Mac终端输入javap报错

":()V
   #2 = Class              #49            // java/util/Stack
   #3 = Methodref          #2.#48         // java/util/Stack."":()V
   #4 = Fieldref           #19.#50        // niukeWeb/evalRPN.stack:Ljava/util/Stack;
   #5 = Fieldref           #19.#51        // niukeWeb/evalRPN.length:I
   #6 = Methodref          #10.#52        // java/lang/Integer.parseInt:(Ljava/lang/String;)I
   #7 = String             #53            // +
   #8 = Methodref          #21.#54        // java/lang/String.equals:(Ljava/lang/Object;)Z
   #9 = Methodref          #2.#55         // java/util/Stack.pop:()Ljava/lang/Object;
  #10 = Class              #56            // java/lang/Integer
  #11 = Methodref          #10.#57        // java/lang/Integer.intValue:()I
  #12 = Fieldref           #19.#58        // niukeWeb/evalRPN.result:I
  #13 = Methodref          #10.#59        // java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
  #14 = Methodref          #2.#60         // java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;
  #15 = String             #61            // -
  #16 = String             #62            // *
  #17 = String             #63            // /
  #18 = Methodref          #21.#64        // java/lang/String.trim:()Ljava/lang/String;
  #19 = Class              #65            // niukeWeb/evalRPN
  #20 = Methodref          #19.#48        // niukeWeb/evalRPN."":()V
  #21 = Class              #66            // java/lang/String
  #22 = String             #67            // 2
  #23 = String             #68            // 1
  #24 = String             #69            // 3
  #25 = Methodref          #19.#70        // niukeWeb/evalRPN.evalRPN:([Ljava/lang/String;)I
  #26 = Fieldref           #71.#72        // java/lang/System.out:Ljava/io/PrintStream;
  #27 = Methodref          #73.#74        // java/io/PrintStream.println:(I)V
  #28 = String             #75            // 0
  #29 = Class              #76            // java/lang/Object
  #30 = Utf8               stack
  #31 = Utf8               Ljava/util/Stack;
  #32 = Utf8               Signature
  #33 = Utf8               Ljava/util/Stack;
  #34 = Utf8               length
  #35 = Utf8               I
  #36 = Utf8               result
  #37 = Utf8               
  #38 = Utf8               ()V
  #39 = Utf8               Code
  #40 = Utf8               LineNumberTable
  #41 = Utf8               evalRPN
  #42 = Utf8               ([Ljava/lang/String;)I
  #43 = Utf8               StackMapTable
  #44 = Utf8               main
  #45 = Utf8               ([Ljava/lang/String;)V
  #46 = Utf8               SourceFile
  #47 = Utf8               evalRPN.java
  #48 = NameAndType        #37:#38        // "":()V
  #49 = Utf8               java/util/Stack
  #50 = NameAndType        #30:#31        // stack:Ljava/util/Stack;
  #51 = NameAndType        #34:#35        // length:I
  #52 = NameAndType        #77:#78        // parseInt:(Ljava/lang/String;)I
  #53 = Utf8               +
  #54 = NameAndType        #79:#80        // equals:(Ljava/lang/Object;)Z
  #55 = NameAndType        #81:#82        // pop:()Ljava/lang/Object;
  #56 = Utf8               java/lang/Integer
  #57 = NameAndType        #83:#84        // intValue:()I
  #58 = NameAndType        #36:#35        // result:I
  #59 = NameAndType        #85:#86        // valueOf:(I)Ljava/lang/Integer;
  #60 = NameAndType        #87:#88        // push:(Ljava/lang/Object;)Ljava/lang/Object;
  #61 = Utf8               -
  #62 = Utf8               *
  #63 = Utf8               /
  #64 = NameAndType        #89:#90        // trim:()Ljava/lang/String;
  #65 = Utf8               niukeWeb/evalRPN
  #66 = Utf8               java/lang/String
  #67 = Utf8               2
  #68 = Utf8               1
  #69 = Utf8               3
  #70 = NameAndType        #41:#42        // evalRPN:([Ljava/lang/String;)I
  #71 = Class              #91            // java/lang/System
  #72 = NameAndType        #92:#93        // out:Ljava/io/PrintStream;
  #73 = Class              #94            // java/io/PrintStream
  #74 = NameAndType        #95:#96        // println:(I)V
  #75 = Utf8               0
  #76 = Utf8               java/lang/Object
  #77 = Utf8               parseInt
  #78 = Utf8               (Ljava/lang/String;)I
  #79 = Utf8               equals
  #80 = Utf8               (Ljava/lang/Object;)Z
  #81 = Utf8               pop
  #82 = Utf8               ()Ljava/lang/Object;
  #83 = Utf8               intValue
  #84 = Utf8               ()I
  #85 = Utf8               valueOf
  #86 = Utf8               (I)Ljava/lang/Integer;
  #87 = Utf8               push
  #88 = Utf8               (Ljava/lang/Object;)Ljava/lang/Object;
  #89 = Utf8               trim
  #90 = Utf8               ()Ljava/lang/String;
  #91 = Utf8               java/lang/System
  #92 = Utf8               out
  #93 = Utf8               Ljava/io/PrintStream;
  #94 = Utf8               java/io/PrintStream
  #95 = Utf8               println
  #96 = Utf8               (I)V
{
  java.util.Stack stack;
    descriptor: Ljava/util/Stack;
    flags:
    Signature: #33                          // Ljava/util/Stack;
int length;

descriptor: I

flags:
int result;

descriptor: I

flags:
public niukeWeb.evalRPN();

descriptor: ()V

flags: ACC_PUBLIC

Code:

stack=3,locals=1,args_size=1

0: aload_0

1: invokespecial #1                  // Method java/lang/Object."":()V

4: aload_0

5: new           #2                  // class java/util/Stack

8: dup

9: invokespecial #3                  // Method java/util/Stack."":()V

12: putfield      #4                  // Field stack:Ljava/util/Stack;

15: return

LineNumberTable:

line 11: 0

line 12: 4
int evalRPN(java.lang.String[]);

descriptor: ([Ljava/lang/String;)I

flags:

Code:

stack=3,locals=5,args_size=2

0: aload_0

1: aload_1

2: arraylength

3: putfield      #5                  // Field length:I

6: aload_0

7: getfield      #5                  // Field length:I

10: iconst_1

11: if_icmpne     21

14: aload_1

15: iconst_0

16: aaload

17: invokestatic  #6                  // Method java/lang/Integer.parseInt:(Ljava/lang/String;)I

20: ireturn

21: iconst_0

22: istore_2

23: iload_2

24: aload_0

25: getfield      #5                  // Field length:I

28: if_icmpge     321

31: aload_1

32: iload_2

33: aaload

34: ldc           #7                  // String +

36: invokevirtual #8                  // Method java/lang/String.equals:(Ljava/lang/Object;)Z

39: ifeq          97

42: aload_0

43: getfield      #4                  // Field stack:Ljava/util/Stack;

46: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

49: checkcast     #10                 // class java/lang/Integer

52: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

55: istore_3

56: aload_0

57: getfield      #4                  // Field stack:Ljava/util/Stack;

60: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

63: checkcast     #10                 // class java/lang/Integer

66: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

69: istore        4

71: aload_0

72: iload_3

73: iload         4

75: iadd

76: putfield      #12                 // Field result:I

79: aload_0

80: getfield      #4                  // Field stack:Ljava/util/Stack;

83: aload_0

84: getfield      #12                 // Field result:I

87: invokestatic  #13                 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;

90: invokevirtual #14                 // Method java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;

93: pop

94: goto          315

97: aload_1

98: iload_2

99: aaload

100: ldc           #15                 // String -

102: invokevirtual #8                  // Method java/lang/String.equals:(Ljava/lang/Object;)Z

105: ifeq          163

108: aload_0

109: getfield      #4                  // Field stack:Ljava/util/Stack;

112: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

115: checkcast     #10                 // class java/lang/Integer

118: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

121: istore_3

122: aload_0

123: getfield      #4                  // Field stack:Ljava/util/Stack;

126: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

129: checkcast     #10                 // class java/lang/Integer

132: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

135: istore        4

137: aload_0

138: iload         4

140: iload_3

141: isub

142: putfield      #12                 // Field result:I

145: aload_0

146: getfield      #4                  // Field stack:Ljava/util/Stack;

149: aload_0

150: getfield      #12                 // Field result:I

153: invokestatic  #13                 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;

156: invokevirtual #14                 // Method java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;

159: pop

160: goto          315

163: aload_1

164: iload_2

165: aaload

166: ldc           #16                 // String 

168: invokevirtual #8                  // Method java/lang/String.equals:(Ljava/lang/Object;)Z

171: ifeq          229

174: aload_0

175: getfield      #4                  // Field stack:Ljava/util/Stack;

178: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

181: checkcast     #10                 // class java/lang/Integer

184: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

187: istore_3

188: aload_0

189: getfield      #4                  // Field stack:Ljava/util/Stack;

192: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

195: checkcast     #10                 // class java/lang/Integer

198: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

201: istore        4

203: aload_0

204: iload_3

205: iload         4

207: imul

208: putfield      #12                 // Field result:I

211: aload_0

212: getfield      #4                  // Field stack:Ljava/util/Stack;

215: aload_0

216: getfield      #12                 // Field result:I

219: invokestatic  #13                 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;

222: invokevirtual #14                 // Method java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;

225: pop

226: goto          315

229: aload_1

230: iload_2

231: aaload

232: ldc           #17                 // String /

234: invokevirtual #8                  // Method java/lang/String.equals:(Ljava/lang/Object;)Z

237: ifeq          295

240: aload_0

241: getfield      #4                  // Field stack:Ljava/util/Stack;

244: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

247: checkcast     #10                 // class java/lang/Integer

250: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

253: istore_3

254: aload_0

255: getfield      #4                  // Field stack:Ljava/util/Stack;

258: invokevirtual #9                  // Method java/util/Stack.pop:()Ljava/lang/Object;

261: checkcast     #10                 // class java/lang/Integer

264: invokevirtual #11                 // Method java/lang/Integer.intValue:()I

267: istore        4

269: aload_0

270: iload         4

272: iload_3

273: idiv

274: putfield      #12                 // Field result:I

277: aload_0

278: getfield      #4                  // Field stack:Ljava/util/Stack;

281: aload_0

282: getfield      #12                 // Field result:I

285: invokestatic  #13                 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;

288: invokevirtual #14                 // Method java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;

291: pop

292: goto          315

295: aload_0

296: getfield      #4                  // Field stack:Ljava/util/Stack;

299: aload_1

300: iload_2

301: aaload

302: invokevirtual #18                 // Method java/lang/String.trim:()Ljava/lang/String;

305: invokestatic  #6                  // Method java/lang/Integer.parseInt:(Ljava/lang/String;)I

308: invokestatic  #13                 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;

311: invokevirtual #14                 // Method java/util/Stack.push:(Ljava/lang/Object;)Ljava/lang/Object;

314: pop

315: iinc          2,1

318: goto          23

321: aload_0

322: getfield      #12                 // Field result:I

325: ireturn

LineNumberTable:

line 16: 0

line 17: 6

line 19: 21

line 20: 31

line 21: 42

line 22: 56

line 23: 71

line 24: 79

line 25: 94

line 26: 108

line 27: 122

line 28: 137

line 29: 145

line 30: 160

line 31: 174

line 32: 188

line 33: 203

line 34: 211

line 35: 226

line 36: 240

line 37: 254

line 38: 269

line 39: 277

line 40: 292

line 42: 295

line 19: 315

line 45: 321

StackMapTable: number_of_entries = 8

frame_type = 21 / same /

frame_type = 252 / append /

offset_delta = 1

locals = [ int ]

frame_type = 251 / same_frame_extended /

offset_delta = 73

frame_type = 251 / same_frame_extended /

offset_delta = 65

frame_type = 251 / same_frame_extended /

offset_delta = 65

frame_type = 251 / same_frame_extended /

offset_delta = 65

frame_type = 19 / same /

frame_type = 250 / chop */

offset_delta = 5
public static void main(java.lang.String[]);

descriptor: ([Ljava/lang/String;)V

flags: ACC_PUBLIC,ACC_STATIC

Code:

stack=4,locals=8,args_size=1

0: new           #19                 // class niukeWeb/evalRPN

3: dup

4: invokespecial #20                 // Method "":()V

7: astore_1

8: iconst_5

9: anewarray     #21                 // class java/lang/String

12: dup

13: iconst_0

14: ldc           #22                 // String 2

16: aastore

17: dup

18: iconst_1

19: ldc           #23                 // String 1

21: aastore

22: dup

23: iconst_2

24: ldc           #7                  // String +

26: aastore

27: dup

28: iconst_3

29: ldc           #24                 // String 3

31: aastore

32: dup

33: iconst_4

34: ldc           #16                 // String *

36: aastore

37: astore_2

38: aload_1

39: aload_2

40: invokevirtual #25                 // Method evalRPN:([Ljava/lang/String;)I

43: istore_3

44: getstatic     #26                 // Field java/lang/System.out:Ljava/io/PrintStream;

47: iload_3

48: invokevirtual #27                 // Method java/io/PrintStream.println:(I)V

51: iconst_1

52: anewarray     #21                 // class java/lang/String

55: dup

56: iconst_0

57: ldc           #22                 // String 2

59: aastore

60: astore        4

62: aload_1

63: aload         4

65: invokevirtual #25                 // Method evalRPN:([Ljava/lang/String;)I

68: istore        5

70: getstatic     #26                 // Field java/lang/System.out:Ljava/io/PrintStream;

73: iload         5

75: invokevirtual #27                 // Method java/io/PrintStream.println:(I)V

78: iconst_3

79: anewarray     #21                 // class java/lang/String

82: dup

83: iconst_0

84: ldc           #28                 // String 0

86: aastore

87: dup

88: iconst_1

89: ldc           #24                 // String 3

91: aastore

92: dup

93: iconst_2

94: ldc           #17                 // String /

96: aastore

97: astore        6

99: aload_1

100: aload         6

102: invokevirtual #25                 // Method evalRPN:([Ljava/lang/String;)I

105: istore        7

107: getstatic     #26                 // Field java/lang/System.out:Ljava/io/PrintStream;

110: iload         7

112: invokevirtual #27                 // Method java/io/PrintStream.println:(I)V

115: return

LineNumberTable:

line 49: 0

line 50: 8

line 51: 38

line 52: 44

line 54: 51

line 55: 62

line 56: 70

line 58: 78

line 59: 99

line 60: 107

line 61: 115

}

SourceFile: "evalRPN.java"

cxhdeMacBook-Air:niukeweb caoxiaohong$ 

到此，查看.class字节码的准备工作就做完了，通过分析字节码信息来分析.class文件中常量等信息。

（编辑：李大同）

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