResourceBundle class is used to store locale-specific resources that can be loaded bya program totailor the program's appearance to the particular locale in which it is being run.
Sandhya.Kishan
- Jun 15th, 2012
ResourceBundle is a set of related subclasses that share the same base name.It can be used instead of the Properties class. It is useful when developing applications for different languages,the Resour...
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How to kill a thread?
Sandhya.Kishan
- Jun 19th, 2012
The Thread.stop() method can be used to kill a thread but it is unsafe and thus deprecated.
Other way would be to have a variable indicating if the thread should be stopped. Other threads may set the variable to make the thread stop. Then, the thread itself may clean up and stop. -
If service method is used then doGet() and doPost() stand for what?
Sandhya.Kishan
- Jun 19th, 2012
We use doGet() when you want to intercept on HTTP GET requests.The servlet doGet() is used to preprocess a request.Ex:doing some business stuff before displaying the JSP page, such as gathering data f...
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Can u read all elements from an array?
Sandhya.Kishan
- Jun 19th, 2012
Reading elements from an array depends on the type of data that we want to read from an array,if the array is a linked list or stack or a queue it is not possible to read all the elements but if the array is fo a prmitive data typr then it is possible to read all the elements,
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Can an object's finalize() method be invoked while it is reachable
An object's finalize() method cannot be invoked by the garbage collector while the objectis still reachable.However, an object's finalize() method may be invoked by other objects.
Sandhya.Kishan
- Jun 19th, 2012
The reachable objects cannot be garbage collected and hence an objects finalize() method cannot be invoked while it is reachable.
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How are this and super used
This is used to refer to the current object instance. super is used to refer to the variablesand methods of thesuperclass of the current object instance.
Sandhya.Kishan
- Jun 23rd, 2012
This() is used to refer the class scope variables. and method scope variables and it is used to invoke a constructor of the same class.
super() is used to refer super-class member and subclass member and it invoke a super-class constructor. -
What happens if an exception is not caught
An uncaught exception results in the uncaughtException() method of the thread'sThreadGroup beinginvoked, which eventually results in the termination of the program in which it is thrown.
Sandhya.Kishan
- Jun 23rd, 2012
If the exception is not caught by any of the method in the methods stack , then the main method throws that exception and the JVM halts its execution.
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What is binding in Java ?
Rohit Verma
- Jun 24th, 2012
Binding in java is between an object and its methods/variables. It can happen either at compile time( method overloading / normal call ) or at run time ( method override ).
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Encapsulation and data abstraction in Java
Can somebody tell me what is the example of encapsulation , data abstraction & polymorphism?
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What can a method do with a checked exception?
Sandhya.Kishan
- Jul 13th, 2012
With a checked exception a method can either throw an exception to the method which calls it or it can handek the exception in the catch block.
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Which swing components are synchronized?
Sandhya.Kishan
- Jul 13th, 2012
The repaint(), revalidate(), and invalidate() methods are synchronised.
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