if(s==null){
JOptionPane.showMessageDialog(null,"取消本趟输入","系统",JOptionPane.INFORMATION_MESSAGE);
markList = "";
i = 0;
continue;
} else if(s.equals("")){
JOptionPane.showMessageDialog(null,"请输入该学生的分数！","注意",JOptionPane.WARNING_MESSAGE);
continue;
}
else{
markList += (s+",");
i++;
}
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