8300863: Remove C-style array declarations in java.io

Reviewed-by: alanb, rriggs, darcy, iris

src/java.base/share/classes/java/io/BufferedOutputStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -48,7 +48,7 @@ public class BufferedOutputStream extends FilterOutputStream {
     /**
      * The internal buffer where data is stored.
      */
-    protected byte buf[];
+    protected byte[] buf;
 
     /**
      * The number of valid bytes in the buffer. This value is always

src/java.base/share/classes/java/io/BufferedWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -73,8 +73,9 @@ public class BufferedWriter extends Writer {
 
     private Writer out;
 
-    private char cb[];
-    private int nChars, nextChar;
+    private char[] cb;
+    private int nChars;
+    private int nextChar;
     private final int maxChars;  // maximum number of buffers chars
 
     /**

src/java.base/share/classes/java/io/ByteArrayInputStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -53,7 +53,7 @@ public class ByteArrayInputStream extends InputStream {
      * stream;  element {@code buf[pos]} is
      * the next byte to be read.
      */
-    protected byte buf[];
+    protected byte[] buf;
 
     /**
      * The index of the next character to read from the input stream buffer.

src/java.base/share/classes/java/io/ByteArrayOutputStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -51,7 +51,7 @@ public class ByteArrayOutputStream extends OutputStream {
     /**
      * The buffer where data is stored.
      */
-    protected byte buf[];
+    protected byte[] buf;
 
     /**
      * The number of valid bytes in the buffer.

src/java.base/share/classes/java/io/CharArrayWriter.java

@@ -44,7 +44,7 @@ public class CharArrayWriter extends Writer {
     /**
      * The buffer where data is stored.
      */
-    protected char buf[];
+    protected char[] buf;
 
     /**
      * The number of chars in the buffer.

src/java.base/share/classes/java/io/File.java

@@ -1216,7 +1216,7 @@ public class File
      * @see java.nio.file.Files#newDirectoryStream(Path,String)
      */
     public String[] list(FilenameFilter filter) {
-        String names[] = normalizedList();
+        String[] names = normalizedList();
         if ((names == null) || (filter == null)) {
             return names;
         }
@@ -1309,7 +1309,7 @@ public class File
      * @see java.nio.file.Files#newDirectoryStream(Path,String)
      */
     public File[] listFiles(FilenameFilter filter) {
-        String ss[] = normalizedList();
+        String[] ss = normalizedList();
         if (ss == null) return null;
         ArrayList<File> files = new ArrayList<>();
         for (String s : ss)
@@ -1347,7 +1347,7 @@ public class File
      * @see java.nio.file.Files#newDirectoryStream(Path,java.nio.file.DirectoryStream.Filter)
      */
     public File[] listFiles(FileFilter filter) {
-        String ss[] = normalizedList();
+        String[] ss = normalizedList();
         if (ss == null) return null;
         ArrayList<File> files = new ArrayList<>();
         for (String s : ss) {

src/java.base/share/classes/java/io/PipedReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -54,7 +54,7 @@ public class PipedReader extends Reader {
     /**
      * The circular buffer into which incoming data is placed.
      */
-    char buffer[];
+    char[] buffer;
 
     /**
      * The index of the position in the circular buffer at which the
@@ -100,7 +100,6 @@ public class PipedReader extends Reader {
         connect(src);
     }
 
-
     /**
      * Creates a {@code PipedReader} so
      * that it is not yet {@linkplain #connect(java.io.PipedWriter)

src/java.base/share/classes/java/io/StreamTokenizer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1995, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -68,7 +68,7 @@ public class StreamTokenizer {
     private Reader reader = null;
     private InputStream input = null;
 
-    private char buf[] = new char[20];
+    private char[] buf = new char[20];
 
     /**
      * The next character to be considered by the nextToken method.  May also
@@ -91,7 +91,7 @@ public class StreamTokenizer {
     private boolean slashSlashCommentsP = false;
     private boolean slashStarCommentsP = false;
 
-    private byte ctype[] = new byte[256];
+    private final byte[] ctype = new byte[256];
     private static final byte CT_WHITESPACE = 1;
     private static final byte CT_DIGIT = 2;
     private static final byte CT_ALPHA = 4;