【转载】CMD中查看CLASS资料编译的JDK版本
http://blog.csdn.net/qin123qq/article/details/6714264 javap -verbose classname 会输出一些信息，大致如下: Compiled from "HtmlCrawer.java" public class org.eagleeye.html.HtmlCrawer extends java.lang.Object SourceFile: "HtmlCrawer.java" minor version: 0 major version: 50 Constant pool: const #1 = class #2; // org/eagleeye/html/HtmlCrawer const #2 = Asciz org/eagleeye/html/HtmlCrawer; const #3 = class #4; // java/lang/Object const #4 = Asciz java/lang/Object; const #5 = Asciz client;.... 后面省略了，可以看到前面有两行: minor version: 0major version: 50
JDK 编译器版本
target 参数
十六进制 minor.major
十进制 minor.major
jdk1.1.8
不能带 target 参数
00 03 00 2D
45.3
jdk1.2.2
不带(默认为 -target 1.1)
00 03 00 2D
45.3
jdk1.2.2
-target 1.2
00 00 00 2E
46.0
jdk1.3.1_19
不带(默认为 -target 1.1)
00 03 00 2D
45.3
jdk1.3.1_19
-target 1.3
00 00 00 2F
47.0
j2sdk1.4.2_10
不带(默认为 -target 1.2)
00 00 00 2E
46.0
j2sdk1.4.2_10
-target 1.4
00 00 00 30
48.0
jdk1.5.0_11
不带(默认为 -target 1.5)
00 00 00 31
49.0
jdk1.5.0_11
-target 1.4 -source 1.4
00 00 00 30
48.0
jdk1.6.0_01
不带(默认为 -target 1.6)
00 00 00 32
50.0
jdk1.6.0_01
-target 1.5
00 00 00 31
49.0
jdk1.6.0_01
-target 1.4 -source 1.4
00 00 00 30
48.0
jdk1.7.0
不带(默认为 -target 1.6)
00 00 00 32
50.0
jdk1.7.0
-target 1.7
00 00 00 33
51.0
jdk1.7.0
-target 1.4 -source 1.4
00 00 00 30
48.0
Apache Harmony 5.0M3
不带(默认为 -target 1.2)
00 00 00 2E
46.0
Apache Harmony 5.0M3
-target 1.4
00 00 00 30
48.0