more classpath progress

classpath/java/io/Writer.java

@@ -0,0 +1,19 @@
+package java.io;
+
+public abstract class Writer {
+  public void write(int c) throws IOException {
+    char[] buffer = new char[] { (char) c };
+    write(buffer);
+  }
+
+  public void write(char[] buffer) throws IOException {
+    write(buffer, 0, buffer.length);
+  }
+
+  public abstract void write(char[] buffer, int offset, int length)
+    throws IOException;
+
+  public abstract void flush() throws IOException;
+
+  public abstract void close() throws IOException;
+}