The java.text.MessageFormat code format lets you use strings that are constructed dynamically at runtime. The dynamically added elements are stored in an array of objects, which is passed as a parameter to java.text.MessageFormat. You can use the Message Format Arguments dialog box to specify the values of these objects.
To enter substitution parameters for a message format:
A series of parameters, beginning with 0, is added to the text field.
The arguments you supply are substutued for {arguments} wildcard of the format:
java.text.MessageFormat(java.util.ResourceBundle.getBundle("bundle name").getString("key"),
new Object[] {arg1, arg2, arg3})
See the documentation for java.text.MessageFormat for more information on using localized strings with parameters.