Is there any alternative for the parameterized constructor

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Java

Hi All,
I have to do performance testing.for that I have created one script in that I have to pass respective method name against which i have to do performance testing.
i have all the methods provided in the another test class.
and test class should have exactly one zero-argument constructor. This is the scenario.
problem is, whenever I try to pass that method name in the perftestclass it gives me an error like "create parameterized constructor to initialize it. And it is absolutely right.
but my testclass doesn't allow me to create a paramaterized constructor.
So my question is, is there any alternative for this?
please reply if anybody has solution...
Thank you...