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What is an Iterator interface
The Iterator interface is used to step through the elements of a Collection.
Sandhya.Kishan
- Apr 10th, 2012
The Iterator interface lets you step through the objects that a collection contains.
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What is the difference between the >> and >>> operators
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that havebeen shifted out.
Sandhya.Kishan
- Apr 13th, 2012
>> and >>> are both shifting operators.
>> shifting operator carries the sign when a number is being shifted right.
>>> shifting operator fills the spaces with zero for a number which is been shifted right. -
Which method of the Component class is used to set the position and size of acomponent
setBounds()
Sandhya.Kishan
- Apr 13th, 2012
The method which is used to set position and size of a component is setBound() method present in the component class.
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What is the difference between yielding and sleeping
When a task invokes its yield() method, it returns to the ready state. When a task invokesits sleep()method, it returns to the waiting state.
jimmy514in
- May 18th, 2010
On yielding it returns to Running state.On sleeping, it returns to wait state.
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Is sizeof a keyword
The sizeof operator is not a keyword.
Sandhya.Kishan
- Apr 13th, 2012
Sizeof is not a keyword but it is an unary operator which is used to calculate the size of datatype, which is measured in terms of bytes.
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What are wrapped classes
Wrapped classes are classes that allow primitive types to be accessed as objects.
Sandhya.Kishan
- Apr 24th, 2012
Wrapped class is a private class defined with other class.The values once assigned in this class cannot be changed.It converts value of one data typr to other data type.
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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...
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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.
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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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What is the immediate superclass of the Applet class
Panel
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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.
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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.
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What is the immediate superclass of the Dialog class
Window
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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.
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What is a native method
A native method is a method that is implemented in a language other than Java.
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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.
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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.
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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.
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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.
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