Java Utililty Methods InputStream Deserialize to Object

ObjectInputStream is = new ObjectInputStream(in);
return is.readObject();

ObjectInputStream oin = new ObjectInputStream(in);
try {
    return (oin.readObject());
} catch (ClassNotFoundException e) {
    return (null);

if (cls == null)
    throw new NullPointerException("cls");
Object obj = deserialize(in, cls);
if (!cls.isInstance(obj)) {
    throw new InvalidObjectException("type of deserialized instance not of required class.");
return obj;

if (inputStream == null)
    return null;
ObjectInputStream ois = new ObjectInputStream(inputStream);
return (T) ois.readObject();

ObjectInputStream in = null;
try {
    in = new ObjectInputStream(inputStream);
    return in.readObject();
} catch (ClassNotFoundException ex) {
    throw ex;
} catch (IOException ex) {
    throw ex;
...

Deserializes an Object from the specified stream.

The stream will be closed once the object is written.

if (inputStream == null) {
    throw new IllegalArgumentException("The InputStream must not be null");
ObjectInputStream in = null;
try {
    in = new ObjectInputStream(inputStream);
    return in.readObject();
} catch (ClassNotFoundException ex) {
...

try {
    ObjectInputStream oip = new ObjectInputStream(is);
    return (Serializable) oip.readObject();
} catch (IOException e) {
    throw new IllegalArgumentException(e);
} catch (ClassNotFoundException e) {
    throw new IllegalArgumentException(e);

ObjectInputStream in = new ObjectInputStream(is);
@SuppressWarnings("unchecked")
T e = (T) in.readObject();
in.close();
return e;

ObjectInputStream tais = null;
try {
    tais = new ObjectInputStream(sourceInputStream);
    T result = (T) tais.readObject();
    return result;
} catch (Exception e) {
    throw new IllegalStateException(e);
} finally {
...

if (stream == null) {
    return null;
try {
    return stream.readObject();
} catch (IOException e) {
    throw new IllegalArgumentException("Could not deserialize object", e);
} catch (ClassNotFoundException e) {
...