CODEWITHSUNDEEP
javamemory
user1522860
user1522860

Reputation: 123

Why is my .class file bigger when I change my int array to a char array?

So I have a line of code in my file, that reads

char[] arr = new char[256];

However, when I change this to

int[] arr = new int[256];

the class file shrinks by .01 Kb. Why is this?

Upvotes: 1

Views: 98

Answers (2)

user2638922
user2638922

Reputation:

Its probably because the compiler generates a symbol that is a few characters shorter. Just like in the .java file the first line will create a bigger file because it has more characters.

If you open the .class in vim you will see the following for an int array.

Êþº¾^@^@^@2^@^O
^@^C^@^L^G^@^M^G^@^N^A^@^F<init>^A^@^C()V^A^@^DCode^A^@^OLineNumberTable^A^@^Dmain^A^@^V([Ljava/lang/String;)V^A^@
SourceFile^A^@!JFileChooserDisableDirectory.java^L^@^D^@^E^A^@^\JFileChooserDisableDirectory^A^@^Pjava/lang/Object^@!^@^B^@^C^@^@^@^@^@^B^@^A^@^D^@^E^@^A^@^F^@^@^@^]^@^A^@^A^@^@^@^E*·^@^A±^@^@^@^A^@^G^@^@^@^F^@^A^@^@^@^A^@  ^@^H^@  ^@^A^@^F^@^@^@"^@^A^@^B^@^@^@^F^P
¼
L±^@^@^@^A^@^G^@^@^@
^@^B^@^@^@^D^@^E^@^E^@^A^@
^@^@^@^B^@^K

Here is the char array .class file.

Êþº¾^@^@^@2^@^O
^@^C^@^L^G^@^M^G^@^N^A^@^F<init>^A^@^C()V^A^@^DCode^A^@^OLineNumberTable^A^@^Dmain^A^@^V([Ljava/lang/String;)V^A^@
SourceFile^A^@!JFileChooserDisableDirectory.java^L^@^D^@^E^A^@^\JFileChooserDisableDirectory^A^@^Pjava/lang/Object^@!^@^B^@^C^@^@^@^@^@^B^@^A^@^D^@^E^@^A^@^F^@^@^@^]^@^A^@^A^@^@^@^E*·^@^A±^@^@^@^A^@^G^@^@^@^F^@^A^@^@^@^A^@  ^@^H^@  ^@^A^@^F^@^@^@"^@^A^@^B^@^@^@^F^P
¼^EL±^@^@^@^A^@^G^@^@^@
^@^B^@^@^@^D^@^E^@^E^@^A^@
^@^@^@^B^@^K

Using TextDiff you can see the differences in the code.

Upvotes: 4

chrylis -cautiouslyoptimistic-
chrylis -cautiouslyoptimistic-

Reputation: 77187

Probably just because the symbol for the type is a tad bit shorter.

Upvotes: 1

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