Re: Method calling

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 29 Jul 2008 19:07:38 -0400
Message-ID:
<488fa2b3$1$90270$14726298@news.sunsite.dk>
gaijinco wrote:

Is there a way in Java to call a method by having its name on a
string?

something as:

void foo(){}
void bar(){}

void callFunction(String s)
{
  // Call function s
}

void otherFunction()
{
  callFunction("foo");
}


You can use reflection.

See example below.

Arne

============================================

import java.lang.reflect.*;

public class Refl2 {
     public void m1(String a, String b) {
         System.out.println("m1: " + a + " " + b);
     }
     public void m2(String a, String b) {
         System.out.println("m2: " + a + " " + b);
     }
     public static void c(Object o, String methodName, String a, String b) {
         try {
             Class declarg[] = new Class[2];
             declarg[0] = String.class;
             declarg[1] = String.class;
             Method m = o.getClass().getMethod(methodName, declarg);
             Object callarg[] = new Object[2];
             callarg[0] = a;
             callarg[1] = b;
             m.invoke(o, callarg);
         } catch (Exception e) {
         }
     }
     public static void main(String[] args) {
         Refl2 r = new Refl2();
         r.m1("a", "b");
         r.m2("a", "b");
         c(r, "m1","a", "b");
         c(r, "m2","a", "b");
     }
}

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