How get public methods of a java class and then run it?

Question

I have a java class. I want get all methods of this class that are public and defined in the class. My code is as follows:

public class Class1
{
    private String a;
    private String b;


    public void setA(String a){
        this.a = a;
    }

    public void setB(String b){
        this.b = b;
    }

    public String getA(){
        return a;
   }

    private String getB(){
        return b;
    }
}

I want Only to get setA, setB, and getA and then run this methods.

How do I do?

@assylias answer + call `invoke()` on all the methods of the method array returned by the method call. You will have to pass the object on which these methods should be called — TheLostMind, Apr 23 '15 at 10:28
@mortezamalvandi - Nope. `getDeclaredMethods()` will return all methods (public / private / protected).. `getMethods()` will return only public methods — TheLostMind, Apr 23 '15 at 10:30
You should see the [reflection](http://stackoverflow.com/questions/37628/what-is-reflection-and-why-is-it-useful) API — Max, Apr 23 '15 at 10:31

Ruchira Gayan Ranaweera · Accepted Answer · 2015-04-23T10:50:37.260

3

You should take a look at invoke() with reflection.

Class1 class1=new Class1();
Method[] methods=class1.getClass().getDeclaredMethods();
for(Method i:methods){
   if (Modifier.isPublic(i.getModifiers())) {
     try {
       i.invoke(class1, "a");
     } catch (IllegalAccessException | InvocationTargetException e) {
       e.printStackTrace();
     }
  }
}

edited Apr 23 '15 at 10:50

answered Apr 23 '15 at 10:32

Ruchira Gayan Ranaweera

34,993
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1

this get private methods too. – Morteza Malvandi Apr 23 '15 at 10:33
1

use `getMethods()` for getting *only public* methods.. `getDeclaredMethods()` returns all methods – TheLostMind Apr 23 '15 at 10:34
YA.. This will do .. +1 :) – TheLostMind Apr 23 '15 at 10:38
@mortezamalvandi In here already doing it.https://docs.oracle.com/javase/tutorial/reflect/member/methodInvocation.html – Ruchira Gayan Ranaweera Apr 23 '15 at 10:50
Class1 point = new Class1(); Class1 p = piont.getClass(); ...[your code] ... i.invoke(p, point); – Morteza Malvandi Apr 23 '15 at 10:52

Masudul · Answer 2 · 2015-04-23T10:42:14.893

1

Get all accessible public methods using getMethods, it will include all methods of Object class also, than you can only view Class1 public methods by checking getDeclaringClass()

 Class c = Class1.class;
 Method[] pubMeth = c.getMethods();
 for(Method m : pubMeth){
    if(m.getDeclaringClass() == c){ // Only Class1 pub methods
      System.out.println(m.getName());
    }
 }

edited Apr 23 '15 at 10:42

answered Apr 23 '15 at 10:30

Masudul

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How get public methods of a java class and then run it?

2 Answers2