RFR: 6462028: MaskFormatter API documentation refers to getDisplayValue

[Alexey Ivanov]

On Thu, 25 Nov 2021 09:54:47 GMT, Tejesh R <duke at openjdk.java.net> wrote:

> MaskFormatter API doesn't have getDisplayValue method, hence removed from Documentation.

Please also update the copyright year at the start of the file.

src/java.desktop/share/classes/javax/swing/text/MaskFormatter.java line 103:

> 101:  *   MaskFormatter formatter = new MaskFormatter("###-####");
> 102:  *   formatter.setPlaceholderCharacter('_');
> 103:  *   formatter.getDisplayValue(tf, "123");

This code is part of an example, without this line, the following lines of documentation do not make sense. Probably, `getDisplayValue` should be replaced with `valueToString`. You should check that and ensure the sample and the expected output, as discussed in the following sentences, is correct.

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Changes requested by aivanov (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6556