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set TextField value from another class

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I have a big problem. I have an application with many buttons and windows. On one of this windows (which extends Dialog class) a have a textField. I want to set it's value from another class B. If in class B I write tf.setText("test") and on the next line I write System.out.println(tf.getText) "test" is displayed, but in the textField the value doesn't change.

The idee of my program is to read some values from a file and display them in textFields in other window (extends dialog).

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Please Use One Thread Per Question. Let's continue in your other post.
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