http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html#valueOf(int)

String intString = String.valueOf(intValue);

--
now with more cowbell

You don't "convert a sequence of variables of type int to a String" without
providing proper context.

Since you didn't state your problem clearly, assumptions must be made.
You're reading off a java.io.InputStream using the read() method and wish to
convert the raw data to a String.
You do this by using a java.io.InputStreamReader to convert the raw data to
character data.
Then you might consider writing the character data to a java.io.StringWriter
or a java.lang.StringBuffer.

If this assumption is incorrect, state your problem clearly.