Minor changes to `java.io` in the Java^TM 2 Platform v1.2

The following changes to package java.io were introduced in version 1.2 of the Java^TM 2 Platform. Minor changes to this package were:

The out field of the PrintWriter class is now protected rather than private, so that subclasses may access it
The RandomAccessFile class supports a new setLength method; and
The StringWriter(int) constructor is now public.

In the Java 2 Platform, the following constructors check for null input parameters:

The constructors PrintStream(OutputStream out) and PrintStream(OutputStream out, boolean autoFlush) will throw a NullPointerException if the parameter out is null.
The constructors InputStreamReader(InputStream in) and InputStreamReader(InputStream in, String enc) will throw a NullPointerException if the in parameter is null.
The constructors OutputStreamWriter(OutputStream out) and OutputStreamWriter(OutputStream out, String enc) will throw a NullPointerException if the out parameter is null.
The protected constructors Reader(Object lock) and Writer(Object lock) now throw NullPointerException if the lock parameter is null.

Minor changes to java.io in the JavaTM 2 Platform v1.2