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8300979: Lazily initialize (byte, char)arr in java.io.DataInputStream

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Reviewed-by: alanb
This commit is contained in:
Per Minborg 2023-03-28 10:58:52 +00:00
parent cddaf686e1
commit 60640a216d
1 changed files with 6 additions and 3 deletions
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9
src/java.base/share/classes/java/io/DataInputStream.java
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@ -46,6 +46,9 @@ import java.util.Objects;
*/
public class DataInputStream extends FilterInputStream implements DataInput {
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
private static final char[] EMPTY_CHAR_ARRAY = new char[0];
/**
* Creates a DataInputStream that uses the specified
* underlying InputStream.
@ -61,8 +64,8 @@ public class DataInputStream extends FilterInputStream implements DataInput {
/**
* working arrays initialized on demand by readUTF
*/
private byte[] bytearr = new byte[80];
private char[] chararr = new char[80];
private byte[] bytearr = EMPTY_BYTE_ARRAY;
private char[] chararr = EMPTY_CHAR_ARRAY;
/**
* Reads some number of bytes from the contained input stream and
@ -573,7 +576,7 @@ loop: while (true) {
byte[] bytearr = null;
char[] chararr = null;
if (in instanceof DataInputStream dis) {
if (dis.bytearr.length < utflen){
if (dis.bytearr.length < utflen) {
dis.bytearr = new byte[utflen*2];
dis.chararr = new char[utflen*2];
}