Author: Real Gagnon
Author's WebSite: http://tactika.com/realhome/realhome.html

Given the class name and function name, call function using reflection API.

 import java.lang.reflect.*;
 import java.io.*;

 public class testReflect {
    public static void main(String s[]) {
       testReflect t = new testReflect();
       try {
          t.doit();
          }
       catch (Exception e) {
          e.printStackTrace();
          }
       }
    public void doit() throws Exception {
       String aClass;
       String aMethod;   
       // we assume that called methods have no argument
       Class params[] = {};
       Object paramsObj[] = {};
       
       while (true) {
          /* examples 
             Class: class1         Method: class1Method2
             Class: java.util.Date Method: toString
             Class: java.util.Date Method: getTime
          */
          aClass  = Input.Line("\nClass : ");
          aMethod = Input.Line("Method: ");
          // get the Class
          Class thisClass = Class.forName(aClass);
          // get an instance 
          Object iClass = thisClass.newInstance();
          // get the method
          Method thisMethod = thisClass.getDeclaredMethod(aMethod, params);
          // call the method
          System.out.println(thisMethod.invoke(iClass, paramsObj).toString());
          }
       }
    
    static class Input {
      public static String Line(String s) throws IOException {
          BufferedReader input = 
              new BufferedReader(new InputStreamReader(System.in));
          System.out.print(s);
          return input.readLine();     
         }
      }
 }

 class class1 {
    public String class1method1() {
       return "*** Class 1, Method1 ***";
       }
    public String class1method2() {
       return "### Class 1, Method2 ###";
       }
    }

Posted On: 4-Jul-1999