quick sketch of java/io/*

classpath/java/io/OutputStream.java

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