javap-c-v-l-shelloworld.class不'；不显示LocalVariableTable
我试图理解Java字节码。我使用命令javap-c-v-l-shelloworld.class不'；不显示LocalVariableTable,java,javap,Java,Javap,我试图理解Java字节码。我使用命令javap-c-v-l-shelloworld.class分析我的简单HelloWorld。但是，我无法看到LocalVariableTable条目。为什么呢？它被忽视了吗？我正在OSX10.10.4上运行Java1.8.045。谢谢你的帮助，谢谢 1 public class HelloWorld { 2 3 public static void main(String[] args) { 4
javap-c-v-l-shelloworld.class 1 public class HelloWorld {
2
3 public static void main(String[] args) {
4 String str = "Hello ";
5 System.out.println(str + args[0]);
6 }
7 }
Last modified Aug 2, 2015; size 590 bytes
MD5 checksum 59cf5ec143d5c28898d6b9bec3140379
Compiled from "HelloWorld.java"
public class HelloWorld
minor version: 0
major version: 52
flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
#1 = Methodref #10.#19 // java/lang/Object."<init>":()V
#2 = String #20 // Hello
#3 = Fieldref #21.#22 // java/lang/System.out:Ljava/io/PrintStream;
#4 = Class #23 // java/lang/StringBuilder
#5 = Methodref #4.#19 // java/lang/StringBuilder."<init>":()V
#6 = Methodref #4.#24 // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
#7 = Methodref #4.#25 // java/lang/StringBuilder.toString:()Ljava/lang/String;
#8 = Methodref #26.#27 // java/io/PrintStream.println:(Ljava/lang/String;)V
#9 = Class #28 // HelloWorld
#10 = Class #29 // java/lang/Object
#11 = Utf8 <init>
#12 = Utf8 ()V
#13 = Utf8 Code
#14 = Utf8 LineNumberTable
#15 = Utf8 main
#16 = Utf8 ([Ljava/lang/String;)V
#17 = Utf8 SourceFile
#18 = Utf8 HelloWorld.java
#19 = NameAndType #11:#12 // "<init>":()V
#20 = Utf8 Hello
#21 = Class #30 // java/lang/System
#22 = NameAndType #31:#32 // out:Ljava/io/PrintStream;
#23 = Utf8 java/lang/StringBuilder
#24 = NameAndType #33:#34 // append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
#25 = NameAndType #35:#36 // toString:()Ljava/lang/String;
#26 = Class #37 // java/io/PrintStream
#27 = NameAndType #38:#39 // println:(Ljava/lang/String;)V
#28 = Utf8 HelloWorld
#29 = Utf8 java/lang/Object
#30 = Utf8 java/lang/System
#31 = Utf8 out
#32 = Utf8 Ljava/io/PrintStream;
#33 = Utf8 append
#34 = Utf8 (Ljava/lang/String;)Ljava/lang/StringBuilder;
#35 = Utf8 toString
#36 = Utf8 ()Ljava/lang/String;
#37 = Utf8 java/io/PrintStream
#38 = Utf8 println
#39 = Utf8 (Ljava/lang/String;)V
{
public HelloWorld();
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 1: 0
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
flags: ACC_PUBLIC, ACC_STATIC
Code:
stack=4, locals=2, args_size=1
0: ldc #2 // String Hello
2: astore_1
3: getstatic #3 // Field java/lang/System.out:Ljava/io/PrintStream;
6: new #4 // class java/lang/StringBuilder
9: dup
10: invokespecial #5 // Method java/lang/StringBuilder."<init>":()V
13: aload_1
14: invokevirtual #6 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
17: aload_0
18: iconst_0
19: aaload
20: invokevirtual #6 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
23: invokevirtual #7 // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
26: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
29: return
LineNumberTable:
line 4: 0
line 5: 3
line 6: 29
}
SourceFile: "HelloWorld.java"
上次修改日期2015年8月2日；大小590字节
MD5校验和59cf5ec143d5c28898d6b9bec3140379
从“HelloWorld.java”编译而来
公共类HelloWorld
次要版本：0
主要版本：52
旗帜：ACC_公共、ACC_超级
固定池：
#1=Methodref#10.#19//java/lang/Object.“：（）V
#2=字符串#20//您好
#3=Fieldref#21.#22//java/lang/System.out:Ljava/io/PrintStream；
#4=类#23//java/lang/StringBuilder
#5=Methodref#4.#19//java/lang/StringBuilder。”“：（）V
#6=Methodref#4.#24//java/lang/StringBuilder.append:（Ljava/lang/String；）Ljava/lang/StringBuilder；
#7=Methodref#4.#25//java/lang/StringBuilder.toString:（）Ljava/lang/String；
#8=Methodref#26.#27//java/io/PrintStream.println:（Ljava/lang/String；）V
#9=类#28//HelloWorld
#10=类#29//java/lang/Object
#11=Utf8
#12=Utf8（）V
#13=Utf8代码
#14=Utf8行号表
#15=Utf8主
#16=Utf8（[Ljava/lang/String；）V
#17=Utf8源文件
#18=Utf8 HelloWorld.java
#19=名称和类型#11:#12/“”：（）V
#20=Utf8你好
#21=类#30//java/lang/System
#22=名称和类型#31:#32//out:Ljava/io/PrintStream；
#23=Utf8 java/lang/StringBuilder
#24=名称和类型#33:#34//append:（Ljava/lang/String；）Ljava/lang/StringBuilder；
#25=名称和类型#35:#36//toString:（）Ljava/lang/String；
#26=类#37//java/io/PrintStream
#27=名称和类型#38:#39//println:（Ljava/lang/String；）V
#28=Utf8 HelloWorld
#29=Utf8 java/lang/Object
#30=Utf8 java/lang/System
#31=Utf8输出
#32=Utf8 Ljava/io/PrintStream；
#33=Utf8追加
#34=Utf8（Ljava/lang/String；）Ljava/lang/StringBuilder；
#35=Utf8 toString
#36=Utf8（）Ljava/lang/String；
#37=Utf8 java/io/PrintStream
#38=Utf8打印LN
#39=Utf8（Ljava/lang/String；）V
{
公共HelloWorld（）；
描述符：（）V
旗帜：ACC_PUBLIC
代码：
堆栈=1，局部变量=1，参数大小=1
0:aload_0
1:invokespecial#1//方法java/lang/Object。“：（）V
4：返回
LineNumberTable：
第1行：0
公共静态void main（java.lang.String[]）；
描述符：（[Ljava/lang/String；）V
标志：ACC_公共，ACC_静态
代码：
堆栈=4，局部变量=2，参数大小=1
0:ldc#2//字符串你好
2:astore_1
3:getstatic#3//fieldjava/lang/System.out:Ljava/io/PrintStream；
6:new#4//class java/lang/StringBuilder
9:dup
10:invokespecial#5//方法java/lang/StringBuilder。”“：（）V
13:aload_1
14:invokevirtual#6//方法java/lang/StringBuilder.append:（Ljava/lang/String；）Ljava/lang/StringBuilder；
17:aload_0
18:iconst_0
19:aaload
20:invokevirtual#6//方法java/lang/StringBuilder.append:（Ljava/lang/String；）Ljava/lang/StringBuilder；
23:invokevirtual#7//方法java/lang/StringBuilder.toString:（）Ljava/lang/String；
26:invokevirtual#8//方法java/io/PrintStream.println:（Ljava/lang/String；）V
29：返回
LineNumberTable：
第4行：0
第5行：3
第6行：29
}
源文件：“HelloWorld.java”
我相信您需要使用相应的选项编译代码。谢谢，使用javac-g HelloWorld.java编译代码解决了这个问题。