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Java FilterReader

Java FilterReader is used to perform filtering operation on reader stream. It is an abstract class for reading filtered character streams.

The FilterReader provides default methods that passes all requests to the contained stream. Subclasses of FilterReader should override some of its methods and may also provide additional methods and fields.

Field

Modifier Type Field Description
protected Reader in The underlying character-input stream.

Constructors

Modifier Constructor Description
protected FilterReader(Reader in) It creates a new filtered reader.

Method

Modifier and Type Method Description
void close() It closes the stream and releases any system resources associated with it.
void mark(int readAheadLimit) It marks the present position in the stream.
boolean markSupported() It tells whether this stream supports the mark() operation.
boolean ready() It tells whether this stream is ready to be read.
int read() It reads a single character.
int read(char[] cbuf, int off, int len) It reads characters into a portion of an array.
void reset() It resets the stream.
long skip(long n) It skips characters.

Example

In this example, we are using "javaFile123.txt" file which contains "India is my country" text in it. Here, we are converting whitespace with question mark '?'.

Output:

India?is?my?country

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