Java Reflection Field Find findField(Class clazz, String name)

Description

Attempt to find a Field field on the supplied Class with the supplied name .

License

Apache License

Parameter

Parameter	Description
clazz	the class to introspect
name	the name of the field

Return

the corresponding Field object, or null if not found

Declaration

public static Field findField(Class<?> clazz, String name) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.lang.reflect.Field;

public class Main {
    /**/*from  w w  w .j ava2s  .com*/
     * Attempt to find a {@link Field field} on the supplied {@link Class} with the
     * supplied {@code name}. Searches all superclasses up to {@link Object}.
     * @param clazz the class to introspect
     * @param name the name of the field
     * @return the corresponding Field object, or {@code null} if not found
     */
    public static Field findField(Class<?> clazz, String name) {
        return findField(clazz, name, null);
    }

    /**
     * Attempt to find a {@link Field field} on the supplied {@link Class} with the
     * supplied {@code name} and/or {@link Class type}. Searches all superclasses
     * up to {@link Object}.
     * @param clazz the class to introspect
     * @param name the name of the field (may be {@code null} if type is specified)
     * @param type the type of the field (may be {@code null} if name is specified)
     * @return the corresponding Field object, or {@code null} if not found
     */
    public static Field findField(Class<?> clazz, String name, Class<?> type) {
        Class<?> searchType = clazz;
        while (Object.class != searchType && searchType != null) {
            Field[] fields = getDeclaredFields(searchType);
            for (Field field : fields) {
                if ((name == null || name.equals(field.getName()))
                        && (type == null || type.equals(field.getType()))) {
                    return field;
                }
            }
            searchType = searchType.getSuperclass();
        }
        return null;
    }

    /**
     * This variant retrieves {@link Class#getDeclaredFields()} from a local cache
     * in order to avoid the JVM's SecurityManager check and defensive array copying.
     * @param clazz the class to introspect
     * @return the cached array of fields
     * @see Class#getDeclaredFields()
     */
    private static Field[] getDeclaredFields(Class<?> clazz) {
        return clazz.getDeclaredFields();
    }
}

Related

1. findField(Class clazz, String fieldName)
2. findField(Class clazz, String fieldName)
3. findField(Class clazz, String fieldName)
4. findField(Class clazz, String fieldName)
5. findField(Class clazz, String fname, boolean isSearchSuperclass)
6. findField(Class clazz, String name)
7. findField(Class clazz, String name)
8. findField(Class clazz, String name)
9. findField(Class clazz, String name)