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Why are the methods of the Math class static
So they can be invoked as if they are a mathematical code library.
Sandhya.Kishan
- Jun 1st, 2012
Math class contains methods used for mathematical calculations since they do not depend on instance data to perform their job and hence they are static.
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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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What is the purpose of the Runtime class
The purpose of the Runtime class is to provide access to the Java runtime system.
Sandhya.Kishan
- Jun 2nd, 2012
The runtime class provides access to the java runtime system, it provides runtime information memory availability, invoking the garbage collector.It provides facilities such as Reading data through key board,Running non-java programs from within a java application etc.
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What method is invoked to cause an object to begin executing as a separatethread
The start() method of the Thread class is invoked to cause an object to begin executing asa separate thread.
Sandhya.Kishan
- Jun 2nd, 2012
To cause an object to begin executing as a separate thread we should invoke the start() method present in the thread class.
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How are the elements of a BorderLayout organized
The elements of a BorderLayout are organized at the borders (North, South, East, andWest) and the centerof a container.
Sandhya.Kishan
- Jun 2nd, 2012
The elements of a borderlayout are organized in the center and at the borders of the container.
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Which class is extended by all other classes
The Object class is extended by all other classes.
Sandhya.Kishan
- Jun 2nd, 2012
The object class is the super class of each and every class and henae it is extended by all other classes.
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Is a class a subclass of itself
A class is a subclass of itself.
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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.
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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
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What event results from the clicking of a button
The ActionEvent event is generated as the result of the clicking of a button.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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Which Component subclass is used for drawing and painting
Canvas
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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.
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