Difference between abstract class and interface

Posted by nectar on Stack Overflow See other posts from Stack Overflow or by nectar
Published on 2010-06-03T10:20:28Z Indexed on 2010/06/03 10:24 UTC
Read the original article Hit count: 213

Filed under:

interface

|

abstract-class

|

oops

A class implementing an interface has to implement all the methods of the interface, but if that class is implementing an abctract class is it necessary to implement all abstract methods?
If not, can we create the object of that class which is implementing the Abstract class???

© Stack Overflow or respective owner

Related posts about interface

Outbound traffic being blocked for MIP/VIPped servers (Juniper SSG5)

as seen on Server Fault - Search for 'Server Fault'
As we've been having some problems with sporadic packet loss, I've been preparing a replacement router (also an SSG5) for our current Juniper SSG5. I've setup the new SSG5 identically to the old one. We have a /29 IP range with a single IP setup as a MIP map to a server and two others being used… >>> More
Allowing connections initiated from outside

as seen on Server Fault - Search for 'Server Fault'
I've got an old Juniper SSG5 running ScreenOS 5.4.0r6.0. Once a day, more or less, it'll start randomly dropping packets at a rate of ~5-10%. We currently solve this issue by simply rebooting the unit, after which it resumes working in perfect condition. As this error has started appearing randomly… >>> More
Can we define an interface within an interface?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi , I like to know can we define an interface within an interface. like interface abc { void show(); public interface xyz { void read(); } } This was question asked in interview. Any real time use of this. >>> More
Juniper SSG-5 subinterface vlan routing to the internet

as seen on Server Fault - Search for 'Server Fault'
I'm unable to get a brand new Juniper SSG-5 with latest 6.3.0r05 firmware routing to the internet from a subinterface I created on bgroup0 setup as vlan2 (bgroup0.1 on "wifi" zone). When connected on the default vlan it gets on the internet just fine. When I switch to vlan2 I'm unable to get to the… >>> More
How to change mouse pointer icon in Xfce Debian 7 Wheezy?

as seen on Super User - Search for 'Super User'
I copied the cursor theme (oxy-neon or Oxygen Neon) to /usr/share/icons and from Applications Menu - Settings - Mouse, I am able to see the new theme. I clicked on it and the pointer doesn't change. However the text typing icon ('I'), busy icon, hand icon, and resize window icons got changed. The… >>> More

Related posts about abstract-class

abstract class extends abstract class in php?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am working on a simple abstract database class. In my usage of this class, I'll want to have some instance be a singleton. I was thinking of having a abstract class that is not a singleton, and then extend it into another abstract class that is a singleton. Is this possible? Recommended? >>> More
Derive abstract class from non-abstract class

as seen on Stack Overflow - Search for 'Stack Overflow'
Is it OK to derive an abstract class from a non-abstract class or is there something wrong with this approach? Here´s a little example: public class Task { // Some Members } public abstract class PeriodicalTask : Task { // Represents a base class for task that has to be done periodicaly. … >>> More
Should I use a collection here?

as seen on Stack Overflow - Search for 'Stack Overflow'
So I have code set up like this: public interface IInterface { public void setField(Object field); } public abstract class AbstractClass extends JPanel implements IInterface { private Object field_; public void setField(Object field) { field_ = field; } } public class… >>> More
abstract class NumberFormat - very confuse about getInstance()

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm new to Java and I have a beginner question: NumberFormat is an abstract class and so I assume I can't make an instance of it. But there is a public static (factory?) method getInstance() that allow me to do NumberFormat nf = NumberFormat.getInstance(); I'm quite confuse. I'll be glad… >>> More
abstract class NumberFormat - very confused about getInstance()

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm new to Java and I have a beginner question: NumberFormat is an abstract class and so I assume I can't make an instance of it. But there is a public static (factory?) method getInstance() that allow me to do NumberFormat nf = NumberFormat.getInstance(); I'm quite confuse. I'll be glad… >>> More