Create a class `DistinctSubstringLength` that provides a method to find the length of the longest substring without repeating characters in a given string.
### Expected Class
```java
public class DistinctSubstringLength {
public int maxLength(String s) {
// Implementation to find the length of the longest substring without repeating characters
}
}
```
### Usage
Here is a possible `ExerciseRunner.java` to test your class:
```java
public class ExerciseRunner {
public static void main(String[] args) {
DistinctSubstringLength finder = new DistinctSubstringLength();