java – How could I count the number of times the + sign is repeated in a String data

Question:

I have a String where I store a string of numbers with a + sign before the number. What I want is to be able to count how many + signs there are, in order to know how many numbers and signs there are in the string.

For example:

String cadenanumeros = "+0+4+3+4+5";

Signos+ = 5;

I hope you can help me, in advance, thank you very much for your help and time!

Answer:

There are at least 7 ways to do this with native Java code, aside from some library-based solutions provided in other answers.

I show you here those 7 ways with pure Java:

We will define our test chain:

    String testString = "+0+4+3+4+5";

1. con replace:

    int replace = testString.length() - testString.replace("+", "").length();
    System.out.println("1. Con replace = " + replace);

2. Con replaceAll:

    int replaceAll = testString.replaceAll("[^+]", "").length();
    System.out.println("2. Con replaceAll = " + replaceAll);

3. With replaceAll (2º case):

    int replaceAllCase2 = testString.length() - testString.replaceAll("\\+", "").length();
    System.out.println("3. Con replaceAll (2º caso) = " + replaceAllCase2);

4. Con split:

    int split = testString.split("\\+",-1).length-1;
    System.out.println("4. Con split = " + split);

5. With lambda expressions (as of Java 8):

    long java8 = testString.chars().filter(ch -> ch =='+').count();
    System.out.println("5. Con Lambda (Java8) = " + java8);

6. With lambda expressions (2nd case):

    long java8Case2 = testString.codePoints().filter(ch -> ch =='+').count();
    System.out.println("6. Con Lambda (2º caso) = " + java8Case2);

7. Con stringTokenizer:

    int stringTokenizer = new StringTokenizer(" " +testString + " ", "+").countTokens()-1;
    System.out.println("7. Con stringTokenizer = " + stringTokenizer);

Exit:

1. Con replace = 5
2. Con replaceAll = 5
3. Con replaceAll (2º caso) = 5
4. Con split = 5
5. Con Lambda (Java8) = 5
6. Con Lambda (2º caso) = 5
7. Con stringTokenizer = 5

show

Here you can see a DEMO IN RETTESTER

Fountain

The most popular answer to the Java question: How do I count the number of occurrences of a char in a String? on Stackoverflow in English.

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