Generics and Collections

When using generics in Java, universal (generic) algorithms can be created for different types.

In Java, generics allow classes and interface types to be used as parameters to define classes, interfaces, or methods.

In Java, generics allow for stronger type checking and bug detection at compile time.

When using generics in Java, the diamond operator (<>) is used to declare the type parameter.

When using generics in Java, the super keyword is used to define a lower bound type on a wildcard.

In Java, the wildcard (?) is used to specify an unknown generic type parameter.

When using generics in Java, the extends keyword is used to define an upper bound type on type parameter or wildcard.

Wrapper classes are provided to allow primitive values to be used with generic code.

A collection stores many elements within a single object.

The collections framework provides ready to use collection data structures and algorithms.

When using collections in Java, aggregate operations are used to access and modify a stream of elements.

The Collection interface is the root interface of the collections framework.

The List interface is used to store elements in an ordered collection.

The Set interface is used to store unique elements in a collection.

The Queue and Deque interfaces are used to hold elements in a collection to process in a specific order.

The Map interface stores elements as key-value pairs.

Iterators and enhanced for loops are used to traverse collections in Java.

Collections are generic, and a type parameter must be specified.