Java String Tokens
Hint
Three issues need to be noticed in order to solve all cases:
1) Trim the string
2) handle string.length() > 400000 => don't print anything
3) handle string.length() == 0 => print "0"
Problem
Given a string, , matching the regular expression [A-Za-z !,?._'@]+, split the string into tokens. We define a token to be one or more consecutive English alphabetic letters. Then, print the number of tokens, followed by each token on a new line.
Note: You may find the String.split method helpful in completing this challenge.
Input Style
A single string,s .
Constraints
1<=length of s <=4.10^5
s is composed of any of the following: English alphabetic letters, blank spaces, exclamation points (!), commas (,), question marks (?), periods (.), underscores (_), apostrophes ('), and at symbols (@).
Output Format
On the first line, print an integer,n , denoting the number of tokens in string s (they do not need to be unique). Next, print each of the n tokens on a new line in the same order as they appear in input string.
Sample Input
He is a very very good boy, isn't he?
Sample Output
10
He
is
a
very
very
good
boy
isn
t
he
Explanation
We consider a token to be a contiguous segment of alphabetic characters. There are a total of 10 such tokens in string , and each token is printed in the same order in which it appears in string s .
Recommended: Please try your approach on your integrated development environment (IDE) first, before moving on to the solution.
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Solution
( Java )
import java.io.*;
import java.util.*;
public class Solution {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
scan.useDelimiter("\\Z");
String s = scan.next().trim();
if(s.length()>0){
String[]tokens=s.split("[!,?._'@\\s]+");
System.out.println(tokens.length);
for(String token :tokens){
System.out.println(token);
}
}
else{
System.out.println("0");
scan.close();
}
}
}
If you have any doubts regarding this problem or need the solution in other programming languages then leave a comment down below .
