java - 当字符串以零结尾时，如何解决NumberFormatException？

Question

I have written code to convert string into int but I'm getting error when string ends with zero '0'.

I have tried this,

int val=Integer.parseInt(s);

Input string,

9876543210

Answer 1

You might be trying to parse a string which does not contain a parsable integer. as document Integer.parseInt(String str) says.

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 '-' ('\-') to indicate a negative value or an ASCII plus sign '+' ('\+') to indicate a positive 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.

Throws: NumberFormatException - if the string does not contain a parsable integer.

With some example we can understand it.

String s = "3t0";
int val=Integer.parseInt(s);
// Will throw exception 

String s = "9876543210"; 
int val=Integer.parseInt(s);
// Will throw an Exception because  9876543210 is not an Integer see the Integer range of values (-2^31 to 2^31-1) 


String s = "433"
int val=Integer.parseInt(s);
// Will successfully parse