Examples of java.lang.reflect.Field

java.lang.reflect.Field
A Field provides information about, and dynamic access to, a single field of a class or an interface. The reflected field may be a class (static) field or an instance field.
A Field permits widening conversions to occur during a get or set access operation, but throws an IllegalArgumentException if a narrowing conversion would occur. @see Member @see java.lang.Class @see java.lang.Class#getFields() @see java.lang.Class#getField(String) @see java.lang.Class#getDeclaredFields() @see java.lang.Class#getDeclaredField(String) @author Kenneth Russell @author Nakul Saraiya

          }


          String propertyName = Character.toLowerCase(methodName
              .charAt(3)) + methodName.substring(4);


          Field field = null;
          try {
            field = clazz.getDeclaredField(propertyName);
          } catch (SecurityException e) {
            e.printStackTrace();
          } catch (NoSuchFieldException e) {
            e.printStackTrace();
          }


          if (field != null
              && Modifier.isTransient(field.getModifiers())) {
            continue;
          }


          try {
            JsonObjMetaInfo fieldSerializer = new JsonObjMetaInfo();
            fieldSerializer.setPropertyName(propertyName);
            fieldSerializer.setMethod(method);
            fieldList.add(fieldSerializer);
          } catch (IllegalArgumentException e) {
            e.printStackTrace();
          }
        } else if (methodName.startsWith("is")) { // 取is方法的返回值
          if (methodName.length() < 3
              || !Character.isUpperCase(methodName.charAt(2))) {
            continue;
          }


          String propertyName = Character.toLowerCase(methodName
              .charAt(2)) + methodName.substring(3);


          Field field = null;
          try {
            field = clazz.getDeclaredField(propertyName);
          } catch (SecurityException e) {
            e.printStackTrace();
          } catch (NoSuchFieldException e) {
            e.printStackTrace();
          }
          if (field != null
              && Modifier.isTransient(field.getModifiers())) {
            continue;
          }


          try {
            JsonObjMetaInfo fieldSerializer = new JsonObjMetaInfo();

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    Class<?> currentType = clazz;
    for (int i = 0, tokensLength = tokens.length; i < tokensLength; i++) {
      String token = tokens[i];
      descriptorChain[i] = new ChainedPropertyDescriptor(currentType, token, isIndexed, index);
      if (i < tokensLength) {
        Field field = ReflectionUtils.getFieldFromBean(currentType, tokens[i]);
        currentType = field.getType();
      }
    }
  }

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        CreateUpdateProcedureCommand cloned = (CreateUpdateProcedureCommand)s1.clone();
        
        Class clazz = CreateUpdateProcedureCommand.class;
        Class superClazz = Command.class;
        
        Field field = null;
        //Command class state
        field = superClazz.getDeclaredField("tempGroupIDs"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
        field = superClazz.getDeclaredField("externalGroups"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
        field = superClazz.getDeclaredField("isResolved"); //$NON-NLS-1$
        field.setAccessible( true );
        assertTrue(((Boolean)field.get(cloned)).booleanValue());
        field = superClazz.getDeclaredField("option"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
        
        //CreateUpdateProcedure class state
        field = clazz.getDeclaredField("block"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
        field = clazz.getDeclaredField("symbolMap"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
        field = clazz.getDeclaredField("isUpdateProcedure"); //$NON-NLS-1$
        field.setAccessible( true );
        assertTrue(((Boolean)field.get(cloned)).booleanValue());
        field = clazz.getDeclaredField("projectedSymbols"); //$NON-NLS-1$
        field.setAccessible( true );
        assertNotNull(field.get(cloned));
    }

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    }
  }


  @Test
  public void shouldGetField() {
    Field field = ReflectionUtils.getFieldFromBean(GrandChild.class, "c");
    assertNotNull(field);
  }

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    assertNotNull(field);
  }


  @Test
  public void shouldGoToSuperclass() {
    Field field = ReflectionUtils.getFieldFromBean(GrandChild.class, "a");
    assertNotNull(field);


    field = ReflectionUtils.getFieldFromBean(GrandChild.class, "b");
    assertNotNull(field);
  }

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    assertNotNull(field);
  }


  @Test
  public void shouldModifyAccessor() {
    Field field = ReflectionUtils.getFieldFromBean(String.class, "offset");
    assertNotNull(field);
  }

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    return getFieldFromBean(clazz, fieldName, clazz);
  }


  private static Field getFieldFromBean(Class<?> clazz, String fieldName, final Class<?> originalClass)  {
    try {
      Field field = clazz.getDeclaredField(fieldName);
      // Allow access to private instance var's that dont have public setter.
      field.setAccessible(true);
      return field;
    } catch (NoSuchFieldException e) {
      if (clazz.getSuperclass() != null) {
        return getFieldFromBean(clazz.getSuperclass(), fieldName, originalClass);
      }

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        Iterator<ImportNode> iter = source.getAST().getImports().iterator();
        while (iter.hasNext()) {
            ImportNode importedClass = iter.next();
            if (!isVisible(source, importedClass.getClassName())) {
                try {
                    Field field = ModuleNode.class.getDeclaredField("imports");
                    field.setAccessible(true);
                    Map value = (Map) field.get(source.getAST());
                    value.remove(importedClass.getAlias());
                } catch (Exception e) {
                    throw UncheckedException.asUncheckedException(e);
                }
            }

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     * @return list of bindings defined for that class (as a text string)
     * @throws JiBXException on error accessing binding information
     */
    private static String getBindingList(Class clas)throws JiBXException {
        try {
            Field field = clas.getDeclaredField(BINDINGLIST_NAME);
            try {
                // should be able to access field anyway, but just in case
                field.setAccessible(true);
            } catch (Exception e) { /* deliberately left empty */ }
            return (String)field.get(null);
        } catch (NoSuchFieldException e) {
            throw new JiBXException
                ("Unable to access binding information for class " +
                clas.getName() +
                "\nMake sure the binding has been compiled", e);

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            AnnotatedElement annotationTarget = null;
            if (method.getAnnotation(annotationType) != null) {
                annotationTarget = method;
            } else {
                try {
                    Field field = method.getDeclaringClass().getDeclaredField(fieldName);
                    if (field.getAnnotation(annotationType) != null) {
                        annotationTarget = field;
                    }
                } catch (NoSuchFieldException e) {
                    // ok - ignore
                }

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