Difference between comparable and comparaor in Java? interview quesion

                              Comparator vs Comparable

• Comparable interface can be used to provide single way of sorting and Comparator interface is used to provide different ways of sorting.
  
• For using Comparable, Class needs to implement it and for using Comparator we don’t need to make any change in the class.
• Comparable interface is in java.lang package and Comparator interface is present in java.util package.
• If sorting of objects needs to be based on natural order then use Comparable whereas    if you sorting needs to be done on attributes of different objects, then use Comparator in Java.
• We don’t need to make any code changes at client side for using Comparable, Arrays.sort() or Collection.sort() methods automatically uses the compareTo() method of the class. For Comparator, client needs to provide the Comparator class to use in compare() method.
•  We can sort the list elements of Comparable type by Collections.sort(List) method and we can sort the list elements of Comparator type by Collections.sort(List, Comparator) method.
  
  
  
  
  
  

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