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Java Reflection - Attributes

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122 Discussions

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  • ChebotaryovNik
     + 0 comments

    There is a mistake in the problem description: It's written: JAVA reflection is a very powerful tool to inspect the attributes of a class in runtime. For example, we can retrieve the list of public fields of a class using getDeclaredMethods().

    It should be one of:

    • we can retrieve the list of methods of a class using getDeclaredMethods()
    • we can retrieve the list of fields of a class using getDeclaredFields()

    So, both methods return not only public fields/methods, but all fields/methods except inherited ones. And, appropriately, we have to use getDeclaredFields() for the fields, and getDeclaredMethods() for the methods.

  • mutisantos
     + 0 comments

    Just to mention to either run the code using Java 7 or add the following methods for the Student Class, as they are also required for the output assertion:

    		public void dnqvo(){  }
		public void bwkbd(){  }
		public void rmjig(){  }
		public void amftc(){  }
		public void kgwku(){  }
		public void ogvdl(){  }
		public void viyog(){  }
		public void pqfct(){  }
		public void iwhtf(){  }
		public void ptrup(){  }
		public void viwuu(){  }
		public void tkbpp(){  }
		public void plaob(){  }
		public void ghtlj(){  }
		public void pvgyp(){  }
		public void ormim(){  }
		public void cfwyc(){  }
		public void sumvl(){  }
		public void elyed(){  }
		public void cmkxa(){  }
		public void toxdp(){  }
		public void qthde(){  }
		public void whjtj(){  }
		public void moebl(){  }
		public void piwro(){  }
		public void atcks(){  }
		public void ehjdm(){  }
		public void ytijy(){  }
		public void migyc(){  }
		public void pnruo(){  }
		public void fmyce(){  }
		public void odyqp(){  }
		public void twyfa(){  }
		public void levtp(){  }
		public void ujxei(){  }
		public void dvvwq(){  }
		public void mcgme(){  }
		public void kbjlt(){  }
		public void ahqym(){  }
		public void tntpj(){  }
		public void jnskt(){  }
		public void dnpym(){  }
		public void jmopy(){  }
		public void uccfq(){  }
		public void vhxoi(){  }
		public void nixhb(){  }
		public void isqdf(){  }
		public void khuag(){  }
		public void hluvb(){  }

  • julian_n_robbins
     + 0 comments

    Bumping to top.. to say this only works in Java 7.

  • [deleted]     + 0 comments
    class Solution {

    public static void main(String[] args){
        Class student = new Student().getClass();
        Method[] methods = student.getDeclaredMethods();

        ArrayList<String> methodList = new ArrayList<>();
        for(Method method : methods){
            methodList.add(method.getName());
        }
        Collections.sort(methodList);
        for(String name : methodList){
            System.out.println(name);
        }
    }
}

  • arthur_avelar
     + 0 comments
    public class Solution {

        public static void main(String[] args){
            Student st = new Student();
            Class student = st.getClass();
            Method[] methods = student.getDeclaredMethods();

            ArrayList<String> methodList = new ArrayList<>();
            for(int m = 0; m < methods.length; m++){
                methodList.add(methods[m].getName());
            }
            Collections.sort(methodList);
            for(String name: methodList){
                System.out.println(name);
            }
        }

    }