int ans=JOptionPane.showConfirmDialog(null,"xxxx","系統訊息",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE);if (ans==JOptionPane.YES_OPTION){ }else if (ans==JOptionPane.NO_OPTION){ }JOptionPane.showMessageDialog(null,"必填欄位不可空白。","訊息",JOptionPane.ERROR_MESSAGE);
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