单击提交按钮，然后在标签上显示客户详细信息时，如何获取帐户ID？

Question

    // submit button
    JButton btnSubmit = new JButton("Submit");

    btnSubmit.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e) {

    JButton btnSubmit = new JButton("Submit");
        //label that used to display the name, house number, postcode
    JLabel lblNameDisplay = new JLabel("-");

    JLabel lblHouseNoDisplay = new JLabel("-");

    JLabel lblPostCodeDisplay = new JLabel("-");

    Object accID = e.getSource();
    //when clicking the submit, should get account id and display the client details on the label
    if(accID==btnSubmit){


        }   
    }

Answer 1

In your code you have two btnSubmit variables

JButton btnSubmit = new JButton("Submit");     <-----

btnSubmit.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

JButton btnSubmit = new JButton("Submit");    <-----

If you do if(accID==btnSubmit) - Which one are you using?

But anyway,

The actionListener is bound to your btnSubmit button so getSource() is going to return the btnSubmit object.

Answer 2

Any code within

public void actionPerformed(ActionEvent e) { ... }

will be executed when clicking the "Submit" button because you created an anonymous action listener specifically for use with the button (hence use of anonymous inner class).

Therefore, all you really need to put in the actionPerformed(...) method would be the assignment of the new labels (assuming that they already exist or you got them somewhere).

eg

btnSubmit.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        lblExampleLabel.setText("This is what the label will become after clicking the button");
    }
});