numberformatexception - Number format Exception in Java after inputting a string -

i have input character array , inputting number user. @ point getting numberformatexception code is:

public static void main(string[] args) throws ioexception {      bufferedreader br = new bufferedreader(new inputstreamreader(system.in));      int n = integer.parseint(br.readline());     char c[] = new char[n];     (int = 0; < n; i++) {         c[i] = (char) br.read();     }      int k = integer.parseint(br.readline());  } 

at last line it's giving me error.

you numberformatexception if try convert non-valid integer string or empty string integer.

string x = "abcd";  int y = integer.parseint(x);//this raises exception abcd not valid number 

how handle it?

non-technical solution:

try smart man , enter numbers only.

technical solution:

try {  string x = "abcd";   int y = integer.parseint(x); } catch(numberformatexcpetion ne) {   system.out.println("numbers only!");  } 

do not use br.read() read characters. if enter them in seperate lines doesn't consider them.

using system.in.read() instead.

int n = integer.parseint(br.readline()); char c[] = new char[n]; (int = 0; < n; i++) {     char ch;     {         ch = (char) system.in.read();         } while (ch != '\n');     c[i] = ch;     }  int k = integer.parseint(br.readline());