StringReader class

A character stream whose source is a string.

StringReader(String s)

Creates a new string reader.

void close()

Closes the stream and releases any system resources associated with it.

void mark(int readAheadLimit)

Marks the present position in the stream.

boolean markSupported()

Tells whether this stream supports the mark() operation, which it does.

int read()

Reads a single character. The character read, or -1 if the end of the stream has been reached.

int read(char[] cbuf, int off, int len)

Reads characters into a portion of an array. The character read, or -1 if the end of the stream has been reached.

boolean ready()

Tells whether this stream is ready to be read.

void reset()

Resets the stream to the most recent mark, or to the beginning of the string if it has never been marked.

long skip(long ns)

Skips the specified number of characters in the stream.

Revised from Open JDK source code

import java.io.StringReader;

public class Main {
  public static void main(String[] args) throws Exception{
    StringReader reader = new StringReader("java2s.com");
    int ch = 0;
    while(true){
      ch =  reader.read();
      if(ch == -1){
        break;
      }
      System.out.println((char)ch);
    }
  }
}

The output:

j
a
v
a
2
s
.
c
o
m