小编Jax*_*mas的帖子

我试图在我的程序中实现这个微小的方面,但它真的让我很难在最小的东西上...

txtDay.getText().toUpperCase();
    switch(txtEmployeeID.getText()){
        case "54215":
            switch(txtDay.getText()){
                case "SUNDAY":
                    E54215.set(0, txtHours.getText());
                    break;
                case "MONDAY":
                    E54215.set(1, txtHours.getText());
                    break;
                case "TUESDAY":
                    E54215.set(2, txtHours.getText());
                    break;
                case "WEDNESDAY":
                    E54215.set(3, txtHours.getText());
                    break;
                case "THURSDAY":
                    E54215.set(4, txtHours.getText());
                    break;
                case "FRIDAY":
                    E54215.set(5, txtHours.getText());
                    break;
                case "SATURDAY":
                    E54215.set(6, txtHours.getText());
                    break;   
            }
            break;

NetBeans在"txtDay.getText().toUppercase()"行中给出了一个错误,并告诉我"应检查方法返回值".

有人可以帮我找出为什么会出现这个错误吗？