int[] outSize = new int[]{bytes, packets};
new byte[] {0, 0, 0, 0}
What does the first line of code mean? What is it doing to size array? How is the second line of code initializing that byte array (if it is at all)?
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1what do you want to know exactlySundeep– Sundeep2018-06-17 05:05:07 +00:00Commented Jun 17, 2018 at 5:05
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int [ ] outsize = new int[10].. i know what that does, but what is { } doing here??ABJ– ABJ2018-06-17 05:05:55 +00:00Commented Jun 17, 2018 at 5:05
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the code is not correct. and will give compilation errorSundeep– Sundeep2018-06-17 05:08:32 +00:00Commented Jun 17, 2018 at 5:08
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well i can compile it with maven ...ABJ– ABJ2018-06-17 05:09:32 +00:00Commented Jun 17, 2018 at 5:09
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then bytes and packets are integers and they are initialized in outSize arraySundeep– Sundeep2018-06-17 05:11:36 +00:00Commented Jun 17, 2018 at 5:11
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2 Answers
We can initialized an array at the time of declaration using the given syntex
int[] outSize = new int[]{5, 9}; //create a Integer array of 2 element named outSize
OR
int bytes = 5, packets =9;
int[] outSize = new int[]{bytes, packets}; //create a Integer array of 2 element named outSize.
there is no difference using both the above statement.
Comments
First line
int[] outSize = new int{ bytes, packets };
This creates an integer (primitive) array with two integer elements, namely bytes and packets.
Second line
new byte[] { 0, 0, 0, 0 }
By itself, this will give you an error (not compile) since it isn't a statement (there's no assignment to a variable anywhere).
If you write
byte[] bytes = new byte[] { 0, 0, 0, 0 };
you are declaring a byte array called bytes with four elements.
Use of {} for array initialization
Refer to chapter 10 (arrays) of the documentation, particularly sections 10.1 and 10.2.
Also worth reading, the primitive data types.
From the above:
int is a 32-bit signed two's complement integer (min value in base 10 is -2^31 and max is 2^31 - 1).
byte is an 8-bit signed two's complement integer (min value in base 10 is -2^7 and max is -2^7 - 1).
What it's doing
The first line uses 64 bits to store two integers.
The second line uses 32 bits to store four bytes.