查看class文件结构使用JavaClassViewer工具。
1、TestScope类
$ javap -verbose TestScope.class Classfile /C:/TestScope.class Last modified 2018-7-10; size 327 bytes MD5 checksum 251bc20d8ef59d8208e84d7124bbb2b7 Compiled from "TestScope.java" public class com.test18.TestScope SourceFile: "TestScope.java" minor version: 0 major version: 51 flags: ACC_PUBLIC, ACC_SUPER Constant pool: #1 = Methodref #3.#13 // java/lang/Object."":()V #2 = Class #14 // com/test18/TestScope #3 = Class #15 // java/lang/Object #4 = Utf8 #5 = Utf8 ()V #6 = Utf8 Code #7 = Utf8 LineNumberTable #8 = Utf8 test02 #9 = Utf8 StackMapTable #10 = Class #16 // java/lang/Throwable #11 = Utf8 SourceFile #12 = Utf8 TestScope.java #13 = NameAndType #4:#5 // " ":()V #14 = Utf8 com/test18/TestScope #15 = Utf8 java/lang/Object #16 = Utf8 java/lang/Throwable { public com.test18.TestScope(); flags: ACC_PUBLIC Code: stack=1, locals=1, args_size=1 0: aload_0 1: invokespecial #1 // Method java/lang/Object." ":()V 4: return LineNumberTable: line 9: 0 public void test02(); flags: ACC_PUBLIC Code: stack=1, locals=2, args_size=1 0: goto 6 3: astore_1 4: aload_1 5: athrow 6: return Exception table: from to target type 3 4 3 any LineNumberTable: line 24: 0 line 22: 3 line 25: 6 StackMapTable: number_of_entries = 2 frame_type = 67 /* same_locals_1_stack_item */ stack = [ class java/lang/Throwable ] frame_type = 2 /* same */ }
2、OuterB$1.class
$ javap -verbose OuterB\$1.class
Classfile /C:/OuterB$1.class
Last modified 2018-7-21; size 478 bytes
MD5 checksum c9b8d8119df1fd29b9744de774f9ea66
Compiled from "TestScope.java"
class com.test18.OuterB$1 extends com.test18.OuterA
SourceFile: "TestScope.java"
EnclosingMethod: #3.#0 // com.test18.OuterB
InnerClasses:
#6; //class com/test18/OuterB$1
minor version: 0
major version: 51
flags: ACC_SUPER
Constant pool:
#1 = Fieldref #6.#19 // com/test18/OuterB$1.this$0:Lcom/test18/OuterB;
#2 = Methodref #7.#20 // com/test18/OuterA."":()V
#3 = Class #21 // com/test18/OuterB
#4 = Methodref #3.#20 // com/test18/OuterB."":()V
#5 = Methodref #3.#22 // com/test18/OuterB.access$000:(Lcom/test18/OuterB;)I
#6 = Class #23 // com/test18/OuterB$1
#7 = Class #26 // com/test18/OuterA
#8 = Utf8 this$0
#9 = Utf8 Lcom/test18/OuterB;
#10 = Utf8
#11 = Utf8 (Lcom/test18/OuterB;)V
#12 = Utf8 Code
#13 = Utf8 LineNumberTable
#14 = Utf8 t
#15 = Utf8 ()V
#16 = Utf8 SourceFile
#17 = Utf8 TestScope.java
#18 = Utf8 EnclosingMethod
#19 = NameAndType #8:#9 // this$0:Lcom/test18/OuterB;
#20 = NameAndType #10:#15 // "":()V
#21 = Utf8 com/test18/OuterB
#22 = NameAndType #27:#28 // access$000:(Lcom/test18/OuterB;)I
#23 = Utf8 com/test18/OuterB$1
#24 = Utf8
#25 = Utf8 InnerClasses
#26 = Utf8 com/test18/OuterA
#27 = Utf8 access$000
#28 = Utf8 (Lcom/test18/OuterB;)I
{
final com.test18.OuterB this$0;
flags: ACC_FINAL, ACC_SYNTHETIC
com.test18.OuterB$1(com.test18.OuterB);
flags:
Code:
stack=2, locals=2, args_size=2
0: aload_0
1: aload_1
2: putfield #1 // Field this$0:Lcom/test18/OuterB;
5: aload_0
6: invokespecial #2 // Method com/test18/OuterA."":()V
9: return
LineNumberTable:
line 9: 0
public void t();
flags: ACC_PUBLIC
Code:
stack=2, locals=2, args_size=1
0: new #3 // class com/test18/OuterB
3: dup
4: invokespecial #4 // Method com/test18/OuterB."":()V
7: invokestatic #5 // Method com/test18/OuterB.access$000:(Lcom/test18/OuterB;)I
10: istore_1
11: return
LineNumberTable:
line 11: 0
line 12: 11
}
3、OuterB.class
Classfile /C:/OuterB.class
Last modified 2018-7-21; size 465 bytes
MD5 checksum 6fa96007c1c2abcaa53fdc993e969551
Compiled from "TestScope.java"
class com.test18.OuterB extends com.test19.TestProtectedClass
SourceFile: "TestScope.java"
InnerClasses:
#3; //class com/test18/OuterB$1
minor version: 0
major version: 51
flags: ACC_SUPER
Constant pool:
#1 = Fieldref #6.#20 // com/test18/OuterB.a:I
#2 = Methodref #7.#21 // com/test19/TestProtectedClass."":()V
#3 = Class #22 // com/test18/OuterB$1
#4 = Methodref #3.#23 // com/test18/OuterB$1."":(Lcom/test18/OuterB;)V
#5 = Fieldref #6.#24 // com/test18/OuterB.o:Ljava/lang/Object;
#6 = Class #25 // com/test18/OuterB
#7 = Class #26 // com/test19/TestProtectedClass
#8 = Utf8
#9 = Utf8 InnerClasses
#10 = Utf8 o
#11 = Utf8 Ljava/lang/Object;
#12 = Utf8
#13 = Utf8 ()V
#14 = Utf8 Code
#15 = Utf8 LineNumberTable
#16 = Utf8 access$000
#17 = Utf8 (Lcom/test18/OuterB;)I
#18 = Utf8 SourceFile
#19 = Utf8 TestScope.java
#20 = NameAndType #27:#28 // a:I
#21 = NameAndType #12:#13 // "":()V
#22 = Utf8 com/test18/OuterB$1
#23 = NameAndType #12:#29 // "":(Lcom/test18/OuterB;)V
#24 = NameAndType #10:#11 // o:Ljava/lang/Object;
#25 = Utf8 com/test18/OuterB
#26 = Utf8 com/test19/TestProtectedClass
#27 = Utf8 a
#28 = Utf8 I
#29 = Utf8 (Lcom/test18/OuterB;)V
{
java.lang.Object o;
flags:
com.test18.OuterB();
flags:
Code:
stack=4, locals=1, args_size=1
0: aload_0
1: invokespecial #2 // Method com/test19/TestProtectedClass."":()V
4: aload_0
5: new #3 // class com/test18/OuterB$1
8: dup
9: aload_0
10: invokespecial #4 // Method com/test18/OuterB$1."":(Lcom/test18/OuterB;)V
13: putfield #5 // Field o:Ljava/lang/Object;
16: return
LineNumberTable:
line 8: 0
line 9: 4
static int access$000(com.test18.OuterB);
flags: ACC_STATIC, ACC_SYNTHETIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: getfield #1 // Field a:I
4: ireturn
LineNumberTable:
line 8: 0
}