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At https://github.com/forax/java-guide/blob/master/guide/chapter01-basic_types.md?plain=1#L111, I dare not call toUpperCase() or toLowerCase() without the Locale.ROOT argument.

Thanks for making this neat guide!

Just a heads up, I get a 404 visiting https://github.com/forax/java-guide/blob/master/guide/chapter19-implementing_interface.md

The stream chapter dos not have any info, why i should use them. Maybe it is helpfull to compare streams to database-sql

here are some examples:

SQL: SELECT ... FROM persons WHERE name like 'E%'
java-Streams: persons.stream().filter(person -> person.firstname.startsWith("E")

map: convert list elements of Person into a list of Employee

SQL: SELECT firstname || ' ' || lastname as name, today() - birthday as age FROM persons WHERE ....
java-Streams: persons.stream().map(person -> new Employee(person.getFirstname + " " + person.getLastname, getDifferenceInYears(new Date(), person.getBirthday()))

public class Employee {
public Employee(String name, int age)