InputStream,how to use

[linus dale]

InputStream  i=new FileInputStream(f);

why is this line correct
i is of class InputStream,how can it become object of FileInputStream

generally we write

DataInputStream dr=new DataInputStream(...);

or

BufferedReader  br= new  BufferedReader(...);

Also is there a class like FileInputStreamReader
or FileInputStreamWriter
or FileOutputStreamReader
or FileOutputStreamWriter

[Ulises Pulido]

Is correct because InputStream is a superclass of FileInputStream.

You can assign directly a reference of a child class to a parent class.


As far as I know there are not such classes you are asking for

But there are FileReader and FileWriter.

[linus dale]

Ulises Pulido wrote:Is correct because InputStream is a superclass of FileInputStream.

You can assign directly a reference of a child class to a parent class.


As far as I know there are not such classes you are asking for

But there are FileReader and FileWriter.

thanks