你如果要带符号,int n=Integer.parseInt("-5");可以,但+5就不可以了. int n=Integer.parseInt("123ABC",16);
parseInt public static int parseInt(String s) throws NumberFormatException Parses the string argument as a signed decimal integer. The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting integer value is returned, exactly as if the argument and the radix 10 were given as arguments to the parseInt(java.lang.String, int) method. Parameters: s - a String containing the int representation to be parsed Returns: the integer value represented by the argument in decimal. Throws: NumberFormatException - if the string does not contain a parsable integer.
int n=Integer.parseInt("123ABC",16);
public static int parseInt(String s)
throws NumberFormatException
Parses the string argument as a signed decimal integer. The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value. The resulting integer value is returned, exactly as if the argument and the radix 10 were given as arguments to the parseInt(java.lang.String, int) method. Parameters:
s - a String containing the int representation to be parsed
Returns:
the integer value represented by the argument in decimal.
Throws:
NumberFormatException - if the string does not contain a parsable integer.