Java Utililty Methods Field from Class

List of utility methods to do Field from Class

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Description

The list of methods to do Field from Class are organized into topic(s).

Method

FieldfindDeclaredField(Class javaClass, String fieldName)
Finding a field within a class potentially has to navigate through it's superclasses to eventually find the field. 
try {
    return javaClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException ex) {
    Class superclass = javaClass.getSuperclass();
    if (superclass == null) {
        throw ex;
    } else {
        return findDeclaredField(superclass, fieldName);
...
FieldgetDeclaredField(final Class javaClass, final String fieldName, final boolean shouldSetAccessible)
Get a field actually declared in a class and wrap the call in doPrivileged if necessary. 
Field field = javaClass.getDeclaredField(fieldName);
if (shouldSetAccessible) {
    field.setAccessible(true);
return field;
Field[]getDeclaredFields(final Class clazz)
Get the list of fields in a class. 
return clazz.getDeclaredFields();
FieldgetField(Class type, String name)
returns field for given name in given type 
try {
    Field result = type.getDeclaredField(name);
    result.setAccessible(true);
    return result;
} catch (NoSuchFieldException e) {
    throw new IllegalArgumentException("Could not access " + type.getName() + "." + name + " field");
FieldgetField(final Class javaClass, final String fieldName, final boolean shouldSetAccessible)
Get a field in a class or its superclasses and wrap the call in doPrivileged if necessary. 
Field field = (Field) findDeclaredField(javaClass, fieldName);
if (shouldSetAccessible) {
    field.setAccessible(true);
return field;
StringgetJsonValueFieldName(String className)
get Json Value Field Name 
switch (className) {
case "java.net.URL":
    return "toString";
case "java.lang.StringBuilder":
    return "toString";
case "java.lang.StringBuffer":
    return "toString";
case "java.util.UUID":
...
StringgetProperField(Class objectClass)
get Proper Field 
for (Field f : objectClass.getFields()) {
    if (f.getType() == SocketAddress.class) {
        return f.getName();
return "N/A";
voidsetPrivateField(String fieldName, Class containingClass, Object target, Object value)
set Private Field 
try {
    Field field = containingClass.getDeclaredField(fieldName);
    field.setAccessible(true);
    field.set(target, value);
} catch (Exception e) {
    throw new RuntimeException(e);