[JAVA] I want to find out if the specified character string is supported by the target character code

If you want to find out if the specified string is supported by the target character code, it is convenient to use CharsetEncoder.canEncode. This is a method that returns true if the method given as an argument is supported by the target character code, false otherwise, for example, if you want to check whether the string s is supported in Shift_JIS, the following You can write as follows.

String s = "...";

As an example of verifying that it is actually working, we will use the kanji "Taka". It's a so-called "ladder". This Kanji is not supported in Shift_JIS, but it is supported in its extension Windows-31J. Let's check this.

Charset.forName("Shift_JIS").newEncoder().canEncode("Taka");   //=> false
Charset.forName("Windows-31J").newEncoder().canEncode("Taka"); //=> true

It seems to be working as expected (´ ・ ω ・ `)

** Environmental Information: **

C:\>javac -version
javac 11.0.3
C:\>java -version
openjdk version "11.0.3" 2019-04-16
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.3+7)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.3+7, mixed mode)

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