Interface in java - an error in an example program

[j_arif123]

Please help me to clear this error:
E:\java\somas\chapter9\workedprog>javac Prob91.java
Prob91.java:11: error: Hysin is not abstract and does not override abstract method Hypfun(double) in Hyper class Hysin implements Hyper {
^
1 error
i am using jdk1.7.

/* Problem 9.1 , Page : 156 - 158.
    Write an interface called Hyperbolic with a method to find either Cosh or Sinh.
	Implement this interface to calculate Sinh(x) and Cosh(x) given by:
	Sinh(x) = x + ( 10 sumE n=1 ( (x^(2n + 1))/ (2n + 1)!
	Cosh(x) = 1 + ( 10 sumE n=1 ( (x^(2n))/ (2n)!
 */
 interface Hyper	{
	final int n = 10;
	double Hypfun(double x);
 }
 class Hysin implements Hyper	{
	double sinh;
	long factn;
	int i;
	long Factfun(int nmax)	{
		long fact = 1;
		for(i=2; i <= nmax; i++)	{
			fact *= i;
			return fact;
		}
	}
	public double Hypnfun(double x)	{
		sinh = x;
		for(int k = 1; k <= n; k++)	{
			factn = Factfun(2 * k + 1);
			sinh = sinh + Math.pow(x,( 2 * k + 1)) / factn;
		}
		return sinh;
	}
 }
 class Hycos implements Hyper	{
	double cosh;
	long factn;
	int i;
	long Factfun(int max)	{
		long fact = 1;
		for(i =2; i <= max ; i++)
			fact *= 1;
		return fact;
	}
	public double Hypfun(double x)	{
		cosh = 1;
		for(int k = 1; k <= x; k++)	{
			factn = Factfun(2 * k);
			cosh = cosh + Math.pow(x, (2 * k)) / factn;
		}
		return cosh;
	}
 }
 class Prob91	{
	public static void main(String args[])	{
		double x, sinh, cosh, jsh, jch;
		Hyper hcos;
		Hyper hsin;
		int pn = 50;
		for(int i = 0; i < pn ; i++)
			System.out.println("-");
		System.out.println("\n");
		System.out.println("x \t sinh \t cosh \t");
		for(int i = 0; i < pn ; i++)
			System.out.println("-");
		System.out.println("\n");
			for(x = 0; x <= 5; )	{
				hsin = new Hysin();
				hcos = new Hycos();
				sinh = hsin.Hypfun(x);
				cosh = hcos.Hypfun(x);
				// Reduce the fractional digits for display
				double sx = (int)(sinh * 1000);
				double cx = (int)(cosh * 1000);
				sinh = sx / 1000;
				cosh = cx / 1000;
				System.out.println(x + "\t" + sinh + "\t" + cosh);
				x += 0.5;
			}
			for(int i = 0; i < pn; i++)
				System.out.print("-");
			System.out.println("\n");
		
			
	}
 }

[Eranga]

Did you read the error message properly?

[Eranga]

Check the class access modifier where you want to implement your interface.

[j_arif123]

Did you read the error message properly?

ya , i pasted the error message as it was shown in the console.

[j_arif123]

The message shows error on line number 11 where i think all are correct . i will check those modifiers...

[Eranga]

Because your class has default access.

[DarrylBurke]

Your code is difficult to follow because you have not adopted standard coding conventions. Method (and variable) names should start with a lowercase letter.

db

[Tolls]

In the interface:
double Hypfun(double x);

In the class implementing the interface:
public double Hypnfun(double x)

They're not the same...

[JosAH]

The name is 'Hypfun', not 'Hypnfun' in yout Hysin class ...

kind regards,

Jos

edit: *darn* too slow again ... ;-)

[Tolls]

Only by an hour.
:)

[JosAH]

Only by an hour.
:)

Oh well, it's improving ;-) (I should refresh the page more and not wait before I want to reply)

kind regards,

Jos

[Tolls]

I do that.
Open a load of thread pages and then do some work occasionally dipping in...only to find someone has answered in the intervening time.

The other classic is to completely miss the fact that the thread has gone onto a second (or more) page...

[JosAH]

I do that.
Open a load of thread pages and then do some work occasionally dipping in...only to find someone has answered in the intervening time.

The other classic is to completely miss the fact that the thread has gone onto a second (or more) page...

Well, you still do it faster than I do it ;-) I do too many things at the same time and I get distracted easily ;-)

kind regards,

Jos

[Tolls]

"ooh look. Shiny things!"
:)

[JosAH]

"ooh look. Shiny things!"
:)

We want to hear typing sounds mr. Tolls! Stop chasing that poor little butterfly and get off that desk and sit down!

kindest regards,

Jos ;-)

[j_arif123]

Your code is difficult to follow because you have not adopted standard coding conventions. Method (and variable) names should start with a lowercase letter.

db

i will try to code according to the conventions. Thanks..