more classpath progress

classpath/java/lang/StringBuffer.java

@@ -0,0 +1,39 @@
+package java.lang;
+
+public class StringBuffer {
+  private final StringBuilder sb = new StringBuilder();
+
+  public synchronized StringBuffer append(String s) {
+    sb.append(s);
+    return this;
+  }
+
+  public synchronized StringBuffer append(Object o) {
+    sb.append(o);
+    return this;
+  }
+
+  public synchronized StringBuffer append(int v) {
+    sb.append(v);
+    return this;
+  }
+
+  public synchronized StringBuffer append(long v) {
+    sb.append(v);
+    return this;
+  }
+
+  public synchronized int length() {
+    return sb.length();
+  }
+
+  public synchronized void getChars(int srcOffset, int srcLength, char[] dst,
+                                    int dstOffset)
+  {
+    sb.getChars(srcOffset, srcLength, dst, dstOffset);
+  }
+
+  public synchronized String toString() {
+    return sb.toString();
+  }
+}