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I'm implementing a timetable for a scholar use. I'd like to have a String [] object that has ALL the subjects erogated in a week. I thinked to append every String [] dailySubjects (that I have) to aString [] object (that we can call weekSubjects). In logical plan it's simple to see. But I've tried to implement and I'm having no results. How can I do? there is not an add method for String[]. That method would make all easier. By the way, My code 

public Class getWeekSubjects () {
    public getWeekSubjects () {
        //this is a String [] composed by all the subject in a day
        String dailySubjects [] = new timetable().getDailySubjects;
    }
}
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4 回答 4

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我认为ArrayList最适合您的情况。此外，您应该在追加时使用StringBuilder 。

于 2013-09-16T16:11:28.860 回答
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数组有固定的长度。您可以 (a) 使用ArrayList没有固定长度的 ，或 (b) 创建一个足够大的新数组以容纳所有数据并用于System.arraycopy()复制您的值。

于 2013-09-16T16:11:44.823 回答
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如果我理解正确，您有一种获取每日科目的方法，现在您想将所有周科目放在一个数组中。

但是如果每天的科目重复呢？（周一数学，周二数学。）在这种情况下，你会想要一个集合，而不是一个数组。

public String[] getWeekSubjects() {
    Set<String> weekSubjects = new HashSet<String>();
    String[] dailySubjects = new timetable().getDailySubjects();
    Collections.addAll(weekSubjects, dailySubjects);

    // Add the other daily subjects... (somehow)    
    return weekSubjects.toArray(new String[0]);
}

顺便说一句，你发布的代码太可怕了......如果你的实际代码是这样的，那么你有更大的问题需要处理。

于 2013-09-16T16:12:54.723 回答
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为什么不使用 aList<String>或其他东西，您必须使用硬性要求吗String[]？

于 2013-09-16T16:11:51.513 回答