-
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.
-
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.
-
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.
-
Dynamic method Dispatch
What is dynamic method dispatch?
-
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...
-
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(); -
Q: What is it object serialization ?
Serialization is a way to convert objects (including complex data structures such as lists and trees) into a stream of bytes.
Sandhya.Kishan
- Jun 11th, 2012
Serialization is a process of conversion of an object to a series of bytes.Such that the object can be stored easily in the persistent memory.The byte stream can then be deserialised i.e,converted into a replica of the original object.
-
Which Component subclass is used for drawing and painting
Canvas
-
What interface must an object implement before it can be written to a streamas an object
An object must implement the Serializable or Externalizable interface before it can bewritten to a stream asan object.
Sandhya.Kishan
- Jun 11th, 2012
Externalizable and serializable interfaces must be implemented by an object before it is written to the stream as an object.
-
What classes of exceptions may be thrown by a throw statement
A throw statement may throw any expression that may be assigned to the Throwabletype.
-
Under what conditions is an object's finalize() method invoked by the garbagecollector
The garbage collector invokes an object's finalize() method when it detects that the objecthas becomeunreachable.
Sandhya.Kishan
- Jun 11th, 2012
When an object has no references then it reaches its unreachable condition and under this condition the finalize() method is invoked by the garbage collector.
-
-
If a variable is declared as private, where may the variable be accessed
A private variable may only be accessed within the class in which it is declared.
Anonymous
- Jun 7th, 2012
I understand your question to be pertaining to private variables w/in a class and not local variables (i.e. variables declared w/in a method). That said, a private variable may be accessed by constru...
Sandhya.Kishan
- Jun 2nd, 2012
The private variables can be accessed only in the block in which they have been declared.
-
What is a compilation unit
A compilation unit is a Java source code file.
Sandhya.Kishan
- Jun 7th, 2012
The source code file for a Java class is called a compilation unit. Normally a compilation unit contains a single class definition and it is named for that class.
-
Which package is always imported by default
The java.lang package is always imported by default.
Sandhya.Kishan
- Jun 7th, 2012
The java,lang package is imported by default as it includes all other packages.
-
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 agrid.
Sandhya.Kishan
- Jun 4th, 2012
The elements of a gridlayout are organized depending on the size and equal size are laid out using the squares of a grid.
-
What event results from the clicking of a button
The ActionEvent event is generated as the result of the clicking of a button.
-
What are E and PI
E is the base of the natural logarithm and PI is mathematical value pi.
Sandhya.Kishan
- Jun 2nd, 2012
E and Pi are mathematical constants where E stands foe natural logarithm and PI stands for a value equal to 3.17
-
What is the highest-level event class of the event-delegation model
The java.util.EventObject class is the highest-level class in the event-delegation classhierarchy.
Sandhya.Kishan
- Jun 2nd, 2012
Java.util.Eventobject is the highest level event class of the event delegation model.
-
Is a class a subclass of itself
A class is a subclass of itself.
Java Interview Questions
Ans