Java Collection
This class serves as an handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes. This handle can be err, in or out. It is used to create a FileInputStream or FileOutputStream to contain it. It inherits methods from the java.io.Object class.
Some advantages of collection framework are as follows:
- Decreases programming effort
- Increases speed of program and quality
- Consistent API
Various interfaces present in the collections framework are as follows:
- equals() – Used to match two collections
- removeIf() – Used to remove element if it matches the condition
- spliterator() – Used to generate a spliterator over the specified elements
- iterator() – Used to return an iterator for invoking collection
- stream() – Used to return a sequential stream with the collection at its source
- parallelStream() - Used to return a parallel stream with the collection at its source
- toArray() – Used to convert collection to array
Some methods of collection interface are as follows:
- Collection interface
- Iterable interface
- List interface
- Set interface
- Sorted Set interface
- Queue interface
- Map interface
Example :
<![CDATA[
import java.util.*;
class TestJavaCollection1{
public static void main(String args[]){
ArrayList<String> list=new ArrayList<String>();
list.add("Knowledge2life 1");
list.add("Knowledge2life 2");
Iterator itr=list.iterator();
while(itr.hasNext()){
System.out.println(itr.next());
}
}
} ]]>
OUTPUT:
Knowledge2life 1
Knowledge2life 2
