Wallet: remove references to deprecated autosaveToFile()

core/src/main/java/org/bitcoinj/wallet/Wallet.java

@@ -178,7 +178,7 @@
  * auto-save feature that simplifies this for you although you're still responsible for manually triggering a save when
  * your app is about to quit because the auto-save feature waits a moment before actually committing to disk to avoid IO
  * thrashing when the wallet is changing very fast (e.g. due to a block chain sync). See
- * {@link Wallet#autosaveToFile(File, long, TimeUnit, WalletFiles.Listener)}
+ * {@link Wallet#autosaveToFile(File, Duration, WalletFiles.Listener)}
  * for more information about this.</p>
  */
 public class Wallet extends BaseTaggableObject
@@ -1051,7 +1051,7 @@ public boolean importKey(ECKey key) {
 
     /**
      * Imports the given keys to the wallet.
-     * If {@link Wallet#autosaveToFile(File, long, TimeUnit, WalletFiles.Listener)}
+     * If {@link Wallet#autosaveToFile(File, Duration, WalletFiles.Listener)}
      * has been called, triggers an auto save bypassing the normal coalescing delay and event handlers.
      * Returns the number of keys added, after duplicates are ignored. The onKeyAdded event will be called for each key
      * in the list that was not already present.
@@ -1834,7 +1834,7 @@ public RiskAnalysis.Analyzer getRiskAnalyzer() {
      * In this way disk IO can be rate limited. It's a good idea to set this as otherwise the wallet can change very
      * frequently, e.g. if there are a lot of transactions in it or during block sync, and there will be a lot of redundant
      * writes. Note that when a new key is added, that always results in an immediate save regardless of
-     * delayTime. <b>You should still save the wallet manually using {@link Wallet#saveToFile(File)} when your program
+     * delay. <b>You should still save the wallet manually using {@link Wallet#saveToFile(File)} when your program
      * is about to shut down as the JVM will not wait for the background thread.</b></p>
      *
      * <p>An event listener can be provided. It will be called on a background thread
@@ -1868,7 +1868,7 @@ public WalletFiles autosaveToFile(File f, long delayTime, TimeUnit timeUnit, @Nu
     /**
      * <p>
      * Disables auto-saving, after it had been enabled with
-     * {@link Wallet#autosaveToFile(File, long, TimeUnit, WalletFiles.Listener)}
+     * {@link Wallet#autosaveToFile(File, Duration, WalletFiles.Listener)}
      * before. This method blocks until finished.
      * </p>
      */

core/src/test/java/org/bitcoinj/wallet/WalletTest.java

@@ -101,7 +101,6 @@
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -1708,7 +1707,7 @@ public void autosaveImmediate() throws Exception {
         File f = File.createTempFile("bitcoinj-unit-test", null);
         Sha256Hash hash1 = Sha256Hash.of(f);
         // Start with zero delay and ensure the wallet file changes after adding a key.
-        wallet.autosaveToFile(f, 0, TimeUnit.SECONDS, null);
+        wallet.autosaveToFile(f, Duration.ZERO, null);
         ECKey key = wallet.freshReceiveKey();
         Sha256Hash hash2 = Sha256Hash.of(f);
         assertFalse("Wallet not saved after generating fresh key", hash1.equals(hash2));  // File has changed.
@@ -1729,7 +1728,7 @@ public void autosaveDelayed() throws Exception {
         final CountDownLatch latch = new CountDownLatch(3);
         File f = File.createTempFile("bitcoinj-unit-test", null);
         Sha256Hash hash1 = Sha256Hash.of(f);
-        wallet.autosaveToFile(f, 1, TimeUnit.SECONDS,
+        wallet.autosaveToFile(f, Duration.ofSeconds(1),
                 new WalletFiles.Listener() {
                     @Override
                     public void onBeforeAutoSave(File tempFile) {