public void setDefaultValue(Object defaultValue) {
		this.defaultValue = defaultValue;
		this.defaultText = getText(); // get the formatted text
		update();
	}
Establish default value.  Text field value should be set before invoking this method.
@param defaultValue default value
Ghidra/Framework/Docking/src/main/java/docking/widgets/textfield/GFormattedTextField.java