When you run the attached class with an input encoding name of Cp930, Cp933, Cp935, Cp937, Cp939, you will get the following exception
Exception in thread "main" java.lang.InternalError: this.getMaxBytesPerChar returned bad value
        at sun.io.CharToByteConverter.convertAll(CharToByteConverter.java:221)
        at TestEncoding.test(TestEncoding.java:42)
        at TestEncoding.main(TestEncoding.java:25)

The attached java file has only normal operation to convert a character one by one.