Clean up other compiler warnings

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -348,20 +348,18 @@ public class WorldEditPlugin extends JavaPlugin //implements TabCompleter
     protected void createDefaultConfiguration(String name) {
         File actual = new File(getDataFolder(), name);
         if (!actual.exists()) {
-            InputStream input = null;
-            try {
-                JarFile file = new JarFile(getFile());
+            try (JarFile file = new JarFile(getFile())) {
                 ZipEntry copy = file.getEntry("defaults/" + name);
                 if (copy == null) throw new FileNotFoundException();
-                input = file.getInputStream(copy);
+                copyDefaultConfig(file.getInputStream(copy), actual, name);
             } catch (IOException e) {
                 getLogger().severe("Unable to read default configuration: " + name);
             }
-            if (input != null) {
-                FileOutputStream output = null;
+        }
+    }
 
-                try {
-                    output = new FileOutputStream(actual);
+    private void copyDefaultConfig(InputStream input, File actual, String name) {
+        try (FileOutputStream output = new FileOutputStream(actual)) {
             byte[] buf = new byte[8192];
             int length;
             while ((length = input.read(buf)) > 0) {
@@ -371,18 +369,6 @@ public class WorldEditPlugin extends JavaPlugin //implements TabCompleter
             getLogger().info("Default configuration file written: " + name);
         } catch (IOException e) {
             getLogger().log(Level.WARNING, "Failed to write default config file", e);
-                } finally {
-                    try {
-                        input.close();
-                    } catch (IOException ignored) {}
-
-                    try {
-                        if (output != null) {
-                            output.close();
-                        }
-                    } catch (IOException ignored) {}
-                }
-            }
         }
     }
 

worldedit-core/src/main/java/com/sk89q/jnbt/ListTagBuilder.java

@@ -97,7 +97,7 @@ public class ListTagBuilder {
      *
      * @return a new builder
      */
-    public static <T extends Tag> ListTagBuilder createWith(T ... entries) {
+    public static ListTagBuilder createWith(Tag... entries) {
         checkNotNull(entries);
 
         if (entries.length == 0) {

worldedit-core/src/main/java/com/sk89q/worldedit/util/FileDialogUtil.java

@@ -85,7 +85,7 @@ public final class FileDialogUtil {
             if (index == -1 || index == path.length() - 1) {
                 return false;
             } else {
-                return exts.contains(path.indexOf(index + 1));
+                return exts.contains(path.substring(index + 1));
             }
         }
 

worldedit-core/src/main/java/com/sk89q/worldedit/world/snapshot/Snapshot.java

@@ -133,9 +133,10 @@ public class Snapshot implements Comparable<Snapshot> {
     public boolean containsWorld(String worldname) {
         try {
             if (file.getName().toLowerCase().endsWith(".zip")) {
-                ZipFile entry = new ZipFile(file);
+                try (ZipFile entry = new ZipFile(file)) {
                     return (entry.getEntry(worldname) != null
                             || entry.getEntry(worldname + "/level.dat") != null);
+                }
             } else if (file.getName().toLowerCase().endsWith(".tar.bz2")
                     || file.getName().toLowerCase().endsWith(".tar.gz")
                     || file.getName().toLowerCase().endsWith(".tar")) {