factor Properties and PropertieResourceBundle out of ResourceBundle

classpath/java/util/PropertyResourceBundle.java

@@ -0,0 +1,16 @@
+package java.util;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+public class PropertyResourceBundle extends ResourceBundle {
+  private final Properties map = new Properties();
+
+  public PropertyResourceBundle(InputStream in) throws IOException {
+    map.load(in);
+  }
+
+  public Object handleGetObject(String key) {
+    return map.get(key);
+  }
+}