用Java编程语言编码

请参阅JLS7.第3.2节第16页说明

Java编程语言使用UTF-16编码表示16位代码单元序列中的文本.

我拆开了一个hello world程序.

class Y {
String hello = "hello";
}

以下是集会:

Classfile /c:/Work/SR1/e2/tmp/Y.class
Last modified Jan 5, 2014; size 240 bytes
MD5 checksum 96694fda4f346a62d5412c56dc36c45d
Compiled from "X.java"
class Y
  SourceFile: "X.java"
  minor version: 0
  major version: 52
  flags: ACC_SUPER
  Constant pool:
  #1 = Class              #2             //  Y
  #2 = Utf8               Y
  #3 = Class              #4             //  java/lang/Object
  #4 = Utf8               java/lang/Object
  #5 = Utf8               hello
  #6 = Utf8               Ljava/lang/String;
  #7 = Utf8               
  #8 = Utf8               ()V
  #9 = Utf8               Code
  #10 = Methodref          #3.#11         //  java/lang/Object."":()V
  #11 = NameAndType        #7:#8          //  "":()V
  #12 = String             #5             //  hello
  #13 = Fieldref           #1.#14         //  Y.hello:Ljava/lang/String;
  #14 = NameAndType        #5:#6          //  hello:Ljava/lang/String;
  #15 = Utf8               LineNumberTable
  #16 = Utf8               SourceFile
  #17 = Utf8               X.java
  {
  ...

我只看到Utf8编码,没有Utf16.为什么没有Utf16编码.

谢谢