【转载】CMD中查看CLASS文件编译的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.majorjdk1.1.8不能带 target 参数00 03 00 2D45.3jdk1.2.2不带(默认为 -target 1.1)00 03 00 2D45.3jdk1.2.2-target 1.200 00?? 00 2E46.0jdk1.3.1_19不带(默认为 -target 1.1)00 03 00 2D45.3jdk1.3.1_19-target 1.300 00?? 00 2F47.0j2sdk1.4.2_10不带(默认为 -target 1.2)00 00?? 00 2E46.0j2sdk1.4.2_10-target 1.400 00?? 00 3048.0jdk1.5.0_11不带(默认为 -target 1.5)00 00?? 00 3149.0jdk1.5.0_11-target 1.4 -source 1.400 00?? 00 3048.0jdk1.6.0_01不带(默认为 -target 1.6)00 00?? 00 3250.0jdk1.6.0_01-target 1.500 00?? 00 3149.0jdk1.6.0_01-target 1.4 -source 1.400 00?? 00 3048.0jdk1.7.0不带(默认为 -target 1.6)00 00?? 00 3250.0jdk1.7.0-target 1.700 00?? 00 3351.0jdk1.7.0-target 1.4 -source 1.400 00?? 00 3048.0Apache Harmony 5.0M3不带(默认为 -target 1.2)00 00?? 00 2E46.0Apache Harmony 5.0M3-target 1.400 00?? 00 3048.0