Question

你好，伙计们这是我的第一个问题如果没有选择行我想抓住它并显示一条消息..

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Answer 1

您必须添加if条件并从try块中抛出异常。请参阅http://beginnersbook.com/2013/04/throw-in-java/以获取进一步的参考资料

Answer 2

这里是更新我的代码也有一个异常在try之外我在try中移动了行声明并且问题解决了谢谢你。

private void table_Order_EKeyPressed(java.awt.event.KeyEvent evt) {                                         

try{
     int row = table_Order_E.getSelectedRow();//the exception may be here.

        if (row >=0 && evt.getKeyCode() == KeyEvent.VK_INSERT) {
             model.addRow(rowData);//add with insert key
        }else if(row<0 && evt.getKeyCode() == KeyEvent.VK_INSERT ){
            System.err.println("No Row insert..!");
        }

        if (evt.getKeyCode() == KeyEvent.VK_DELETE && row < 0) {

        } else if (evt.getKeyCode() == KeyEvent.VK_DELETE && row > -1) {
            model.removeRow(row);//remov with delete key.

        }

}catch(ArrayIndexOutOfBoundsException e){
    if (evt.getKeyCode() == KeyEvent.VK_DELETE){
   JOptionPane.showMessageDialog(null, "Please Choose a Row To Delete..");
    }
    else if(evt.getKeyCode() == KeyEvent.VK_INSERT ){
  JOptionPane.showMessageDialog(null, "Please Click Inside The Table To Add new Row..");
    }
    }
    }

在抛出一个键后没有选中的行（-1）时捕获ArrayIndexOutOfBoundsException

2 个答案: