java - 将变量范围从一帧扩展到另一帧

Question

我有两个基于 JFrame 的窗口:SeatLayout 和 BillSummary。我需要从 SeatLayout 框架获取 seatnumber 并将其显示在 BillSummary 中，但变量范围仅限于第一帧。

我该怎么做？

Answer 1

使用多个 JFrame 是一种不好的做法，应该避免。原因是，它会在未来增加更多问题，维护起来将是一场噩梦。

回答您的问题，如何将变量从父级(JFrame)传递到子级(JDialog)。这可以通过使用 JDialog 来实现。

我将举例说明。可以说，您的 BillSummary.java 是 ....

//BillSummary Class
public class billSummary {
   JFrame frame;
   billSummary(JFrame frame) {
    this.frame = frame;
}

  public void launchbillSummary(int seatNumber) {
    // Create a dialog that suits your ui , you can use JPanel as your layout container
    JDialog dialog = new JDialog(frame, "Bill Summary", true);
    dialog.setLayout(new BorderLayout());
    dialog.setSize(100, 100);
    dialog.add(new JLabel(Integer.toString(seatNumber)), BorderLayout.CENTER);
    dialog.setVisible(true);
  }

}

你的seatLayout.java

public class seatLayout {

 seatLayout(){  
    //Lets say you have seleted seat number 10
    int defaultSeatNumber = 10;

    //Lets say you have a button and when it is clicked , you pass the data to billsummary page
    JButton enter = new JButton("Enter");

    //Your seatLayout GUI
    JFrame frame = new JFrame("seat layout");
    frame.setSize(300,300);
    frame.add(enter);

    enter.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent arg0) {
            //Do your passing of data/ price of calculation here
            //You pass the data that to your custom dialog -> Bill summary 
            new billSummary(frame).launchbillSummary(defaultSeatNumber);
        }
    });
    frame.setVisible(true);
}


public static void main(String[] args){
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            new seatLayout();
        }
    });
  }
}

我希望这对您有所帮助并回答您的问题。祝你好运:)