Java case 语句未初始化变量

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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已关闭 5 年前。

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如果我从 JOptionPane 中注释掉月份，我就可以让我的代码正常工作。似乎 switch case 没有公开设置变量(如果这是有道理的)。这是我的代码。

    String[] sDateIn = jTextField1.getText().split("/");
    int mDate = Integer.parseInt(sDateIn[0]);
    int dDate = Integer.parseInt(sDateIn[1]);
    int yDate = Integer.parseInt(sDateIn[2]);
    String month;
    switch (mDate) {
        case 1:
            month = "Jan";
            break;
        case 2:
            month = "Feb";
            break;
        case 3:
            month = "Mar";
            break;
        case 4:
            month = "Apr";
            break;
        case 5:
            month = "May";
            break;
        case 6:
            month = "Jun";
            break;
        case 7:
            month = "Jul";
            break;
        case 8:
            month = "Aug";
            break;
        case 9:
            month = "Sep";
            break;
        case 10:
            month = "Oct";
            break;
        case 11:
            month = "Nov";
            break;
        default:
            month = "Dec";
            break;
    }        
    //display output
    JOptionPane.showMessageDialog(this, "The converted date is " + Month + " " + dDate + ", " + yDate);

Answer 1

似乎您要附加月份而不是月份。

JOptionPane.showMessageDialog(this, "The converted date is " + month /*Month to month*/ + " " + dDate + ", " + yDate);