how to invoke a Math class function method by string name

Asked Feb 05 '16 at 15:43

Active Feb 05 '16 at 16:03

Viewed 36 times

hey i want to invoke a Math class Method by String variable conatining a method name of Math class i have tested the below code:-

String spfunc="sin";
Method m=Math.class.getMethod(spfunc,double.class);
m.invoke(Math.class, 3.0);

but it resturns an error like this:-

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at EquationSolver.solveEquation(EquationSolver.java:112)
at EquationSolver.substituteValue(EquationSolver.java:94)
at EquationSolver.main(EquationSolver.java:20)

please help me out how to achieve this

edited Feb 05 '16 at 16:03

asked Feb 05 '16 at 15:43

Abhishek Kumar

Could you post the entire stack trace of this error ? – Arnaud Feb 05 '16 at 15:50
this is the only error it shows – Abhishek Kumar Feb 05 '16 at 15:56
call _printStackTrace()_ on the Exception object. – Arnaud Feb 05 '16 at 16:01
1

So the Exception comes from line 112 of your code. The stack shows that the problem comes from an ArrayList index, not from _class.getMethod_ or _method.invoke_ . – Arnaud Feb 05 '16 at 16:10
thanks now it worked – Abhishek Kumar Feb 05 '16 at 16:46

how to invoke a Math class function method by string name

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