Question

我有3个按钮，更新，删除和显示历史记录。我试图确保在可以实现任何3个按钮之前表格有一个选定的行。我这里的例子是删除按钮。我已经包含了Delete JButton的监听器和Table的Selection Listener。我不确定如何让按钮首先听表Selection Listener。

删除操作按钮侦听器

deleteButton.addActionListener(new ActionListener() {


        public void actionPerformed(ActionEvent e) {    

            isContactSelected();

            // Display yes/no dialog box over mainpanel when okButton is clicked
            int answer = JOptionPane.showConfirmDialog(mainPanel, "Are you sure you wish to delete contact?", "Decision", JOptionPane.YES_NO_OPTION);
            // if yes is chosen system closed with an information box
            if (answer == JOptionPane.YES_OPTION) {

                JOptionPane.showMessageDialog (mainPanel, "Contact has been deleted", "Information", JOptionPane.INFORMATION_MESSAGE);

                // if no is chosen system stays running
            } else if (answer == JOptionPane.NO_OPTION) {   


                // dont do anything


            }}
    });

检查是否已选择行

public void isContactSelected(){

    ListSelectionModel selected  = table.getSelectionModel();
    //
    selected.addListSelectionListener(new ListSelectionListener(){

        public void valueChanged(ListSelectionEvent e){

            int row = table.getSelectedRowCount();

            // if the number of rows selected is equal to 0
            if(row  > 0)

            {


            }else{

                System.out.println("Please select a contact");


            }

        }


    });
}

Answer 1

你可以让你的按钮保持活动状态＆amp;一旦按下检查是否有任何选择＆amp;如果没有选择显示类似joptionpane

的东西

int row, column;

row = table.getSelectedRow();
table.getModel().getValueAt(row, column); //from here you can delete the row/column

检查是否使用JButton选择了一行

1 个答案: