StandardCharsets used where possible; try-with-resources used; cleanup

src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java

@@ -9,6 +9,7 @@ import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 import org.jetbrains.java.decompiler.util.InterpreterUtil;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.jar.JarOutputStream;
 import java.util.jar.Manifest;
@@ -238,7 +239,7 @@ public class ConsoleDecompiler implements IBytecodeProvider, IResultSaver {
       ZipOutputStream out = mapArchiveStreams.get(file);
       out.putNextEntry(new ZipEntry(entryName));
       if (content != null) {
-        out.write(content.getBytes("UTF-8"));
+        out.write(content.getBytes(StandardCharsets.UTF_8));
       }
     }
     catch (IOException ex) {

test/org/jetbrains/java/decompiler/DecompilerTestFixture.java

@@ -8,6 +8,7 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
@@ -106,7 +107,7 @@ public class DecompilerTestFixture {
 
   private static String getContent(File expected) {
     try {
-      return new String(InterpreterUtil.getBytes(expected), "UTF-8").replace("\r\n", "\n");
+      return new String(InterpreterUtil.getBytes(expected), StandardCharsets.UTF_8).replace("\r\n", "\n");
     }
     catch (IOException e) {
       throw new RuntimeException(e);