Resolved Idea warnings

Author: javadev

src/main/java/com/github/underscore/Base32.java

@@ -51,7 +51,7 @@ public static String decode(final String encoded) {
     }
 
     private byte[] decodeInternal(final String encoded) {
-        if (encoded.length() == 0) {
+        if (encoded.isEmpty()) {
             return new byte[0];
         }
         int encodedLength = encoded.length();

src/main/java/com/github/underscore/U.java

@@ -23,7 +23,6 @@
  */
 package com.github.underscore;
 
-import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -2069,7 +2068,7 @@ public static long downloadUrl(final String url, final String fileName)
     public static void decompressGzip(final String sourceFileName, final String targetFileName)
             throws IOException {
         try (GZIPInputStream gis =
-                new GZIPInputStream(new FileInputStream(new File(sourceFileName)))) {
+                new GZIPInputStream(new FileInputStream(sourceFileName))) {
             Files.copy(gis, Paths.get(targetFileName));
         }
     }

src/main/java/com/github/underscore/Underscore.java

@@ -1255,7 +1255,7 @@ public static <E> E first(final E... array) {
     }
 
     public static <E> List<E> first(final List<E> list, final int n) {
-        return list.subList(0, Math.min(n < 0 ? 0 : n, list.size()));
+        return list.subList(0, Math.min(Math.max(n, 0), list.size()));
     }
 
     public T first() {
@@ -1273,7 +1273,7 @@ public static <E> E first(final Iterable<E> iterable, final Predicate<E> pred) {
     public static <E> List<E> first(
             final Iterable<E> iterable, final Predicate<E> pred, final int n) {
         List<E> list = filter(newArrayList(iterable), pred);
-        return list.subList(0, Math.min(n < 0 ? 0 : n, list.size()));
+        return list.subList(0, Math.min(Math.max(n, 0), list.size()));
     }
 
     public T first(final Predicate<T> pred) {