collection abstract class in java
An abstract function abstract void. An abstract class can contain constructors and static methods.
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It is similar to the container in the C language.
. Collection is a interface present in javautilpackage. An abstract class can have abstract and non-abstract concrete methods and cant be instantiated with inheritance polymorphism abstraction encapsulation exception handling multithreading IO Streams Networking String Regex Collection JDBC etc. Abstract class in java with abstract methods and examples.
In C if a class has at least one pure virtual function then the class becomes abstractUnlike C in Java a separate keyword abstract is used to make a class abstract. It is used to represent a group of individual objects as a single unit. While the Collection interface adds no stipulations to the general contract for the Objectequals programmers who implement the Collection interface directly in other words create a class that is a Collection but is not a Set or a List must exercise care.
An abstract is a java modifier applicable for classes and methods in java but not for Variables. An abstract class can contain overloaded abstract methods. Abstract class abstract class Shape int color.
An abstract class can contain the main method and the final method. An abstract keyword can only be used with class and method. The collection is considered as the root interface of the collection framework.
If a class extends the abstract class it must also implement at least one of the abstract method.
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