Using any constants within StandardCharsets does not solve the issue. If you open test.txt file using Hex Editor, you'll notice that it will convert all 4 Unicode characters into a character with a value of 0x3F. Try (FileWriter writer = new FileWriter("C:\\test.txt")) If I tried to use the constructor: String(int codePoints, int offset, int count) or Character.toString(int codePoint), then they will just convert every character beyond 16-bit into 0x3F (1-byte values). If we look at the implementation, basically they all support only 16-bit Unicode in nature. WARNING: These older versions of the JDK are provided to help developers debug issues in older systems. The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the Java TM platform. I notice that the String class can also parse byte arrays as Unicode strings only if it is recognized by the StandardCharsets class. The JDK is a development environment for building applications using the Java programming language.
Hence it can have a maximum combination of just 65,536 Unicode characters. The class supports Unicode Character Database ofġ4.0 level, which adds 838 characters, for a total of 144,697 characters In JDK 19 the release notes states the following:
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