abstract class vs interface in java 8
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sure! in java, both abstract classes and interfaces are used to achieve abstraction, but they serve different purposes and have different features. let's break down the differences and then provide examples for each.
abstract class vs interface
*1. abstract class:*
an abstract class is a class that cannot be instantiated on its own and may contain abstract methods (without a body) as well as concrete methods (with a body).
it can have instance variables and constructors.
an abstract class can extend another class (abstract or concrete) and can implement interfaces.
a class can only extend one abstract class (single inheritance).
*2. interface:*
an interface is a reference type in java, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.
interfaces cannot have instance variables or constructors.
a class can implement multiple interfaces (multiple inheritance).
starting from java 8, interfaces can have default methods (methods with a body) and static methods.
key differences
| feature | abstract class | interface |
|-------------------------------|----------------------------------|-----------------------------------|
| can contain method bodies | yes (concrete methods) | yes (default methods) |
| can contain instance variables | yes | no |
| constructors | yes | no |
| inheritance | single inheritance | multiple inheritance |
| access modifiers for methods | yes (public, protected, private)| methods are implicitly public |
code examples
example of an abstract class
example of an interface
summary
use *abstract classes* when you have a common base class that contains shared state or ...
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