最近在研究Java汇编，特意重网上收集了写资料，供后面进一步深入研究学习用。
1、跳转到class文件目录，使用如下指令，可以获取到生成的字节码
javap -c StringTest.class -> p.txt
2、实例
Hello.java文件
public class?Hello
{
static void main(String args[])
{
int i=10;
int j=100;
int m=i+j;
System.out.println("m:"+m);
}
int get()
{
int a=1;
int b=2;
int c=3;
int d=4;
int e=5;
int f=6;
int n=a+b+c+d+e+f;
return n;
}
static int get2()
{
int a=1;
int b=12;
int c=39;
int d=a+b;
return d;
}
}
然后再执行以下命令：
javac Hello.java
javap -c Hello
得到
Compiled from "Hello.java"
public class Hello extends java.lang.Object{
public Hello();
Code:
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return
static void main(java.lang.String[]);
Code:
0: bipush 10
2: istore_1
3: bipush 100
5: istore_2
6: iload_1
7: iload_2
8: iadd
9: istore_3
10: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream;
13: new #3; //class java/lang/StringBuilder
16: dup
17: invokespecial #4; //Method java/lang/StringBuilder."<init>":()V
20: ldc #5; //String m:
22: invokevirtual #6; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
25: iload_3
26: invokevirtual #7; //Method java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
29: invokevirtual #8; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
32: invokevirtual #9; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
35: return
int get();
Code:
0: iconst_1
1: istore_1
2: iconst_2
3: istore_2
4: iconst_3
5: istore_3
6: iconst_4
7: istore 4
9: iconst_5
10: istore 5
12: bipush 6
14: istore 6
16: iload_1
17: iload_2
18: iadd
19: iload_3
20: iadd
21: iload 4
23: iadd
24: iload 5
26: iadd
27: iload 6
29: iadd
30: istore 7
32: iload 7
34: ireturn
static int get2();
Code:
0: iconst_1
1: istore_0
2: bipush 12
4: istore_1
5: bipush 39
7: istore_2
8: iload_0
9: iload_1
10: iadd
11: istore_3
12: iload_3
13: ireturn
}