Convert C++ to Java

sharathkv · 01-08-2008, 07:10 AM

Hi,

I have a program, which I converted to Java from C++. At least most of it. However I am getting error for 2 statements. Any help would be appreciated;

This is the error I am getting:

Code:

$ javac FirmwareTest.java
FirmwareTest.java:56: operator ! cannot be applied to int
                if ((len != 270) || (s0.charAt(0) != 0x83) || (!(b1 & 0x80) ) ) {
                                                               ^
FirmwareTest.java:80: cannot resolve symbol
symbol  : method subString  (int)
location: class java.lang.String
                        String strRev1 = pHead.subString(3);
                                              ^
2 errors

How to re-write this expression in Java?

Code:

(!(b1 & 0x80) )

b1 is int datatype.

variable "pHead" is "final String pHead;"

Thanks
S

scoban · 01-08-2008, 07:14 AM

~ is the java bitwise NOT operator.
How you initialize pHead, try pHead = new String ("xxx");

sharathkv · 01-08-2008, 07:19 AM

~(tilde) is not working.

Code:

FirmwareTest.java:52: operator || cannot be applied to boolean,int
                if ((len != 270) || (s0.charAt(0) != 0x83) || (~(b1 & 0x80) ) ) {

Any ideas?

Thanks
S

scoban · 01-08-2008, 09:43 AM

No It is working, look error message carefully. What is the value of b1? What are you trying to achieve by ~(b1 & 0x80) Java is expecting a boolean you are giving it an int...

ntubski · 01-08-2008, 04:57 PM

(!(b1 & 0x80) ) translates to ((b1 & 0x80) != 0)

substring not subString

dmail · 01-09-2008, 09:05 AM

Tip:
Unless this is an exercise to learn java (or another number of reasons :} )swig could have saved you time by writing wrappers and calling into your Cpp code.