Java Interview Question #5: What is difference between Comparator and Comparable in Java

Published: 31 July 2016
on channel: JavaRadio

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a. Both interfaces are used during shorting
b. The object who is being compared implements Comparable
c. The object who compares or by using which comparison happens- implements Comparator.
d. Comparable – int compareTo() and Comparator – int compare()
e. Comparable:
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i. Collections.sort(empList);
ii. Arrays.sort(empArray);
Note: Employee object need to implement Comparable interface

f. Comparator:
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i. Collections.sort(empList, new SortEmployeeById());
ii. Arrays.sort(empArray, new SortEmployeeByName());
Note: SortEmployeeById, SortEmployeeByName need to implement Comparator interface

g. More info:http://www.beingjavaguys.com/2013/10/...

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