Run as Java class and method string name

I got Java class or method name as a string and looked for it to be executed.

package classname;

public class AppTest{

    public void printIt(){

      System.out.println("printIt() no param");

    }

    

    public void printItString(String temp){

      System.out.println("printIt() with param String : " + temp);

    }

    

    public void printItInt(int temp){

      System.out.println("printIt() with param Int : " + temp);

    }

} 

package classname;

import java.lang.reflect.Method;

public class ReflectApp{

  public static void main(String[] args){

    Class noparams[]={};

    

    Class[] paramString=new Class[1];

    paramString[0]=String.class;

    

    Class[] paramInt=new Class[1];

    paramInt[0]=Integer.TYPE;

    

    try{

      Class cls=Class.forName("classname.AppTest");

      Object obj=cls.newInstance();

      

      Method method=cls.getDeclaredMethod("printIt", noparams);

      method.invoke(obj,null);

      

      method=cls.getDeclaredMethod("printItString", paramString);

      method.invoke(obj, new String("AA"));

      

      method=cls.getDeclaredMethod("printItInt", paramInt);

      method.invoke(obj, 123);

    }catch(Exception e){

      e.printStackTrance();

    }

  }

}

If you run it, the result is


printIt() no param
printIt() with param String : AA
printIt() with param Int : 123

As you can see from the source above, you can see that the class name and method name were executed as strings.