Example usage for java.lang Class getDeclaredFields

Introduction

In this page you can find the example usage for java.lang Class getDeclaredFields.

Prototype

@CallerSensitive
public Field[] getDeclaredFields() throws SecurityException

Source Link

Document

Returns an array of Field objects reflecting all the fields declared by the class or interface represented by this Class object.

Usage

From source file:Main.java

public static Field getField(Class<?> clazz, String fieldName) {
    final Field[] fields = clazz.getDeclaredFields();
    final Field field = getField(fields, fieldName);
    if (field == null) {
        final Class<?> superClass = clazz.getSuperclass();
        if (Object.class.equals(superClass)) {
            return null;
        }//  w w w .j  a v a2 s  . com
        return getField(superClass, fieldName);
    }
    return field;
}

From source file:ReflectionTest.java

/**
 * Prints all fields of a class//  www .j a v  a 2 s .  c om
 * @param cl a class
 */
public static void printFields(Class cl) {
    Field[] fields = cl.getDeclaredFields();

    for (Field f : fields) {
        Class type = f.getType();
        String name = f.getName();
        System.out.print("   ");
        String modifiers = Modifier.toString(f.getModifiers());
        if (modifiers.length() > 0)
            System.out.print(modifiers + " ");
        System.out.println(type.getName() + " " + name + ";");
    }
}

From source file:testReflection.java

public static Field[] getAllFields(Class klass) {
    List<Field> fields = new ArrayList<Field>();
    fields.addAll(Arrays.asList(klass.getDeclaredFields()));
    if (klass.getSuperclass() != null) {
        fields.addAll(Arrays.asList(getAllFields(klass.getSuperclass())));
    }/*from  ww w  .j ava2s . c  o m*/
    return fields.toArray(new Field[] {});
}

From source file:Main.java

/**
 * Finds a set of constant static byte field declarations in the class that have the given value
 * and whose name match the given pattern
 * @param cl class to search in/*ww  w. ja v a  2s  .  com*/
 * @param value value of constant static byte field declarations to match
 * @param regexPattern pattern to match against the name of the field     
 * @return a set of the names of fields, expressed as a string
 */
private static String findConstByteInClass(Class<?> cl, byte value, String regexPattern) {
    Field[] fields = cl.getDeclaredFields();
    Set<String> fieldSet = new HashSet<String>();
    for (Field f : fields) {
        try {
            if (f.getType() == Byte.TYPE && (f.getModifiers() & Modifier.STATIC) != 0
                    && f.getName().matches(regexPattern) && f.getByte(null) == value) {
                fieldSet.add(f.getName());
            }
        } catch (IllegalArgumentException e) {
            //  ignore
        } catch (IllegalAccessException e) {
            //  ignore
        }
    }
    return fieldSet.toString();
}

From source file:Main.java

private static void init() {
    try {//from  ww w.jav a2s  . c  o m
        // read all com.android.internal.R
        Class clazz = Class.forName("com.android.internal.R$layout");
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            // public static final
            if (Modifier.isPublic(field.getModifiers()) && Modifier.isStatic(field.getModifiers())
                    && Modifier.isFinal(field.getModifiers())) {
                try {
                    int id = field.getInt(null);
                    sSystemLayoutResIds.put(id, field.getName());
                } catch (IllegalAccessException e) {
                }
            }
        }
    } catch (Exception e) {
    }
}

From source file:Main.java

public static Object mergedObject(Object oldObject, Object newObject) throws Exception {
    Class<?> cls = newObject.getClass();
    Field[] fields = cls.getDeclaredFields();
    for (Field field : fields) {
        Class<?> clsType = field.getType();
        String name = field.getName();
        String method = name.substring(0, 1).toUpperCase() + name.substring(1, name.length());
        String strGet = "get" + method;
        Method methodGet = cls.getDeclaredMethod(strGet);
        Object object = methodGet.invoke(newObject);
        if (object != null) {
            String strSet = "set" + method;
            Method methodSet = cls.getDeclaredMethod(strSet, clsType);
            Object objValue = typeConversion(clsType, object.toString());
            methodSet.invoke(oldObject, objValue);
        }//from w  w w.jav a  2  s  . com
    }
    return oldObject;
}

From source file:Main.java

public static List<Field> getRealFields(Class objectClass) {
    List<Field> result = new LinkedList<Field>();
    for (Field item : objectClass.getDeclaredFields()) {
        if (!item.isSynthetic())
            result.add(item);//  w  w  w .  j  a va  2 s  .c  o m
    }
    return result;
}

From source file:Main.java

/**
 * Get a Hashtable of all class member fields (including private) of the
 * given object/*from w  ww  . j  av a  2  s  .  c om*/
 * 
 * @param objectInstance Object to get data from
 * @return Hashtable of all values
 * 
 * @throws IllegalArgumentException
 * @throws IllegalAccessException
 */
public static Map<String, Object> getAllFields(Object objectInstance)
        throws IllegalArgumentException, IllegalAccessException // NOSONAR
{
    HashMap<String, Object> map = new HashMap<String, Object>();

    Class<? extends Object> clazz = objectInstance.getClass();

    Field fields[] = clazz.getDeclaredFields();
    for (int i = 0; i < fields.length; i++) {
        Field f = fields[i];
        f.setAccessible(true);

        String fieldName = f.getName();
        Object fieldValue = f.get(objectInstance);

        map.put(fieldName, fieldValue);
    }

    return map;
}

From source file:Main.java

static Unsafe getSMU() {
    try {//w w w .  java 2s  .c  om
        return sun.misc.Unsafe.getUnsafe();
    } catch (SecurityException tryReflectionInstead) {
        // ignore
    }
    try {
        return java.security.AccessController.doPrivileged((PrivilegedExceptionAction<Unsafe>) () -> {
            Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;
            for (Field f : k.getDeclaredFields()) {
                f.setAccessible(true);
                Object x = f.get(null);
                if (k.isInstance(x))
                    return k.cast(x);
            }
            throw new NoSuchFieldError("the Unsafe");
        });
    } catch (java.security.PrivilegedActionException e) {
        throw new RuntimeException("Could not initialize intrinsics", e.getCause());
    }
}

From source file:com.vmware.qe.framework.datadriven.impl.injector.DataInjectorUsingReflection.java

private static Field getField(Class<?> clazz, String fieldName) {
    Class<?> tmpClass = clazz;
    do {//from ww w .  j a v a 2  s .  c o  m
        for (Field field : tmpClass.getDeclaredFields()) {
            String candidateName = field.getName();
            if (!candidateName.equals(fieldName)) {
                continue;
            }
            field.setAccessible(true);
            return field;
        }
        tmpClass = tmpClass.getSuperclass();
    } while (clazz != null);
    throw new RuntimeException("Field '" + fieldName + "' not found on class " + clazz);
}