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mkalaiyarasan
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Fri Aug 28, 2009 4:20 pm
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Post subject: Objects 
What is an object?
Create objects with the new keyword followed by a constructor. For example, the following program creates a TwoDPoint object and prints its fields:
class OriginPrinter {
public static void main(String[] args) {
TwoDPoint origin; // only declares, does not allocate
// The constructor allocates and usually initializes the object
origin = new TwoDPoint();
// set the fields
origin.x = 0.0;
origin.y = 0.0;
// print the two-d point
System.out.println(
"The origin is at " + origin.x + ", " + origin.y);
} // end main
} // end OriginPrinter
The . is the member access separator.
A constructor invocation with new is required to allocate an object. There is no C++ like static allocation.
To compile this class, put it in a file called OriginPrinter.java in the same directory as TwoDPoint.java and type:
$ javac OriginPrinter.java
What does this produce?
Is this a complete program now? Can you run it?
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