Question

I’m trying to split a string by a backslash but I’m having problems. I’m sure I have the expression right can someone read what I’ve done and tell me my problem?

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package taskstodo;

public class Task {
    StringBuilder name;
    StringBuilder note;
    StringBuilder date;

    void setName(String name) {
        this.name = new StringBuilder(name);
    }
    void setNote(String note) {
        this.note = new StringBuilder(note);
    }
    boolean dateIsValid() {
        String dateStr = date.toString();
        String[] numbers = (dateStr.split("[\\\\]"));
        for(String num : numbers) {
            System.out.println(num);
            if ((num.length()) != 2) {
                return false;
            }
            return true;
        }
        return true;
    }
    void setDate(String date) {
        this.date = new StringBuilder(date);
    }
}

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package taskstodo;

public class TasksToDo {

public static void main(String[] args) {
    Task myTask = new Task();
    myTask.setDate("02/03/20");
    System.out.println(myTask.dateIsValid());
    Task myTask2 = new Task();
    myTask2.setDate("23/45/6001");
    System.out.println(myTask2.dateIsValid());
}

}

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The TasksToDo class tests the Task class.

It should return:

02
03
20
true
23
45
6001
false

But it returns:

02/03/20
false
23/45/6001
false

Answer 1

You say you want to split by backslash \ but you’re passing in forward slash / to your test case. How can you expect it to work?!

Try this

public static void main(String[] args) {
    Task myTask = new Task();
    myTask.setDate("02\\03\\20");
    System.out.println(myTask.dateIsValid());
    Task myTask2 = new Task();
    myTask2.setDate("23\\45\\6001");
    System.out.println(myTask2.dateIsValid());
}