CODEWITHSUNDEEP
javafor-loopwhile-loop
Daniyar Serikov
Daniyar Serikov

Reputation: 31

How to count how many matches of 2 characters found in string?

My task is to read how many characters match in first string and in second string and so on.

for loop checks all the string but inside while loop works until character of string not equal to '|';

  for(int i = 0;i<blobs.length();i++){
       while(blobs.charAt(i)=='|'){
    if(blobs.charAt(i)==pattern.charAt(0) && blobs.charAt(i+1)==pattern.charAt(1)){
      a++;


        }
       }
     }

Example of inputs and output -

in: bc;bcdefbcbebc|abcdebcfgsdf|cbdbesfbcy|1bcdef23423bc32

out: 3|2|1|2|8

How to count until ' |' and start count again ?

Reader

public static void main(String[] args) throws IOException {
InputStreamReader reader = new InputStreamReader(System.in, StandardCharsets.UTF_8);
BufferedReader in = new BufferedReader(reader);
String line;
while ((line = in.readLine()) != null) {
  String[] splittedInput = line.split(";");
  String pattern = splittedInput[0];
  String blobs = splittedInput[1];
  Main.doSomething(pattern, blobs);
   }
 }

Upvotes: 1

Views: 86

Answers (2)

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79445

You can do it as follows:

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

public class RegExTest {
    public static void main(String args[]) {
        String str="bcdefbcbebc|abcdebcfgsdf|cbdbesfbcy|1bcdef23423bc32";
        String searchStr="bc";
        String []substrs=str.split("\\|"); //Split the input String at each '|'
        StringBuilder sb=new StringBuilder();
        Pattern pattern;
        Matcher matcher;
        int numberOfMatches;
        int sum=0;
        for(String s:substrs) {
            pattern=Pattern.compile(searchStr);
            matcher = pattern.matcher(s);
            numberOfMatches=0;        
            while (matcher.find()) {
                numberOfMatches++;
            }
            sb.append(String.valueOf(numberOfMatches)+"|");
            sum+=numberOfMatches;
        }
        sb.append(String.valueOf(sum));
        String out=sb.toString();
        System.out.println(out);
    }
}

Output:

3|2|1|2|8

Upvotes: 2

Guilherme Melo
Guilherme Melo

Reputation: 199

I think this will help you, transform it in methods:

public static void main(String[] args) {
    String value = "bcdefbcbebc|abcdebcfgsdf|cbdbesfbcy|1bcdef23423bc32";
    //3|2|1|2|8
    String[] splited = value.split("\\|");
    String toFind = "bc";
    String out = "";

    int total = 0;
    for(String s: splited) {
        int subTotal = 0;
        while(s.contains(toFind)) {
            s = s.replaceFirst(toFind, "");
            subTotal++;
        }
        total += subTotal;

        out += subTotal + "|";
    }

    out += total;
    System.out.println(out);
}

Upvotes: 0

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