$ javap -v com.fenqile.outbiz.live800.Main
Classfile */classes/com/fenqile/outbiz/live800/Main.class
Last modified Aug 11, 2016; size 465 bytes
MD5 checksum 5571749f566b0de9228a8b1154d52824
Compiled from "Main.java"
public class com.fenqile.outbiz.live800.Main
SourceFile: "Main.java"
minor version: 0
major version: 51
flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
#1 = Methodref #4.#18 // java/lang/Object."<init>":()V
#2 = Methodref #19.#20 // com/alibaba/dubbo/container/Main.main:([Ljava/lang/String;)V
#3 = Class #21 // com/fenqile/outbiz/live800/Main
#4 = Class #22 // java/lang/Object
#5 = Utf8 <init>
#6 = Utf8 ()V
#7 = Utf8 Code
#8 = Utf8 LineNumberTable
#9 = Utf8 LocalVariableTable
#10 = Utf8 this
#11 = Utf8 Lcom/fenqile/outbiz/live800/Main;
#12 = Utf8 main
#13 = Utf8 ([Ljava/lang/String;)V
#14 = Utf8 args
#15 = Utf8 [Ljava/lang/String;
#16 = Utf8 SourceFile
#17 = Utf8 Main.java
#18 = NameAndType #5:#6 // "<init>":()V
#19 = Class #23 // com/alibaba/dubbo/container/Main
#20 = NameAndType #12:#13 // main:([Ljava/lang/String;)V
#21 = Utf8 com/fenqile/outbiz/live800/Main
#22 = Utf8 java/lang/Object
#23 = Utf8 com/alibaba/dubbo/container/Main
{
public com.fenqile.outbiz.live800.Main();
flags: ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokespecial #1 // Method java/lang/Object."<init>":()V
4: return
LineNumberTable:
line 11: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/fenqile/outbiz/live800/Main;
public static void main(java.lang.String[]);
flags: ACC_PUBLIC, ACC_STATIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokestatic #2 // Method com/alibaba/dubbo/container/Main.main:([Ljava/lang/String;)V
4: return
LineNumberTable:
line 14: 0
line 15: 4
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 args [Ljava/lang/String;
}
编译版本
You're looking for this on the command line (for a class called MyClass):
On Unix/Linux:
javap -verbose MyClass | grep "major"
On Windows:
javap -verbose MyClass | findstr "major"
You want the major version from the results. Here are some example values:
- Java 5 uses major version 49
- Java 6 uses major version 50
- Java 7 uses major version 51
- Java 8 uses major version 52