小编Nit*_*waj的帖子

我已经阅读了以下帖子:

1. 什么是Java的String内部代表？修改过的UTF-8？UTF-16？
2. https://docs.oracle.com/javase/8/docs/api/java/lang/String.html

现在考虑下面给出的代码:

public static void main(String[] args) {
    printCharacterDetails("?");
}

public static void printCharacterDetails(String character){
    System.out.println("Unicode Value for "+character+"="+Integer.toHexString(character.codePointAt(0)));
    byte[] bytes = character.getBytes();
    System.out.println("The UTF-8 Character="+character+"  | Default: Number of Bytes="+bytes.length);
    String stringUTF16 = new String(bytes, StandardCharsets.UTF_16);
    System.out.println("The corresponding UTF-16 Character="+stringUTF16+"  | UTF-16: Number of Bytes="+stringUTF16.getBytes().length);
    System.out.println("----------------------------------------------------------------------------------------");
}

当我尝试character.getBytes()在上面的代码中调试行时,调试器将我带入getBytes()String类的方法,然后进入static byte[] encode(char[] ca, int off, int len)StringCoding类的方法.String csn = Charset.defaultCharset().name();在调试过程中,encode method()的第一行返回"UTF-8"作为默认编码.我预计它会是"UTF-16".

该计划的输出是:

最大的Unicode值= 6700 UTF-8字符=最| 默认值:字节数= 3

相应的UTF-16字符= | UTF-16:字节数= 6 …