# Changes to `java.io` after JDK 1.1 beta2

The class `java.lang.Throwable` now supports a `printStackTrace` method that takes a `PrintWriter` object rather than a `PrintStream` object.

Two convenience constructors, which take `OutputStream` objects rather than `Writer` objects, have been added to the `PrintWriter` class:

| `PrintWriter(OutputStream out)`
| `PrintWriter(OutputStream out, boolean autoFlush)`

These constructors are intended to ease the transition from the `PrintStream` class to the new `PrintWriter` class.

The `ByteArrayInputStream` class now supports the `mark` and `reset` methods.

The `ByteToCharConverter` and `CharToByteConverter` classes are no longer part of the public API. They have been moved to the `sun.io` package, along with the related classes `ConversionBufferFullException`, `MalformedInputException`, and `UnknownCharacterException`. An improved interface for access to low-level character conversion facilities is planned for a future release.

Since the converter classes are no longer public, a number of constructors and methods that previously took converter arguments now accept names of character encodings. They are:

`byte[]` | `String.getBytes(String enc)`
| `String(byte[] buf, String enc)`
| `String(byte[] buf, int off, int len, String enc)`
| `OutputStreamWriter(OutputStream out, String enc)`
| `InputStreamReader(InputStream in, String enc)`
`String` | `ByteArrayOutputStream.toString(String enc)`

The `InputStreamReader` and `OutputStreamWriter` classes no longer commit to buffering the underlying byte stream. Hence the constructors that allow the byte-buffer size to be specified have been removed. The `getCharacterEncoding` method of these classes has been renamed to `getEncoding`.

The `StreamTokenizer(InputStream)` constructor had been changed to use the default character encoding rather than assume ASCII. This turned out to break binary compatibility, so the original behavior has been restored and the constructor has been deprecated.

Comments to: java-io@java.sun.com | Mark Reinhold / 4 February 1997