Link to home
Start Free TrialLog in
Avatar of chrisdtrinityphysicians
chrisdtrinityphysiciansFlag for India

asked on

interface java.util.Comparator


      I am new to java (basically I am a C#.Net guy). I extracted the java.util.Comparator interface. There I can see two abstract methods (1) public abstract int compare(java.lang.Object arg0, java.lang.Object arg1); and (2) public abstract boolean equals(java.lang.Object arg0);. I implemented this interface in MyClass and it is working fine.

My Question is:

      By normal OOPs rule, we should define all the abstract methods which are available in interface at the time of implementation.
       But here we have 2 abstract methods (compare and equals) and I am implementing only campare method. I just ignored the equals methods. But I am not getting any compilation or run-time error.
       At the same time, if I not implement the method compare, I am getting compilation error.

       What is the difference between the abstract methods compare and equals? Why "compare" method only mandatory? Please explain to me
Avatar of ksivananth
Flag of United States of America image

Link to home
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial