将JTextField传递给另一个类

Question

I am very new to Java and I am trying to pass a JTextField to another class. Here is my code:

Method to send the JTextField from SellWindow class:

public JTextField sendTextField(){
    return addItemField;
}

Method to get the JTextField in EnterAction class:

public JTextField getItemField(){
    SellWindow field=new SellWindow();
    addItem=field.sendTextField();
    return addItem;
}

Executing the data in EnterAction class:

public void enterData(){
    System.out.println(this.getItemField().getText()); //output blank 
    System.out.println(this.addItem); //output "null"        
} 

I don't know where is the actual problem. After executing the code, it gives the following output as stated in the code's comments. It will be very helpful if someone could fix this problem. I am very new to Java and it's my first programe.

Answer 1

It's not entirely clear what you're trying to do, but from what I can tell, you have a SellWindow frame and an EnterAction frame, and you want to pass user input between the two. One issue I see is that in the getItemField method, you are creating a new SellWindow instance but not displaying it or allowing the user to interact with it at all. Instead, I would make SellWindow as a JDialog and once the user closes the dialog, get the input. Try this:

public JTextField getItemField(){
    SellWindow field=new SellWindow(null, true);
    field.setVisible(true);
    addItem=field.sendTextField();
    return addItem;
}