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private JLabel info_sumJL;//总数信息
........
........
........
public TabbedPane() {
........
JLabel info_sumJL=new JLabel(getInfo_sum(sum_zhong,sum_jian,sum_price));
topicLabel.add(info_sumJL);
// 为表格数据添加事件监听器
tableModel.addTableModelListener(new TableModelListener() {
public void tableChanged(TableModelEvent e) {
int type = e.getType();// 获得事件的类型
int row = e.getFirstRow();// 获得触发此次事件的表格行索引
int column = e.getColumn();// 获得触发此次事件的表格列索引
//更改金额小计和neworder_id值时不触发事件,金额小计栏的索引值:6,这行代码很重要,不加狂报错
if((column==6)||(column==7)||(column==9)) return;
if (type == TableModelEvent.UPDATE) {
TableModel model = (TableModel)e.getSource();//自动获取表格模型
Object data = model.getValueAt(row, column);
int num=Integer.parseInt(data.toString());//订购数量
data=model.getValueAt(row,9);//9:订购数量_old
int num_old=Integer.parseInt(data.toString());
if(num<0){
//订购数量不能小于0
model.setValueAt(num_old+"",row,column);
}else{
Object goods_id=model.getValueAt(row,0);//商品ID
data=model.getValueAt(row,2);//商品单价
float shop_price = Float.parseFloat(data.toString());
//修改金额小计一栏的数值
model.setValueAt((shop_price*num),row,(column+1));
if(num_old!=num){
//存储数据
int id=Dao.updateNeworder(num+"",user_id,goods_id.toString());
//修改neworder_id值(有可能是新插入的记录)
model.setValueAt(id+"",row,(column+2));
//修改neworder_id值
model.setValueAt(num+"",row,(column+4));
if(num==0){
sum_zhong--;
}else if(num_old==0){
sum_zhong++;
}
int num_new=num-num_old;
sum_jian+=num_new;
sum_price+=num_new*shop_price;
String s=getInfo_sum(sum_zhong,sum_jian,sum_price);
//System.out.println(s);//这句加上正常输出
info_sumJL.setText(s);//这句加上就报错
}
}
}
}
});
........
}
........
public String getInfo_sum(int sum_zhong,int sum_jian,float sum_price){
DecimalFormat df = new DecimalFormat(".00");
return "共 "+sum_zhong+" 种 "+sum_jian+" 件 金额总计:"+df.format(sum_price)+" 元";
}