8273528: Avoid ByteArrayOutputStream.toByteArray when converting stream to String

Reviewed-by: bpb, xuelei, serb, aivanov

Author: turbanoff

src/java.base/share/classes/sun/security/util/BitArray.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2021, 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
@@ -261,7 +261,7 @@ public String toString() {
             out.write(get(i) ? '1' : '0');
         }
 
-        return new String(out.toByteArray());
+        return out.toString();
 
     }
 

src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java

@@ -228,7 +228,7 @@ private String readNullTerminatedString(Charset charset, int maxLen) throws IOEx
         if (b != 0) {
             throw new IIOException("Found non null terminated string");
         }
-        return new String(baos.toByteArray(), charset);
+        return baos.toString(charset);
     }
 
     private void readHeader() throws IIOException {

src/java.desktop/share/classes/sun/awt/DebugSettings.java

@@ -134,7 +134,7 @@ public String toString() {
             String value = props.getProperty(key, "");
             pout.println(key + " = " + value);
         }
-        return new String(bout.toByteArray());
+        return bout.toString();
     }
 
     /*

src/java.desktop/share/classes/sun/awt/datatransfer/DataTransferer.java

@@ -945,10 +945,9 @@ public byte[] translateTransferable(Transferable contents,
                 }
 
                 if (DataFlavorUtil.isFlavorCharsetTextType(flavor) && isTextFormat(format)) {
-                    byte[] bytes = bos.toByteArray();
                     String sourceEncoding = DataFlavorUtil.getTextCharset(flavor);
                     return translateTransferableString(
-                               new String(bytes, sourceEncoding),
+                               bos.toString(sourceEncoding),
                                format);
                 }
                 theByteArray = bos.toByteArray();