java - 在Java中如何从字符串中获取整数？

Question

我正在使用以下内容:

int i = Integer.parseInt(args[2]);

还有其他方法可以从字符串中获取整数吗？如果数字确实很小，那么 Byte 和 Char 对象是否提供类似的东西？

Answer 1

是的。有:

Byte.parseByte(s); -- parses a Byte from a String
Short.parseShort(s); -- parses a Short from a String

对于更大的数字，有:

Long.parseLong(s);
-- Float is an imprecise representation of a floating point number using 32 bits
Float.parseFloat(s);
-- Double is an imprecise representation of a floating point number using 64 bits
Double.parseDouble(s);
-- BigIntegers is an integer of arbitrary size as is accurate
new BigInteger(s);
-- BigDecimal is a floating point number of arbitrary size as is accurate
new BigDecimal(s);