Eliminate some warnings from IntelliJ inspections. There are still quite a few but they are all harmless.

src/com/google/bitcoin/core/Base58.java

@@ -48,8 +48,8 @@ public class Base58 {
         }
         s.insert(0, ALPHABET.charAt(bi.intValue()));
         // Convert leading zeros too.
-        for (int i = 0; i < input.length; i++) {
+        for (byte anInput : input) {
-            if (input[i] == 0)
+            if (anInput == 0)
                 s.insert(0, ALPHABET.charAt(0));
             else
                 break;

src/com/google/bitcoin/core/NetworkConnection.java

@@ -52,7 +52,7 @@ public class NetworkConnection {
     private final OutputStream out;
     private final InputStream in;
     // The IP address to which we are connecting.
-    private InetAddress remoteIp;
+    private final InetAddress remoteIp;
     private boolean usesChecksumming;
     private final NetworkParameters params;
     static final private boolean PROTOCOL_LOG = false;
@@ -82,7 +82,7 @@ public class NetworkConnection {
         // And get one back ...
         readMessage();
         // Switch to the new protocol version.
-        int peerVersion = (int) ver.clientVersion;
+        int peerVersion = ver.clientVersion;
         LOG("Connected to peer, version is " + peerVersion + ", services=" + Long.toHexString(
                 ver.localServices) + ", time=" + new Date(ver.time.longValue() * 1000).toString());
         // BitCoinJ is a client mode implementation. That means there's not much point in us talking to other client

src/com/google/bitcoin/core/Peer.java

@@ -44,7 +44,7 @@ public class Peer {
     private CountDownLatch chainCompletionLatch;
     // When we want to download a block or transaction from a peer, the InventoryItem is put here whilst waiting for
     // the response. Synchronized on itself.
-    private List<GetDataFuture<Block>> pendingGetBlockFutures;
+    private final List<GetDataFuture<Block>> pendingGetBlockFutures;
 
     /**
      * Construct a peer that handles the given network connection and reads/writes from the given block chain. Note that
@@ -217,8 +217,8 @@ public class Peer {
     // decide whether to wait forever, wait for a short while or check later after doing other work.
     private class GetDataFuture<T extends Message> implements Future<T> {
         private boolean cancelled;
-        private InventoryItem item;
+        private final InventoryItem item;
-        private CountDownLatch latch;
+        private final CountDownLatch latch;
         private T result;
 
         GetDataFuture(InventoryItem item) {

src/com/google/bitcoin/core/Script.java

@@ -51,12 +51,12 @@ public class Script {
     private int cursor;
     
     // The stack consists of an ordered series of data buffers growing from zero up.
-    private Stack<byte[]> stack;
+    private final Stack<byte[]> stack;
     // The program is a set of byte[]s where each element is either [opcode] or [data, data, data ...]
     private List<byte[]> chunks;
     private boolean tracing;
     byte[] programCopy;      // TODO: remove this
-    private NetworkParameters params;
+    private final NetworkParameters params;
 
     /** Concatenates two scripts to form a new one. This is used when verifying transactions. */
     public static Script join(Script a,  Script b) throws ScriptException {
@@ -321,6 +321,7 @@ public class Script {
         pushBool(true);
     }
 
+    @SuppressWarnings({"SameParameterValue"})
     private void pushBool(boolean val) {
         stack.push(new byte[] { val ? (byte)1 : (byte)0 });
     }

src/com/google/bitcoin/core/Transaction.java

@@ -254,6 +254,7 @@ public class Transaction extends Message implements Serializable {
      * @param hashType This should always be set to SigHash.ALL currently. Other types are unused.
      * @param wallet A wallet is required to fetch the keys needed for signing.
      */
+    @SuppressWarnings({"SameParameterValue"})
     public void signInputs(SigHash hashType, Wallet wallet) throws ScriptException {
         assert inputs.size() > 0;
         assert outputs.size() > 0;

src/com/google/bitcoin/core/Utils.java

@@ -28,13 +28,14 @@ import java.security.NoSuchAlgorithmException;
  * A collection of various utility methods that are helpful for working with the BitCoin protocol.
  * To enable debug logging from the library, run with -Dbitcoinj.logging=true on your command line.
  */
+@SuppressWarnings({"SameParameterValue"})
 public class Utils {
     /** How many nanocoins there are in a BitCoin. */
     public static final BigInteger COIN = new BigInteger("100000000", 10);
     /** How many nanocoins there are in 0.01 BitCoins. */
     public static final BigInteger CENT = new BigInteger("1000000", 10);
 
-    private static boolean logging;
+    private static final boolean logging;
 
     static {
         logging = Boolean.parseBoolean(System.getProperty("bitcoinj.logging", "false"));
@@ -98,8 +99,7 @@ public class Utils {
             MessageDigest digest = MessageDigest.getInstance("SHA-256");
             digest.update(input, offset, length);
             byte[] first = digest.digest();
-            byte[] second = digest.digest(first);
+            return digest.digest(first);
-            return second;
         } catch (NoSuchAlgorithmException e) {
             throw new RuntimeException(e);  // Cannot happen.
         }
@@ -115,8 +115,7 @@ public class Utils {
             digest.update(input1, offset1, length1);
             digest.update(input2, offset2, length2);
             byte[] first = digest.digest();
-            byte[] second = digest.digest(first);
+            return digest.digest(first);
-            return second;
         } catch (NoSuchAlgorithmException e) {
             throw new RuntimeException(e);  // Cannot happen.
         }
@@ -154,7 +153,7 @@ public class Utils {
         return ((bytes[offset++] & 0xFFL) <<  0) |
                ((bytes[offset++] & 0xFFL) <<  8) |
                ((bytes[offset++] & 0xFFL) << 16) |
-               ((bytes[offset++] & 0xFFL) << 24);
+               ((bytes[offset] & 0xFFL) << 24);
     }
     
     public static long readUint32BE(byte[] bytes, int offset) {