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04.15.2008 at 04:37PM PDT, ID: 23325620
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mathematical operations using reflection

Asked by perdoname_ in Java Programming Language

Hello Experts

I need your assistance how can i modify my program in order the single method applyFunctionUsingName()  
to take as a parameter a string with the name of an arbitrary mathematical
method in class Math with a single parameter of type double (e.g., cos or atan).  




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interface NegInterface 
{
	public void applyNeg();
}
 
interface CosInterface
{
	public void applyCos();
}
 
interface SqrtInterface
{
	public void applySqrt();
}
 
interface SinInterface
{
	public void applySin();
}
 
 
 
class MathArray { 
 
	double[] array; 
 
	MathArray(double[] array) { 
 
		this.array = array; 
 
	} 
 
	public void applyFunctionUsingName(int func)
	{
		switch (func)
		{
			case 0:
				applySqrt();
				break;
			case 1:
				applySin();
				break;
			case 2:
				applyCos();
				break;
			default:
				System.out.println("Invalid Option Selected \n Choose 0,1 or 2");
			break;
		}
	}
 
	void warnNaN(double d) { 
 
		if(((Double)d).isNaN()) 
			System.err.println("Warning: result is undefined"); 
 
	} 
 
 
	void applySqrt() { 
 
		for(int i = 0; i < array.length; i++) { 
 
			array[i] = Math.sqrt(array[i]); 
 
			warnNaN(array[i]); 
 
		} 
 
	} 
 
 
	void applySin() { 
 
		for(int i = 0; i < array.length; i++) { 
 
			array[i] = Math.sin(array[i]); 
 
			warnNaN(array[i]); 
 
		} 
 
	} 
 
	void applyCos() { 
 
		for(int i = 0; i < array.length; i++) { 
 
			array[i] = Math.cos(array[i]); 
 
			warnNaN(array[i]); 
 
		} 
 
	} 
 
	void print() { 
 
		for(int i = 0; i < array.length; i++) 
			System.out.print(array[i] + (i < array.length-1?", ":"\n")); 
 
	} 
 
} 
 
public class MathArrayTest { 
 
	public static void main(String[] args) { 
 
		MathArray te = new MathArray(new double[] { 0.1, 2.23, 3.08 });
 
		te.applyFunctionUsingName(Integer.parseInt(args[0]));
 
		te.print();
 
 
	} 
 
}
 
Keywords: mathematical operations using reflection
Title
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[+][-]04.15.2008 at 10:28PM PDT, ID: 21365010

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[+][-]04.15.2008 at 11:02PM PDT, ID: 21365099

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[+][-]04.16.2008 at 12:47AM PDT, ID: 21365565

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About this solution

Zone: Java Programming Language
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Solution Provided By: oleber
Participating Experts: 2
Solution Grade: A
 
 
 
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