Trouble in dynamic method invocation

Question

hai forum,
Your previous responses on this topic 'method invocation' has greatly helped me in writing a code to invoke method dynamically.As some experts pointed out,the parameters had to be type casted.
Please help me out of my latest trouble.I invoke only a particular method 'methodName' of a particular calss instance 'instance'.But when i run the code Exceptions are thrown for all the methods of that class whereas i require exceptions connected with "methodName" only.
I just could not figure out my mistake, so please help me out.
Thank you.
    private class MethodInvoke implements ActionListener
        private String methodName=""; //name of the method
        Object instance;                          //instance of the class
        private int paraNum=0;             //num of parameters
        public void setParameters(String methodName,Object instance,int paraNum)
            this.methodName = methodName;
            this.instance=instance;
            this.paraNum=paraNum;
        public void actionPerformed(ActionEvent e)
             try
                       //TAKE PARAMETERS FROM USER USING TEXTFIELDS INTO AN ARRAY LIST
                    Component[] cList = textfieldPanel.getComponents();
                    ArrayList parameterList = new ArrayList(paraNum);
                    Object[] parameters = new Object[parameterList.size()];
                     for (int x = 0; x < paraNum; x++)
                            if (cList[x] instanceof JTextField)
                                String value = ((JTextField) cList[x]).getText(); 
                                parameterList.add(value);
                    Method[] allMethods = instance.getClass().getMethods();
                    Method method = null;
                    for (int i = 0; i < allMethods.length; i++)
                            if (allMethods.getName().equals(methodName))
method = allMethods[i];
break;
if (method == null)
throw new RuntimeException("Method not found");
Class[] types = method.getParameterTypes();
for (int i = 0; i < paraNum; i++)
String values = (String)parameterList.get(i);
if (types[i].equals(Integer.class))
parameters[i] = new Integer(values);
else if (types[i].equals(Long.class))
parameters[i] = new Long(values);
else if (types[i].equals(String.class))
parameters[i] = values;
else if (types[i].equals(Float.class))
parameters[i]=new Float(values);
else if (types[i].equals(Boolean.class))
parameters[i]=new Boolean(values);
else
System.out.println("Do not support the data type");
Object result = method.invoke(instance, parameters);
System.out.println("Invoked result: " + result);
catch(Exception e3)
System.out.println(e3);

Answer 1

This is the Emp class which iam calling.Hope this will help you.
import java.io.*;
public class Emp
     private String designation;
     private int salary;
     private int id;
     private String name;
     public Emp()
     public void setId(int i)
          id=i;
     public int getId()
          return id;
     public void setDesignation(String d)
          designation=d;
     public void setName(String d)
          name=d;
     public void setSalary(int s)
          salary=s;
     public String getDesignation()
          return designation;
     public int getSalary()
          return salary;
     public String getName()
          return name;
     public void setAll()
          try
               System.out.println("Enter name:");
               BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
               String n=br.readLine();
               setName(n);
               System.out.println("Enter ID:");
               setId(Integer.parseInt(br.readLine()));
               System.out.println("Enter Designation:");
               n=br.readLine();
               setDesignation(n);
               //System.out.println("Enter Salary:");
               //setSalary(Integer.parseInt(br.readLine()));
          catch(Exception e)
     public void getAll()
          System.out.println("Name: "+getName()+"\n ID: "+getId()+
                    "\n Designation: "+getDesignation());
     public void pay(int w)
          getAll();
          System.out.println("Name: "+name+"\nAmount to be paid : "+w);
     /*public static void main(String[] args)
          Emp e=new Emp();
          e.setAll();
          e.getAll();
}