Comparable interface
Comparable interface is used to order the objects of user-defined class.This interface is found in java.lang package and contains only one method named compareTo(Object).It provide only single sorting sequence i.e. you can sort the elements on based on single datamember only.For instance it may be either rollno,name,age or anything else.
Syntax:
public int compareTo(Object obj): is used to compare the current object with the specified object.
We can sort the elements of:
String objects
Wrapper class objects
User-defined class objects
Collections class provides static methods for sorting the elements of collection.If collection elements are of Set type, we can use TreeSet.But We cannot sort the elements of List.Collections class provides methods for sorting the elements of List type elements.
