Java Language
विघटित और विघटित करना
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वाक्य - विन्यास
- javap [विकल्प] <कक्षाएं>
पैरामीटर
| नाम | विवरण |
|---|---|
<classes> | अलग करने के लिए कक्षाओं की सूची। या तो में किया जा सकता है package1.package2.Classname प्रारूप, या package1/package2/Classname प्रारूप। .class एक्सटेंशन को शामिल न करें। |
-help , --help , -? | इस उपयोग संदेश को प्रिंट करें |
-version | संस्करण जानकारी |
-v , -verbose | अतिरिक्त जानकारी प्रिंट करें |
-l | प्रिंट लाइन नंबर और स्थानीय चर तालिकाएं |
-public | केवल सार्वजनिक वर्गों और सदस्यों को दिखाएं |
-protected | संरक्षित / सार्वजनिक वर्गों और सदस्यों को दिखाएं |
-package | पैकेज दिखाएँ / संरक्षित / सार्वजनिक वर्ग और सदस्य (डिफ़ॉल्ट) |
-p , -private | सभी वर्गों और सदस्यों को दिखाएं |
-c | कोड डिसाइड करें |
-s | आंतरिक प्रकार के हस्ताक्षर प्रिंट करें |
-sysinfo | क्लास की प्रक्रिया की जानकारी (पथ, आकार, तिथि, एमडी 5 हैश) संसाधित की जा रही है |
-constants | अंतिम स्थिरांक दिखाएं |
-classpath <path> | निर्दिष्ट करें कि उपयोगकर्ता वर्ग फ़ाइलों को कहाँ खोजें |
-cp <path> | निर्दिष्ट करें कि उपयोगकर्ता वर्ग फ़ाइलों को कहाँ खोजें |
-bootclasspath <path> | बूटस्ट्रैप क्लास फ़ाइलों का ओवरराइड स्थान |
जावप के साथ बायोटेक देखना
यदि आप जावा प्रोग्राम के लिए जेनरेट किया गया javap देखना चाहते हैं, तो आप इसे देखने के लिए दिए गए javap कमांड का उपयोग कर सकते हैं।
यह मानते हुए कि हमारे पास निम्न जावा स्रोत फ़ाइल है:
package com.stackoverflow.documentation;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
@Service
public class HelloWorldService {
public void sayHello() {
System.out.println("Hello, World!");
}
private Object[] pvtMethod(List<String> strings) {
return new Object[]{strings};
}
protected String tryCatchResources(String filename) throws IOException {
try (InputStream inputStream = getClass().getResourceAsStream(filename)) {
byte[] bytes = new byte[8192];
int read = inputStream.read(bytes);
return new String(bytes, 0, read);
} catch (IOException | RuntimeException e) {
e.printStackTrace();
throw e;
}
}
void stuff() {
System.out.println("stuff");
}
}
स्रोत फ़ाइल संकलित करने के बाद, सबसे सरल उपयोग है:
cd <directory containing classes> (e.g. target/classes)
javap com/stackoverflow/documentation/SpringExample
जिससे उत्पादन होता है
Compiled from "HelloWorldService.java"
public class com.stackoverflow.documentation.HelloWorldService {
public com.stackoverflow.documentation.HelloWorldService();
public void sayHello();
protected java.lang.String tryCatchResources(java.lang.String) throws java.io.IOException;
void stuff();
}
यह कक्षा में सभी गैर-निजी तरीकों को सूचीबद्ध करता है, लेकिन यह विशेष रूप से अधिकांश उद्देश्यों के लिए उपयोगी नहीं है। निम्नलिखित आदेश बहुत अधिक उपयोगी है:
javap -p -c -s -constants -l -v com/stackoverflow/documentation/HelloWorldService
जो उत्पादन का उत्पादन करता है:
Classfile /Users/pivotal/IdeaProjects/stackoverflow-spring-docs/target/classes/com/stackoverflow/documentation/HelloWorldService.class
Last modified Jul 22, 2016; size 2167 bytes
MD5 checksum 6e33b5c292ead21701906353b7f06330
Compiled from "HelloWorldService.java"
public class com.stackoverflow.documentation.HelloWorldService
minor version: 0
major version: 51
flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
#1 = Methodref #5.#60 // java/lang/Object."<init>":()V
#2 = Fieldref #61.#62 // java/lang/System.out:Ljava/io/PrintStream;
#3 = String #63 // Hello, World!
#4 = Methodref #64.#65 // java/io/PrintStream.println:(Ljava/lang/String;)V
#5 = Class #66 // java/lang/Object
#6 = Methodref #5.#67 // java/lang/Object.getClass:()Ljava/lang/Class;
#7 = Methodref #68.#69 // java/lang/Class.getResourceAsStream:(Ljava/lang/String;)Ljava/io/InputStream;
#8 = Methodref #70.#71 // java/io/InputStream.read:([B)I
#9 = Class #72 // java/lang/String
#10 = Methodref #9.#73 // java/lang/String."<init>":([BII)V
#11 = Methodref #70.#74 // java/io/InputStream.close:()V
#12 = Class #75 // java/lang/Throwable
#13 = Methodref #12.#76 // java/lang/Throwable.addSuppressed:(Ljava/lang/Throwable;)V
#14 = Class #77 // java/io/IOException
#15 = Class #78 // java/lang/RuntimeException
#16 = Methodref #79.#80 // java/lang/Exception.printStackTrace:()V
#17 = String #55 // stuff
#18 = Class #81 // com/stackoverflow/documentation/HelloWorldService
#19 = Utf8 <init>
#20 = Utf8 ()V
#21 = Utf8 Code
#22 = Utf8 LineNumberTable
#23 = Utf8 LocalVariableTable
#24 = Utf8 this
#25 = Utf8 Lcom/stackoverflow/documentation/HelloWorldService;
#26 = Utf8 sayHello
#27 = Utf8 pvtMethod
#28 = Utf8 (Ljava/util/List;)[Ljava/lang/Object;
#29 = Utf8 strings
#30 = Utf8 Ljava/util/List;
#31 = Utf8 LocalVariableTypeTable
#32 = Utf8 Ljava/util/List<Ljava/lang/String;>;
#33 = Utf8 Signature
#34 = Utf8 (Ljava/util/List<Ljava/lang/String;>;)[Ljava/lang/Object;
#35 = Utf8 tryCatchResources
#36 = Utf8 (Ljava/lang/String;)Ljava/lang/String;
#37 = Utf8 bytes
#38 = Utf8 [B
#39 = Utf8 read
#40 = Utf8 I
#41 = Utf8 inputStream
#42 = Utf8 Ljava/io/InputStream;
#43 = Utf8 e
#44 = Utf8 Ljava/lang/Exception;
#45 = Utf8 filename
#46 = Utf8 Ljava/lang/String;
#47 = Utf8 StackMapTable
#48 = Class #81 // com/stackoverflow/documentation/HelloWorldService
#49 = Class #72 // java/lang/String
#50 = Class #82 // java/io/InputStream
#51 = Class #75 // java/lang/Throwable
#52 = Class #38 // "[B"
#53 = Class #83 // java/lang/Exception
#54 = Utf8 Exceptions
#55 = Utf8 stuff
#56 = Utf8 SourceFile
#57 = Utf8 HelloWorldService.java
#58 = Utf8 RuntimeVisibleAnnotations
#59 = Utf8 Lorg/springframework/stereotype/Service;
#60 = NameAndType #19:#20 // "<init>":()V
#61 = Class #84 // java/lang/System
#62 = NameAndType #85:#86 // out:Ljava/io/PrintStream;
#63 = Utf8 Hello, World!
#64 = Class #87 // java/io/PrintStream
#65 = NameAndType #88:#89 // println:(Ljava/lang/String;)V
#66 = Utf8 java/lang/Object
#67 = NameAndType #90:#91 // getClass:()Ljava/lang/Class;
#68 = Class #92 // java/lang/Class
#69 = NameAndType #93:#94 // getResourceAsStream:(Ljava/lang/String;)Ljava/io/InputStream;
#70 = Class #82 // java/io/InputStream
#71 = NameAndType #39:#95 // read:([B)I
#72 = Utf8 java/lang/String
#73 = NameAndType #19:#96 // "<init>":([BII)V
#74 = NameAndType #97:#20 // close:()V
#75 = Utf8 java/lang/Throwable
#76 = NameAndType #98:#99 // addSuppressed:(Ljava/lang/Throwable;)V
#77 = Utf8 java/io/IOException
#78 = Utf8 java/lang/RuntimeException
#79 = Class #83 // java/lang/Exception
#80 = NameAndType #100:#20 // printStackTrace:()V
#81 = Utf8 com/stackoverflow/documentation/HelloWorldService
#82 = Utf8 java/io/InputStream
#83 = Utf8 java/lang/Exception
#84 = Utf8 java/lang/System
#85 = Utf8 out
#86 = Utf8 Ljava/io/PrintStream;
#87 = Utf8 java/io/PrintStream
#88 = Utf8 println
#89 = Utf8 (Ljava/lang/String;)V
#90 = Utf8 getClass
#91 = Utf8 ()Ljava/lang/Class;
#92 = Utf8 java/lang/Class
#93 = Utf8 getResourceAsStream
#94 = Utf8 (Ljava/lang/String;)Ljava/io/InputStream;
#95 = Utf8 ([B)I
#96 = Utf8 ([BII)V
#97 = Utf8 close
#98 = Utf8 addSuppressed
#99 = Utf8 (Ljava/lang/Throwable;)V
#100 = Utf8 printStackTrace
{
public com.stackoverflow.documentation.HelloWorldService();
descriptor: ()V
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 10: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/stackoverflow/documentation/HelloWorldService;
public void sayHello();
descriptor: ()V
flags: ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3 // String Hello, World!
5: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 13: 0
line 14: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/stackoverflow/documentation/HelloWorldService;
private java.lang.Object[] pvtMethod(java.util.List<java.lang.String>);
descriptor: (Ljava/util/List;)[Ljava/lang/Object;
flags: ACC_PRIVATE
Code:
stack=4, locals=2, args_size=2
0: iconst_1
1: anewarray #5 // class java/lang/Object
4: dup
5: iconst_0
6: aload_1
7: aastore
8: areturn
LineNumberTable:
line 17: 0
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/stackoverflow/documentation/HelloWorldService;
0 9 1 strings Ljava/util/List;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 9 1 strings Ljava/util/List<Ljava/lang/String;>;
Signature: #34 // (Ljava/util/List<Ljava/lang/String;>;)[Ljava/lang/Object;
protected java.lang.String tryCatchResources(java.lang.String) throws java.io.IOException;
descriptor: (Ljava/lang/String;)Ljava/lang/String;
flags: ACC_PROTECTED
Code:
stack=5, locals=10, args_size=2
0: aload_0
1: invokevirtual #6 // Method java/lang/Object.getClass:()Ljava/lang/Class;
4: aload_1
5: invokevirtual #7 // Method java/lang/Class.getResourceAsStream:(Ljava/lang/String;)Ljava/io/InputStream;
8: astore_2
9: aconst_null
10: astore_3
11: sipush 8192
14: newarray byte
16: astore 4
18: aload_2
19: aload 4
21: invokevirtual #8 // Method java/io/InputStream.read:([B)I
24: istore 5
26: new #9 // class java/lang/String
29: dup
30: aload 4
32: iconst_0
33: iload 5
35: invokespecial #10 // Method java/lang/String."<init>":([BII)V
38: astore 6
40: aload_2
41: ifnull 70
44: aload_3
45: ifnull 66
48: aload_2
49: invokevirtual #11 // Method java/io/InputStream.close:()V
52: goto 70
55: astore 7
57: aload_3
58: aload 7
60: invokevirtual #13 // Method java/lang/Throwable.addSuppressed:(Ljava/lang/Throwable;)V
63: goto 70
66: aload_2
67: invokevirtual #11 // Method java/io/InputStream.close:()V
70: aload 6
72: areturn
73: astore 4
75: aload 4
77: astore_3
78: aload 4
80: athrow
81: astore 8
83: aload_2
84: ifnull 113
87: aload_3
88: ifnull 109
91: aload_2
92: invokevirtual #11 // Method java/io/InputStream.close:()V
95: goto 113
98: astore 9
100: aload_3
101: aload 9
103: invokevirtual #13 // Method java/lang/Throwable.addSuppressed:(Ljava/lang/Throwable;)V
106: goto 113
109: aload_2
110: invokevirtual #11 // Method java/io/InputStream.close:()V
113: aload 8
115: athrow
116: astore_2
117: aload_2
118: invokevirtual #16 // Method java/lang/Exception.printStackTrace:()V
121: aload_2
122: athrow
Exception table:
from to target type
48 52 55 Class java/lang/Throwable
11 40 73 Class java/lang/Throwable
11 40 81 any
91 95 98 Class java/lang/Throwable
73 83 81 any
0 70 116 Class java/io/IOException
0 70 116 Class java/lang/RuntimeException
73 116 116 Class java/io/IOException
73 116 116 Class java/lang/RuntimeException
LineNumberTable:
line 21: 0
line 22: 11
line 23: 18
line 24: 26
line 25: 40
line 21: 73
line 25: 81
line 26: 117
line 27: 121
LocalVariableTable:
Start Length Slot Name Signature
18 55 4 bytes [B
26 47 5 read I
9 107 2 inputStream Ljava/io/InputStream;
117 6 2 e Ljava/lang/Exception;
0 123 0 this Lcom/stackoverflow/documentation/HelloWorldService;
0 123 1 filename Ljava/lang/String;
StackMapTable: number_of_entries = 9
frame_type = 255 /* full_frame */
offset_delta = 55
locals = [ class com/stackoverflow/documentation/HelloWorldService, class java/lang/String, class java/io/InputStream, class java/lang/Throwable, class "[B", int, class java/lang/String ]
stack = [ class java/lang/Throwable ]
frame_type = 10 /* same */
frame_type = 3 /* same */
frame_type = 255 /* full_frame */
offset_delta = 2
locals = [ class com/stackoverflow/documentation/HelloWorldService, class java/lang/String, class java/io/InputStream, class java/lang/Throwable ]
stack = [ class java/lang/Throwable ]
frame_type = 71 /* same_locals_1_stack_item */
stack = [ class java/lang/Throwable ]
frame_type = 255 /* full_frame */
offset_delta = 16
locals = [ class com/stackoverflow/documentation/HelloWorldService, class java/lang/String, class java/io/InputStream, class java/lang/Throwable, top, top, top, top, class java/lang/Throwable ]
stack = [ class java/lang/Throwable ]
frame_type = 10 /* same */
frame_type = 3 /* same */
frame_type = 255 /* full_frame */
offset_delta = 2
locals = [ class com/stackoverflow/documentation/HelloWorldService, class java/lang/String ]
stack = [ class java/lang/Exception ]
Exceptions:
throws java.io.IOException
void stuff();
descriptor: ()V
flags:
Code:
stack=2, locals=1, args_size=1
0: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #17 // String stuff
5: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 32: 0
line 33: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/stackoverflow/documentation/HelloWorldService;
}
SourceFile: "HelloWorldService.java"
RuntimeVisibleAnnotations:
0: #59()
Modified text is an extract of the original Stack Overflow Documentation
के तहत लाइसेंस प्राप्त है CC BY-SA 3.0
से संबद्ध नहीं है Stack Overflow