Add doc + refactor + fix formatting

java/org/rocksdb/Iterator.java

@@ -7,70 +7,70 @@ package org.rocksdb;
 
 public class Iterator {
   private long nativeHandle_;
-  
+
   public Iterator(long nativeHandle) {
     nativeHandle_ = nativeHandle;
   }
-  
+
   public boolean isValid() {
     assert(isInitialized());
     return isValid0(nativeHandle_);
   }
-  
+
   public void seekToFirst() {
     assert(isInitialized());
     seekToFirst0(nativeHandle_);
   }
-  
+
   public void seekToLast() {
     assert(isInitialized());
     seekToLast0(nativeHandle_);
   }
-  
+
   public void next() {
     assert(isInitialized());
     next0(nativeHandle_);
   }
-  
+
   public void prev() {
     assert(isInitialized());
     prev0(nativeHandle_);
   }
-  
+
   public byte[] key() {
     assert(isInitialized());
     return key0(nativeHandle_);
   }
-  
+
   public byte[] value() {
     assert(isInitialized());
     return value0(nativeHandle_);
   }
-  
+
   public void seek(byte[] target) {
     assert(isInitialized());
     seek0(nativeHandle_, target, target.length);
   }
-  
+
   public void status(){
     assert(isInitialized());
     status0(nativeHandle_);
   }
-  
+
   public synchronized void close() {
     if(nativeHandle_ != 0) {
       close0(nativeHandle_);
     }
   }
-  
+
   @Override protected void finalize() {
     close();
   }
-  
+
   private boolean isInitialized() {
     return (nativeHandle_ != 0);
   }
-  
+
   private native boolean isValid0(long handle);
   private native void close0(long handle);
   private native void seekToFirst0(long handle);
@@ -81,4 +81,4 @@ public class Iterator {
   private native byte[] value0(long handle);
   private native void seek0(long handle, byte[] target, int targetLen);
   private native void status0(long handle);
-}
+}