java - Checking if a string contains a dot

Java - Checking if a string contains a dot

To check if a Java string contains a dot (period), you can use the contains method or the indexOf method. Here's an example:

Using contains method:

public class DotChecker { public static void main(String[] args) { String testString1 = "example.com"; String testString2 = "noDot"; boolean containsDot1 = containsDot(testString1); boolean containsDot2 = containsDot(testString2); System.out.println("Does '" + testString1 + "' contain a dot? " + containsDot1); System.out.println("Does '" + testString2 + "' contain a dot? " + containsDot2); } private static boolean containsDot(String input) { // Check if the string contains a dot return input.contains("."); } }

Using indexOf method:

public class DotChecker { public static void main(String[] args) { String testString1 = "example.com"; String testString2 = "noDot"; boolean containsDot1 = containsDot(testString1); boolean containsDot2 = containsDot(testString2); System.out.println("Does '" + testString1 + "' contain a dot? " + containsDot1); System.out.println("Does '" + testString2 + "' contain a dot? " + containsDot2); } private static boolean containsDot(String input) { // Check if the string contains a dot using indexOf return input.indexOf('.') != -1; } }

Both methods will return true if the string contains a dot and false otherwise. Choose the method that best fits your preference or coding style.

Examples

  1. Java string contains dot check:

    • Code: Use the contains method to check if a string contains a dot.
    boolean containsDot = myString.contains(".");

  2. Regex check for dot in Java string:

    • Code: Employ regular expressions to check if a dot is present in the string.
    boolean dotPresent = myString.matches(".*\\..*");

  3. Java string dot position check:

    • Code: Find the index of the dot in the string and check if it exists.
    int dotIndex = myString.indexOf("."); boolean dotExists = dotIndex != -1;

  4. Checking for dot in Java using endsWith:

    • Code: Use the endsWith method to check if the string ends with a dot.
    boolean endsWithDot = myString.endsWith(".");

  5. Java string dot count check:

    • Code: Count the occurrences of dots in the string and check if it's greater than zero.
    long dotCount = myString.chars().filter(ch -> ch == '.').count(); boolean containsDot = dotCount > 0;

  6. Java string dot character check:

    • Code: Iterate through characters and check if any of them is a dot.
    boolean containsDot = false; for (char c : myString.toCharArray()) { if (c == '.') { containsDot = true; break; } }

  7. Java string dot using StringUtils:

    • Code: Use Apache Commons Lang library's StringUtils to check if a string contains a dot.
    boolean dotPresent = StringUtils.contains(myString, ".");

  8. Java string dot check with regex pattern:

    • Code: Use a regex pattern to specifically check for the presence of a dot in the string.
    boolean dotExists = myString.matches(".*\\..*");

  9. Checking dot in Java ignoring case:

    • Code: Perform a case-insensitive check for the presence of a dot in the string.
    boolean containsDot = myString.toLowerCase().contains(".");

  10. Java string dot check using Java 8 streams:

    • Code: Utilize Java 8 streams to check if the string contains a dot.
    boolean containsDot = myString.chars().anyMatch(ch -> ch == '.');

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