| Lesson 9 | String readers and writers |
| Objective | Write a program that reads a file and stores its contents in a single string. |
String Readers Writers(Read File)
It's sometimes convenient to use a string as a source of data or a target for output. Since Java strings are made of Unicode characters, this requires readers and writers. The java.io.StringReader class is initialized with a string and then reads successive characters from the string. The java.io.StringWriter class writes output into a string, a character at a time, expanding the output string as necessary. Unlike most other readers and writers, the StringReader and StringWriter classes do not perform character set conversions. Since these classes operate completely inside Java, all reading and writing takes place in Unicode.
StringReader Class
The StringReader class has the usual methods of Reader classes plus one constructor. StringReaders do support marking and resetting.
public StringReader(String s)
The StringWriter class
The StringWriter class has the usual methods of Writer classes plus one public constructor:
public StringWriter()
You can use the toString() method to return the String that's been written with this writer. Alternatively, the getBuffer() method returns the internal java.lang.StringBuffer object used by this StringWriter.
public String toString()
public StringBuffer getBuffer()
String Readers Writers - Exercise