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Is it to possible to capitalize the letters in a Textfield as they are being typed by the user in Java?
E.g. The user would type 'hello' and 'HELLO' would appear in the Textfield.
(Odd request and I don't like the idea either).
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String string = "Contains some Upper and some Lower."; String string2 = string. toUpperCase(); String string3 = string. toLowerCase(); These two methods transform a string into all uppercase or all lowercase letters.
The String type is capitalized because it is a class, like Object , not a primitive type like boolean or int (the other types you probably ran across). As a class, the String follows the Naming Convention for Java proposed by Sun.
TextField used the text of the field as the command string for the ActionEvent . JTextField will use the command string set with the setActionCommand method if not null , otherwise it will use the text of the field as a compatibility with java. awt.
Format JTextField's text to uppercase
Uses DocumentFilter
or
How to Use Formatted Text Fields
Uses MaskFormatter
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