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  1. import java.lang.reflect.Field;
  2.  
  3. class TesteReflection {
  4.     public static Field acharField(Class<?> onde, String nome) throws NoSuchFieldException {
  5.         if (onde == null) throw new NullPointerException();
  6.         if (nome == null) throw new NullPointerException();
  7.         NoSuchFieldException excecao = null;
  8.         for (Class<?> c = onde; c != null; c = c.getSuperclass()) {
  9.             try {
  10.                 return c.getDeclaredField(nome);
  11.             } catch (NoSuchFieldException e) {
  12.                 if (excecao == null) excecao = e;
  13.             }
  14.         }
  15.         throw excecao;
  16.     }
  17.  
  18.     public static class A1 {
  19.         private String teste;
  20.     }
  21.  
  22.     public static class A2 extends A1 {}
  23.     public static class A3 extends A2 {}
  24.  
  25.     public static void main(String[] args) throws NoSuchFieldException {
  26.         Field f = acharField(A3.class, "teste");
  27.         System.out.println("Achou o Field " + f.getName() + ".");
  28.         try {
  29.         	acharField(A3.class, "naoTem");
  30.         	throw new AssertionError("Ops, não deveria chear aqui.");
  31.         } catch (NoSuchFieldException e) {
  32.         	System.out.println("Não achou o Field naoTem.");
  33.         }
  34.         System.out.println("Teste concluído com sucesso.");
  35.     }
  36. }
Success #stdin #stdout 0.1s 27776KB
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Standard input is empty
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Achou o Field teste.
Não achou o Field naoTem.
Teste concluído com sucesso.
https://ideone.com/v1olcT
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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