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15.12.1.Custom Document FilterCustom Document Filter
15.12.2.extends PlainDocument to create a float value type text field
15.12.3.extends PlainDocument to create alpha and numeric value based field field
15.12.4.Element WalkerElement Walker
15.12.5.Implement a document cleaner that maps lowercase letters to uppercase
15.12.6.Limit JTextField input to a maximum length