How to convert binary string to a byte? [duplicate]

Question

there is a string fill with 0 and 1,like String s = "10000000", which length is 8.And how can i transform it to a byte.such as "10000000"===>-128. I try to use Byte.parseByte(s, 2),but get the error "Value out of range. Value:"10000000" Radix:2".So,how can i solve it.

stackoverflow.com/questions/14883428/… , stackoverflow.com/questions/22649348 , stackoverflow.com/questions/29530015/…, stackoverflow.com/questions/28032458 - although if it's homework.. — user2864740
– user2864740, Commented Jun 22, 2016 at 6:10
Did you try using Integer.parseInt(s,2) ? The value you are using is out of bounds for Byte. — vv88
– vv88, Commented Jun 22, 2016 at 6:13

Andreas Fester · Accepted Answer · 2016-06-22 06:12:14Z

1

You need to parse it as an Integer and then cast it to byte:

...
String s = "10000000";
int val = Integer.parseInt(s, 2);
byte b = (byte) val;
System.err.println(b);
...

Output:

-128

answered Jun 22, 2016 at 6:12

Andreas Fester

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1 Comment

Turisla Over a year ago

thank you very much

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