Tokenization of input string without a delimiter

Question

I have String some like this (Customer.Activity == "Car Loan") i am using below code to split the String using StringTokenizer in java

import java.util.ArrayList;
import java.util.StringTokenizer;

public class StringTokenizerClass {

    public ArrayList<String> stringTokenizer(String str) {


        StringTokenizer Tokenizer = new StringTokenizer(str);

        ArrayList<String> tokenList = new ArrayList<String>();

        while (Tokenizer.hasMoreTokens()) {
            tokenList.add(Tokenizer.nextToken());
        }

        return (tokenList);
    }

}

public class StringTokenizerMain {

    public static void main(String[] args) {

        String input = "(Customer.Activity == \"Car Loan\")";

        StringTokenizerClass st = new StringTokenizerClass();

        for (int i = 0; i < st.stringTokenizer(input).size(); i++) {
            System.out.println(st.stringTokenizer(input).get(i));
        }

    }

}

And i am getting output like below

("Customer.Activity"
==
"Car
Loan")

But i am trying to achieve output like below

Can you suggest me way how can i achieve above output

Answer 1

If you are fine with a solution using Java regex API, given below the one which meets your requirement precisely:

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        List<String> tokenList = new ArrayList<String>();
        String str = "(\"Customer.Activity\" == \"Car Loan\")";
        Pattern pattern = Pattern.compile("[(\")]|\\w+.\\w+|==");
        Matcher matcher = pattern.matcher(str);
        while (matcher.find()) {
            tokenList.add(matcher.group());
        }

        for (String token : tokenList) {
            System.out.println(token);
        }
    }
}

Output:

(
"
Customer.Activity
"
==
"
Car Loan
"
)