[英]String.format() and hex numbers in Java
I'm trying to figure out why String.format()
is behaving the way it does. 我试图找出为什么
String.format()
的行为方式。
Context: Systems programming class, writing an assembler. 上下文:系统编程类,编写汇编程序。
There is a 5 character hex field in the object file, which I am creating from a value. 目标文件中有一个5字符的十六进制字段,我从一个值创建。
Tried using: String.format("%05X", decInt);
尝试使用:
String.format("%05X", decInt);
This works as intended for positive numbers (11 -> 0000B
) However it fails for negative numbers (-1 -> FFFFFFFF
instead of FFFFF
) 这适用于正数(11 - >
0000B
)但是它不能用于负数(-1 - > FFFFFFFF
而不是FFFFF
)
I suppose I could just take a substring of the last 5 characters, but I would still like to figure out why it behaves this way. 我想我可以只取最后5个字符的子字符串,但我还是想弄清楚它为什么会这样。
The width used in format is always a minimum width. 格式中使用的宽度始终是最小宽度。 In this case, instead of using sub string operations I would suggest:
在这种情况下,我建议不要使用子字符串操作:
String.format("%05X", decInt & 0xFFFFF);
Format width only works to create a minimum number of digits, and only has effect on leading zeroes. 格式宽度仅适用于创建最小位数,并且仅对前导零有影响。
Instead of substring, you could use a bit mask: 您可以使用位掩码代替子字符串:
String.format("%05X", decInt & 0x0FFFFF)
By the way, 11
-> 0000B
, not 0000A
as claimed in your question. 顺便说一句,
11
- > 0000B
,而不是你问题中声称的0000A
。
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