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<![endif]-->
javap
是
jdk
默认的一个工具,在
jdk
安装目录的
bin
文件夹下。通过该工具可以查看
java
编译器为我们生成的字节码,通过比较字节码和源代码来了解很多编译器内部的工作机制。
javap
的标准输出是公有变量和类的成员函数。
javap
反汇编器的命令行使用如下:
用法:
javap
<
选项功能
>
<
类
> ...
详细用法可以通过
javap –help
来查看。
下面将通过简单的
helloworld
程序使用
javap
工具来加深认识,程序源代码如下:
package
pak1;
public
class
Test1 {
/**
*
@param
args
*/
public
static
void
main(String[] args) {
//
TODO
Auto-generated method stub
String s1 =
"Hello World"
;
System.
out
.println(s1);
}
}
1
、
javap Test1
Compiled
from "Test1.java"
public
class pak1.Test1 extends java.lang.Object{
public pak1.Test1();
public static void
main(java.lang.String[]);
}
从上述结果中我们可以看出,如果类没有显示的从其它类派生那么它就是从
Object
派生。如果没有为类显示的申明构造方法,那么编译器将为之生成一个缺省构造方法(不带参数的构造方法)。
2
、
javap -c Test1
Compiled
from "Test1.java"
public
class pak1.Test1 extends java.lang.Object{
public
pak1.Test1();
Code:
0:
aload_0
1:
invokespecial
#8; //Method
java/lang/Object."<init>":()V
4:
return
public
static void main(java.lang.String[]);
Code:
0:
ldc
#16; //String Hello World
2:
astore_1
3:
getstatic
#18; //Field
java/lang/System.out:Ljava/io/PrintStream;
6:
aload_1
7:
invokevirtual
#24; //Method
java/io/PrintStream.println:(Ljava/lang/String;)V
10:
return
}
-c
参数表示反汇编代码。
该命令显示了方法的具体的字节码,关于这些字节码的详细涵义在
Java
虚拟机规范中定义。例如
main()
方法中
ldc
表示压入常数池中的项
s1
。
3
、
javap -l test1
Compiled
from "Test1.java"
public
class pak1.Test1 extends java.lang.Object{
public
pak1.Test1();
LineNumberTable:
line 3: 0
LocalVariableTable:
Start
Length
Slot
Name
Signature
0
5
0
this
Lpak1/Test1;
public
static void main(java.lang.String[]);
LineNumberTable:
line 10: 0
line 11: 3
line 12: 10
LocalVariableTable:
Start
Length
Slot
Name
Signature
0
11
0
args
[Ljava/lang/String;
3
8
1
s1
Ljava/lang/String;
}
-l
参数将显示行号和局部变量表。
从上面的输出中我们可以得到方法中的变量和方法的源代码对于字节码信息的,例如对应
main()
方法,它的变量为输入参数
args
以及局部变量
s1
,方法的源代码的第
10
行对应字节码的第
0
个偏移量,第
11
行对应字节码的第
3
个偏移量,而第
12
行对应字节码的第
10
偏移量(参看
javap -c
的输出前面的偏移量),第
12
行实际是没有语句的,但是有一个隐含的
return
,而偏移量
10
实际对应的也是
return
调用。
4
、
javap -p test1
Compiled
from "Test1.java"
public
class pak1.Test1 extends java.lang.Object{
public pak1.Test1();
public static void
main(java.lang.String[]);
}
-p
参数将额外的打印
private
成员和方法的信息,因为这个类没有因此输出相同。