Fixes some warnings

pom.xml

@@ -101,7 +101,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>

src/main/java/net/knarcraft/ffmpegconverter/Main.java

@@ -156,7 +156,7 @@ class Main {
         int videoStreamIndex = -1;
 
         try {
-            if (input.size() > 0) {
+            if (!input.isEmpty()) {
                 audioStreamIndex = Integer.parseInt(input.get(0));
             }
             if (input.size() > 1) {
@@ -191,7 +191,7 @@ class Main {
         int forcedSubtitleIndex = -1;
         String subtitleNameFilter = "";
 
-        if (input.size() > 0) {
+        if (!input.isEmpty()) {
             audioLanguage = ListUtil.getListFromCommaSeparatedString(input.get(0));
         }
         if (input.size() > 1) {
@@ -247,7 +247,7 @@ class Main {
     private static String getChoice(String prompt) throws IOException {
         OutputUtil.println(prompt);
         String choice = "";
-        while (choice.equals("")) {
+        while (choice.isEmpty()) {
             OutputUtil.println("Your input: ");
             choice = READER.nextLine();
         }

src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java

@@ -37,7 +37,7 @@ public abstract class AbstractConverter implements Converter {
             audioFormats = FileUtil.readFileLines("audio_formats.txt");
             videoFormats = FileUtil.readFileLines("video_formats.txt");
         } catch (IOException e) {
-            e.printStackTrace();
+            System.out.println("Unable to read audio and/or video formats from internal files.");
             System.exit(1);
         }
     }
@@ -159,7 +159,7 @@ public abstract class AbstractConverter implements Converter {
         AudioStream audioStream = null;
         if (audioStreams.size() > n) {
             audioStream = audioStreams.get(n);
-        } else if (audioStreams.size() > 0) {
+        } else if (!audioStreams.isEmpty()) {
             audioStream = audioStreams.get(0);
         }
         return audioStream;
@@ -180,7 +180,7 @@ public abstract class AbstractConverter implements Converter {
         SubtitleStream subtitleStream = null;
         if (subtitleStreams.size() > n) {
             subtitleStream = subtitleStreams.get(n);
-        } else if (subtitleStreams.size() > 0) {
+        } else if (!subtitleStreams.isEmpty()) {
             subtitleStream = subtitleStreams.get(0);
         }
         return subtitleStream;
@@ -201,7 +201,7 @@ public abstract class AbstractConverter implements Converter {
         VideoStream videoStream = null;
         if (videoStreams.size() > n) {
             videoStream = videoStreams.get(n);
-        } else if (videoStreams.size() > 0) {
+        } else if (!videoStreams.isEmpty()) {
             videoStream = videoStreams.get(0);
         }
         return videoStream;

src/main/java/net/knarcraft/ffmpegconverter/parser/ConverterArgument.java

@@ -61,7 +61,7 @@ public class ConverterArgument {
      * @return <p>True if the argument is valid. False otherwise.</p>
      */
     public boolean testArgumentValue(String value) {
-        if (value.length() == 0) {
+        if (value.isEmpty()) {
             return !valueRequired;
         }
         if (valueRequired && value.startsWith("-")) {

src/main/java/net/knarcraft/ffmpegconverter/utility/FFMpegHelper.java

@@ -110,7 +110,7 @@ public final class FFMpegHelper {
         StringBuilder output = new StringBuilder();
         while (process.isAlive()) {
             String read = readProcess(processReader, spacer);
-            if (!read.equals("")) {
+            if (!read.isEmpty()) {
                 if (write) {
                     OutputUtil.println(read);
                 } else {
@@ -339,7 +339,7 @@ public final class FFMpegHelper {
     private static String readProcess(BufferedReader reader, String spacer) throws IOException {
         String line;
         StringBuilder text = new StringBuilder();
-        while (reader.ready() && (line = reader.readLine()) != null && !line.equals("") && !line.equals("\n")) {
+        while (reader.ready() && (line = reader.readLine()) != null && !line.isEmpty() && !line.equals("\n")) {
             text.append(line).append(spacer);
         }
         return text.toString().trim();

src/main/java/net/knarcraft/ffmpegconverter/utility/OutputUtil.java

@@ -32,7 +32,7 @@ public final class OutputUtil {
      * @throws IOException <p>If a write is not possible.</p>
      */
     public static void println(String input) throws IOException {
-        if (!input.equals("")) {
+        if (!input.isEmpty()) {
             writer.write(input);
         }
         println();

src/main/java/net/knarcraft/ffmpegconverter/utility/Parser.java

@@ -193,7 +193,7 @@ public final class Parser {
      * @return <p>True if the string builder is non empty.</p>
      */
     private static boolean isNotEmpty(StringBuilder builder) {
-        return !builder.toString().trim().equals("");
+        return !builder.toString().trim().isEmpty();
     }
 
 }

src/test/java/net/knarcraft/ffmpegconverter/converter/AnimeConverterTest.java

@@ -1,9 +1,6 @@
 package net.knarcraft.ffmpegconverter.converter;
 
 import org.junit.Before;
-import org.junit.Test;
-
-import static org.junit.Assert.assertEquals;
 
 public class AnimeConverterTest {
 
@@ -14,9 +11,4 @@ public class AnimeConverterTest {
                 false, -1, -1, "");
     }
 
-    @Test
-    public void weirdTest() {
-        assertEquals(0, 0);
-    }
-
 }