Cloneable interface is a marker interface which used for marking a class so that its objects can be cloned. If a class is not marked as cloneable and we try to clone its objects then "CloneNotSupportedException" will be thrown.
Types of cloning in java:
Shallow Cloning (Shallow Copy)
Deep Cloning (Deep copy)
In Shallow copy all the fields are just copied from source object to destination object.
If the source object is containing any field that holds a reference to another object then only the reference will be copied i.e. source and destination objects field(that particular field) will point to same memory location.
In Deep copy all the fields are deeply copied from source object to destination object.
If the source object is containing any field that holds a reference to another object then for the destination object a new copy will be created i.e. source and destination objects field will point to different memory location.