访问动态生成的GUI JTextField对象 [英] Accessing GUI JTextField objects that are dynamically generated

问题描述

我正在编写一个包含JButton的程序.每次单击按钮时，都会将新的JTextField添加到JPanel.

I am writing a program that contains a JButton. Every time the button is clicked, a new JTextField is added to a JPanel.

我的问题是，在用户创建了所有JTextFields并将其填充信息之后，我需要获取每个字段的文本.动态生成JTextFields时，由于它们没有实例名称，如何获得它们的访问权限?是否有一种更好的方法来获取每个文本，而又不知道它们的实例名称.

My problem is that, after the user has created all the JTextFields and filled them with information, I need to get the text of each field. How can I get access to the JTextFields when they are dynamically generated, as they don't have instance names? Is there a better way to get the text of each one, without knowing their instance name.

这是JButton ...

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    JTextField x = new JTextField();
    x.setColumns(12);
    p.add(x); 
    validate();
}

推荐答案

您说您想从每个字段中获取文本.因此，当您创建新实例x时，为什么不保留它们的集合，例如将JTextFields添加到ArrayList?

You say you want to get the text from each field. So, when you create the new instances x, why don't you keep a collection of them, such as adding the JTextFields to an ArrayList?

或者，假设p是JPanel，您应该能够获取所有子级，这就是您要添加的JTextFields.尝试像这样使用getComponents() ...

Alternatively, assuming that p is a JPanel, you should be able to get all the children, which would be the JTextFields that you're adding. Try using getComponents() like so...

Component[] children = p.getComponents();
for (int i=0;i<children.length;i++){
    if (children[i] instanceof JTextField){
        String text = ((JTextField)children[i]).getText():
    }
}

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