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Casting it to the base class will get met acess to the abstract method calculate?<br />

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Casting it to the base class will get met acess to the abstract method calculate?


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Dear Expert:<br />
<br />
I'm new to java.<br />
<br />
I have an abstract class A, with an abstract method &quot;calculate()&quot;.<br />
I extend from A, classes B, C, and D. &nbsp;The all implement &quot;calculate()&quot; differently.<br />
I then put these classes as values into a MAP.<br />
When I try to access the calculate() method using the .get method of the MAP, &nbsp;the compiler says that there is not calculate() method. &nbsp; &nbsp;&quot;foo.get(&quot;add&quot;).calculate(<wbr />)&quot;<br />
<br />
How do I polymorphically get at the calculate method?<br />
<br />
Any simple examples out there?<br />
<br />
Thanks
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Dear Expert:

I'm new to java.

I have an abstract class A, with an abstract method "calculate()".
I extend from A, classes B, C, and D.  The all implement "calculate()" differently.
I then put these classes as values into a MAP.
When I try to access the calculate() method using the .get method of the MAP,  the compiler says that there is not calculate() method.    "foo.get("add").calculate()"

How do I polymorphically get at the calculate method?

Any simple examples out there?

Thanks

How to access an abstract method

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.