How can an object be serialized for transfer or storage in a Bundle type container?

In Android, to pass or save an object in a container of type Bundle, the object must be serializable. Main serialization methods:

1. Parcelable — an interface optimized for Android, allows fast serialization of objects.
2. Serializable — a standard Java interface, easier to implement but less efficient in performance.

Example with Parcelable:

public class User implements Parcelable {
    private String name;
    private int age;

    protected User(Parcel in) {
        name = in.readString();
        age = in.readInt();
    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel in) {
            return new User(in);
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(age);
    }
}

// Usage:
Bundle bundle = new Bundle();
bundle.putParcelable("user", userObject);

Thus, the object can be placed in a Bundle and passed between Android components.