Getting NumberFormatException while Converting character String to Integer

Question

Getting NumberFormatException while Converting String to Integer and trying to print it.

My code:

BufferedReader bur=new BufferedReader (new InputStreamReader(System.in));   
String s=bur.readLine();        

int a=Integer.parseInt(s);
System.out.println(a);

input-rakib

Please take the [Tour](https://stackoverflow.com/tour), read [How To Ask](https://stackoverflow.com/help/how-to-ask) and create an [MCVE](https://stackoverflow.com/help/mcve). Have you consulted your [Rubber Duck](https://ericlippert.com/2014/03/05/how-to-debug-small-programs/)? — Hermann Döppes, Jan 15 '17 at 18:08
What's your input from `bur`? Could you print `s` and share it with us? — Mureinik, Jan 15 '17 at 18:09
That means that `s` is a set of characters like this : "characters" — Null, Jan 15 '17 at 18:09
I suppose you use Java so it would be a good idea to use this Tag. — Sascha, Jan 15 '17 at 18:12
Possible duplicate of [number format exception](http://stackoverflow.com/questions/5604532/number-format-exception) — Joe C, Jan 15 '17 at 18:56
@ChaiT.Rex That code works fine for specific input string , try to input string "FOOBAR" and it will result NumberFormatException — Oghli, Jan 15 '17 at 22:20
i was inputting character string like "rakib" . i wanted to convert character string into binary — Emranul Haque Rakib, Jan 16 '17 at 10:08
@EmranulHaqueRakib _character string into binary_. What is that supposed to mean? The integer value of a character as binary digit? Then you should have a look at `Character.digit()` and `Integer.toBinaryString()` — Würgspaß, Jan 16 '17 at 10:47
@EmranulHaqueRakib ok, then I think you should edit your question, so that others get the right idea and do not have to read all these comments — Würgspaß, Jan 16 '17 at 13:13
Possible duplicate of [What is a NumberFormatException and how can I fix it?](http://stackoverflow.com/questions/39849984/what-is-a-numberformatexception-and-how-can-i-fix-it) — xenteros, Jan 25 '17 at 06:45

score 0 · Answer 1 · answered Jan 16 '17 at 12:49

You can get chars from String, than can obtain integer value for each char as below

BufferedReader bur=new BufferedReader (new InputStreamReader(System.in));   
String str = bur.readLine();   
char[] chars = str.toCharArray();
for(char c: chars){
    System.out.println((int)c);
}

score 0 · Accepted Answer · answered Jan 16 '17 at 13:04

To print out the numerical vaĺue of each character of a text input to binary digit, replace your last two lines with this:

for (int i=0; i<s.length(); i++) {
    int charValueAsInt = (int)s.charAt(i);
    System.out.println(Integer.toBinaryString(charValueAsInt)); 
}

Retrieve the char value of each character, convert it to int (widening conversion) and then convert to binary digit.

Getting NumberFormatException while Converting character String to Integer

2 Answers2