Function evaluation

Question

Hello,
I'm facing a challenge task to do function evaluation in java. I need to write a function which take a string and a 2D array like following:
public double[][] loopEval(String input, double[][] data)
then, I need to parse the String based on following rule, the string is composed as a class name, a "." and a function name. For e.g., the string could be "Math.round". So each element of the 2D array should be applied by using this funciton( e.g., Math.round(data[ i ][ j ] ) in the loop. The input string could be various Class and function.
Hope you could give help on solving this problem? many thanks.

Answer 1

Thanks for the reply. But I still struggled with this problem. Please see the following code snippet:
   public double[][] loopEval(String className, String methodName, Matrix aMatrix){
    double[][] inData = aMatrix.getArray();
    int rowNum = inData.length;                    //the number of rows
    int colNum = inData[0].length;                 //the number of cols
    double[][] outData = new double[rowNum][colNum]; //assume colNum are same
    Class c = null;
    Method m = null;
    try{
      c = Class.forName(className);
      m = c.getMethod(methodName, null);
      //loop each element and apply the specific function
      for (int i = 0; i < rowNum; i++) {
        for (int j = 0; j < colNum; j++) {
          Float[] arg = new Float[1];
          arg[0] = new Float(inData[i][j]);
          outData[i][j] = ((Double)m.invoke(c, arg)).doubleValue();
    catch(Exception e){
      e.printStackTrace();
  return outData;
}method call is like following:
  double[][] roundResult = util.loopEval("java.lang.Math", "round", A);I got error like this:
java.lang.NoSuchMethodException: java.lang.Math.round()
I know the "round" method should take one parameter, but how could I solve the problem in this case?
thanks!