您引用的文档实际上是 JVM 类文件规范的逐字转录（转换为更简单的英语）。
我随身携带的一些历史价值
Major Major(hex) Minor Java platform version
45 2d 3 1.0
45 2d 3 1.1
46 2e 0 1.2
47 2f 0 1.3
48 30 0 1.4
49 31 0 1.5
50 32 0 1.6
--- 编辑以回应 Neil 的观察，即 1.0 和 1.1 使用相同的主要次要数字 ---
从类头中，无法确定该类是针对 1.0 还是 1.1 版本的 Java 编译的。也就是说，还有许多其他技术可以帮助确定一个类是针对 1.0 还是 1.1 编译的。
首先，如果该类是针对 1.1 编译的，则它可能包含仅 1.1 的库类。一旦您在其中一个类中找到其中一个，您就可以放心地断定它是针对 Java 1.1 编译的类。
请注意，人们可以在类的开头搜索常量池，以确定类文件需要哪些类来完全解析其所有外部引用。
单独搜索类可能很麻烦，幸运的是还添加了很多包。以下软件包特定于 Java 1.1，即它们未包含在 Java 1.0 中
+ java.awt.datatransfer
+ java.awt.event
+ java.beans
+ java.lang.reflect
+ java.math
+ java.rmi.dgc
+ java.rmi
+ java.rmi.registry
+ java.rmi.server
+ java.security.acl
+ java.security
+ java.security.interfaces
+ java.sql
+ java.text
+ java.util.zip
另一方面，对以下方法的大量调用表明（但不是实际证据）该代码是针对 Java 1.0 编写的，因为由于新的 awt 事件重组，它们在 Java 1.1 中已被弃用。
Deprecated Classes
java.io.LineNumberInputStream:
LineNumberInputStream is deprecated.
java.io.StringBufferInputStream:
StringBufferInputStream is deprecated.
Deprecated Methods
java.awt.BorderLayout:
addLayoutComponent() is deprecated.
java.awt.CardLayout:
addLayoutComponent() is deprecated.
java.awt.CheckboxGroup:
getCurrent() is deprecated.
java.awt.CheckboxGroup:
setCurrent() is deprecated.
java.awt.Choice:
countItems() is deprecated.
java.awt.Component:
getPeer() is deprecated.
java.awt.Component:
enable() is deprecated.
java.awt.Component:
enable() is deprecated.
java.awt.Component:
disable() is deprecated.
java.awt.Component:
show() is deprecated.
java.awt.Component:
show() is deprecated.
java.awt.Component:
hide() is deprecated.
java.awt.Component:
location() is deprecated.
java.awt.Component:
move() is deprecated.
java.awt.Component:
size() is deprecated.
java.awt.Component:
resize() is deprecated.
java.awt.Component:
resize() is deprecated.
java.awt.Component:
bounds() is deprecated.
java.awt.Component:
reshape() is deprecated.
java.awt.Component:
preferredSize() is deprecated.
java.awt.Component:
minimumSize() is deprecated.
java.awt.Component:
layout() is deprecated.
java.awt.Component:
inside() is deprecated.
java.awt.Component:
locate() is deprecated.
java.awt.Component:
deliverEvent() is deprecated.
java.awt.Component:
postEvent() is deprecated.
java.awt.Component:
handleEvent() is deprecated.
java.awt.Component:
mouseDown() is deprecated.
java.awt.Component:
mouseDrag() is deprecated.
java.awt.Component:
mouseUp() is deprecated.
java.awt.Component:
mouseMove() is deprecated.
java.awt.Component:
mouseEnter() is deprecated.
java.awt.Component:
mouseExit() is deprecated.
java.awt.Component:
keyDown() is deprecated.
java.awt.Component:
keyUp() is deprecated.
java.awt.Component:
action() is deprecated.
java.awt.Component:
gotFocus() is deprecated.
java.awt.Component:
lostFocus() is deprecated.
java.awt.Component:
nextFocus() is deprecated.
java.awt.Container:
countComponents() is deprecated.
java.awt.Container:
insets() is deprecated.
java.awt.Container:
layout() is deprecated.
java.awt.Container:
preferredSize() is deprecated.
java.awt.Container:
minimumSize() is deprecated.
java.awt.Container:
deliverEvent() is deprecated.
java.awt.Container:
locate() is deprecated.
java.awt.FontMetrics:
getMaxDecent() is deprecated.
java.awt.Frame:
setCursor() is deprecated.
java.awt.Frame:
getCursorType() is deprecated.
java.awt.Graphics:
getClipRect() is deprecated.
java.awt.List:
countItems() is deprecated.
java.awt.List:
clear() is deprecated.
java.awt.List:
isSelected() is deprecated.
java.awt.List:
allowsMultipleSelections() is deprecated.
java.awt.List:
setMultipleSelections() is deprecated.
java.awt.List:
preferredSize() is deprecated.
java.awt.List:
preferredSize() is deprecated.
java.awt.List:
minimumSize() is deprecated.
java.awt.List:
minimumSize() is deprecated.
java.awt.List:
delItems() is deprecated.
java.awt.Menu:
countItems() is deprecated.
java.awt.MenuBar:
countMenus() is deprecated.
java.awt.MenuComponent:
getPeer() is deprecated.
java.awt.MenuComponent:
postEvent() is deprecated.
java.awt.MenuContainer:
postEvent() is deprecated.
java.awt.MenuItem:
enable() is deprecated.
java.awt.MenuItem:
enable() is deprecated.
java.awt.MenuItem:
disable() is deprecated.
java.awt.Polygon:
getBoundingBox() is deprecated.
java.awt.Polygon:
inside() is deprecated.
java.awt.Rectangle:
reshape() is deprecated.
java.awt.Rectangle:
move() is deprecated.
java.awt.Rectangle:
resize() is deprecated.
java.awt.Rectangle:
inside() is deprecated.
java.awt.ScrollPane:
layout() is deprecated.
java.awt.Scrollbar:
getVisible() is deprecated.
java.awt.Scrollbar:
setLineIncrement() is deprecated.
java.awt.Scrollbar:
getLineIncrement() is deprecated.
java.awt.Scrollbar:
setPageIncrement() is deprecated.
java.awt.Scrollbar:
getPageIncrement() is deprecated.
java.awt.TextArea:
insertText() is deprecated.
java.awt.TextArea:
appendText() is deprecated.
java.awt.TextArea:
replaceText() is deprecated.
java.awt.TextArea:
preferredSize() is deprecated.
java.awt.TextArea:
preferredSize() is deprecated.
java.awt.TextArea:
minimumSize() is deprecated.
java.awt.TextArea:
minimumSize() is deprecated.
java.awt.TextField:
setEchoCharacter() is deprecated.
java.awt.TextField:
preferredSize() is deprecated.
java.awt.TextField:
preferredSize() is deprecated.
java.awt.TextField:
minimumSize() is deprecated.
java.awt.TextField:
minimumSize() is deprecated.
java.awt.Window:
postEvent() is deprecated.
java.io.ByteArrayOutputStream:
toString() is deprecated.
java.io.DataInputStream:
readLine() is deprecated.
java.io.PrintStream:
PrintStream() is deprecated.
java.io.PrintStream:
PrintStream() is deprecated.
java.io.StreamTokenizer:
StreamTokenizer() is deprecated.
java.lang.Character:
isJavaLetter() is deprecated.
java.lang.Character:
isJavaLetterOrDigit() is deprecated.
java.lang.Character:
isSpace() is deprecated.
java.lang.ClassLoader:
defineClass() is deprecated.
java.lang.Runtime:
getLocalizedInputStream() is deprecated.
java.lang.Runtime:
getLocalizedOutputStream() is deprecated.
java.lang.String:
String() is deprecated.
java.lang.String:
String() is deprecated.
java.lang.String:
getBytes() is deprecated.
java.lang.System:
getenv() is deprecated.
java.net.Socket:
Socket() is deprecated.
java.net.Socket:
Socket() is deprecated.
java.util.Date:
Date() is deprecated.
java.util.Date:
Date() is deprecated.
java.util.Date:
Date() is deprecated.
java.util.Date:
Date() is deprecated.
java.util.Date:
UTC() is deprecated.
java.util.Date:
parse() is deprecated.
java.util.Date:
getYear() is deprecated.
java.util.Date:
setYear() is deprecated.
java.util.Date:
getMonth() is deprecated.
java.util.Date:
setMonth() is deprecated.
java.util.Date:
getDate() is deprecated.
java.util.Date:
setDate() is deprecated.
java.util.Date:
getDay() is deprecated.
java.util.Date:
getHours() is deprecated.
java.util.Date:
setHours() is deprecated.
java.util.Date:
getMinutes() is deprecated.
java.util.Date:
setMinutes() is deprecated.
java.util.Date:
getSeconds() is deprecated.
java.util.Date:
setSeconds() is deprecated.
java.util.Date:
toLocaleString() is deprecated.
java.util.Date:
toGMTString() is deprecated.
java.util.Date:
getTimezoneOffset() is deprecated.
可以证明 Java 代码是 1.1 版本，但仅限于某些情况（如果代码使用新添加的 1.1 功能）。通常不可能证明 Java 代码是 1.0，但缺乏任何 Java 1.1 功能的使用，以及大量使用 Java 已弃用的功能，暗示了针对 Java 1.0 环境的类。
我不知道任何类内标记可能能够区分这两者（行号表中的差异等），主要是因为我不需要在十六进制编辑器中挖掘 1.0 和 1.1 类。
