-
Does garbage collection guarantee that a program will not run out of memory
Garbage collection does not guarantee that a program will not run out of memory. It ispossible forprograms to use up memory resources faster than they are garbage collected. It is alsopossible forprograms to create objects that are not subject to garbage collection
Sandhya.Kishan
- Jul 26th, 2012
The garbage collection is JVM dependent then It is possible for programs to use memory resources faster than they are garbage collected.Moreover garbage collection cannot be enforced,it is just sugges...
-
What restrictions are placed on the location of a package statement within asource code file
A package statement must appear as the first line in a source code file (excluding blanklines andcomments).
Sandhya.Kishan
- Jun 2nd, 2012
The restriction on the location of the package statement is that it should appear as the first line with in a source code file.
-
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.
-
What is the immediate superclass of the Applet class
Panel
-
Name three Component subclasses that support painting
The Canvas, Frame, Panel, and Applet classes support painting.
Sandhya.Kishan
- Apr 28th, 2012
Canvas class, frame class and applet class are the subclasses that support painting.
-
What value does readLine() return when it has reached the end of a file
The readLine() method returns null when it has reached the end of a file.
Sandhya.Kishan
- May 4th, 2012
The readline() method returns null when it reaches the end of the line.
-
What is the immediate superclass of the Dialog class
Window
-
What is clipping
Clipping is the process of confining paint operations to a limited area or shape.
Sandhya.Kishan
- Apr 24th, 2012
Confining the areas of paint to a limited shape and size is known as clipping.
-
What is a native method
A native method is a method that is implemented in a language other than Java.
-
Can a for statement loop indefinitely
Yes, a for statement can loop indefinitely. For example, consider the following:for(;;) ;
Sandhya.Kishan
- Apr 24th, 2012
For(i=0::)
{
}
Tis is an example where the for loop runs indefinitely. -
When a thread blocks on I/O, what state does it enter
A thread enters the waiting state when it blocks on I/O.
Sandhya.Kishan
- Apr 14th, 2012
The thread enters a blocked state when it is blocked on i/o,and hence it waits for the resources which is held by other thread and then it enters the running state where the thread gets executed.
-
To what value is a variable of the String type automatically initialized
The default value of an String type is null.
Sandhya.Kishan
- Apr 20th, 2012
Null value is the default value to which the string type is automatically initilised.
-
What is the catch or declare rule for method declarations
If a checked exception may be thrown within the body of a method, the method musteither catch theexception or declare it in its throws clause.
Sandhya.Kishan
- Jul 26th, 2012
The catch or declare rule states that if a checked exception is be thrown within the body of a method, the method must either catch the exception or declare it in its throws clause.
-
What class is the top of the AWT event hierarchy
The java.awt.AWTEvent class is the highest-level class in the AWT event-classhierarchy.
Sandhya.Kishan
- Apr 14th, 2012
The AWT event hierarchy is
java.lang.object ----> java.util.Eventobject ----> java.awt.AWTevent ----> java.awt.event.Hierarchyevent. -
When a thread is created and started, what is its initial state
A thread is in the ready state after it has been created and started.
-
Can an anonymous class be declared as implementing an interface andextending a class
An anonymous class may implement an interface or extend a superclass, but may not bedeclared to doboth.
Sandhya.Kishan
- May 11th, 2012
An anonymous class simultaneously cannot be declared as implementing an interface and extending a class but it may implement an interface or extend a superclass.
-
What is the range of the short type
The range of the short type is -(2^15) to 2^15 - 1.
Sandhya.Kishan
- Apr 14th, 2012
The range of short data type is 32,768 to 32,767 and it uses 2 bytes to store a particular value or a number.
-
What is the immediate superclass of Menu
MenuItem
-
What is the purpose of finalization
The purpose of finalization is to give an unreachable object the opportunity to performany cleanupprocessing before the object is garbage collected.
Sandhya.Kishan
- Jul 24th, 2012
The purpose of finalization is to provide opportunity to an object which is unreachable to perform any cleanup process . This activity is done before the object is garbage collected.Finalization is used to invoke finalized() method
-
Which class is the immediate superclass of the MenuComponent class
Object
Java Interview Questions
Ans