Java - 用反斜杠(\)拆分字符串

Question

我试图用反斜杠分割字符串,但我遇到了问题.我敢肯定我的表达能否有人可以阅读我所做的并告诉我我的问题？

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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);
    }
}

---

package taskstodo;

公共类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());
}

}

---

TasksToDo类测试Task类.

它应该返回:

02
03
20
true
23
45
6001
false

但它返回:

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

Answer 1

你说你想用反斜杠拆分,\但你正在/向你的测试用例传递正斜杠.你怎么能期望它起作用？!

试试这个

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());
}