我需要创建一个类似于JAR包中的方法。由于没有源代码,所以我使用JD-GUI进行反编译学习。
private static boolean checkMe(Date paramDate, String paramString)
throws REUException {
int i = 1;
int j, k;
// unrelated stuff
if (j > k)
i = 0;
return i;
}
您可以在方法签名中看到应该返回一个
布尔值(boolean)
,但实际上它返回了一个整数(int)
,这在Java中是不被允许的。所以,我认为JD-GUI可能有问题。
我尝试使用javap
进行反汇编,但我仍然没有头绪:
输入:javap -c -s -verbose -private Class
我得到:
private static boolean checkMe(java.util.Date, java.lang.String) throws reu.exceptions.REUException;
Signature: (Ljava/util/Date;Ljava/lang/String;)Z
Code:
Stack=4, Locals=7, Args_size=2
0: iconst_1
1: istore_2
2: getstatic #34; //Field iniciado:Z
5: ifne 44
8: ldc_w #35; //class reu/modulos/STDWDATES
11: dup
12: astore_3
13: monitorenter
14: getstatic #34; //Field iniciado:Z
17: ifne 32
20: new #35; //class reu/modulos/STDWDATES
23: dup
24: invokespecial #36; //Method "<init>":()V
27: pop
28: iconst_1
29: putstatic #34; //Field iniciado:Z
32: aload_3
33: monitorexit
34: goto 44
37: astore 4
39: aload_3
40: monitorexit
41: aload 4
43: athrow
44: aconst_null
45: getstatic #37; //Field AlmacenFechaCal:Ljava/util/HashMap;
48: aload_1
49: invokevirtual #38; //Method java/util/HashMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
52: if_acmpne 67
55: new #39; //class reu/exceptions/REUException
58: dup
59: bipush 58
61: bipush 17
63: invokespecial #40; //Method reu/exceptions/REUException."<init>":(II)V
66: athrow
67: getstatic #37; //Field AlmacenFechaCal:Ljava/util/HashMap;
70: aload_1
71: invokevirtual #38; //Method java/util/HashMap.get:(Ljava/lang/Object;)Ljava/lang/Object;
74: checkcast #41; //class reu/modulos/AlmancenFechas
77: astore_3
78: aload_3
79: invokevirtual #42; //Method reu/modulos/AlmancenFechas.getFechaIni:()I
82: istore 4
84: invokestatic #43; //Method java/util/Calendar.getInstance:()Ljava/util/Calendar;
87: astore 5
89: aload 5
91: aload_0
92: invokevirtual #44; //Method java/util/Calendar.setTime:(Ljava/util/Date;)V
95: aload 5
97: iconst_1
98: invokevirtual #45; //Method java/util/Calendar.get:(I)I
101: istore 6
103: iload 4
105: iload 6
107: if_icmple 112
110: iconst_0
111: istore_2
112: iload_2
113: ireturn
Exception table:
from to target type
14 34 37 any
37 41 37 any
Exceptions:
throws reu.exceptions.REUException
我猜线索在第113行的
ireturn
表达式中。根据Oracle关于ireturn
的文档,它返回一个int。在这个原始类型强制转换中,看起来像是从int到boolean的转换,与C/C++不同,是不允许的。
那怎么可能呢?有隐式转换吗?
谢谢。