Question

How to convert this Objective C code in Java ?

NSMutableString * thisPart = [[NSMutableString alloc] init];
UInt64 intVal = (UInt64)[thisPart longLongValue];
if (!intVal) { isBad = YES; break; }

I’ve been searching over the internet but didn’t find any useful information over the internet.

If I had :

UInt32 _tmpPacket_packetId;
_tmpPacket_packetId = (UInt32)intVal;  // UInt64 intVal = (UInt64)[thisPart longLongValue];

Can I do this :

BigInteger tmpPacket_packetId = intVal;

Actually the right question is : Is it right to do that to get the same thing as done in Objective C?

Answer 1

I’m going to assume that you don’t care about the NSMutableString bit which would probably similar to the StringBuilder/StringBuffer classes. A UInt64 would appear to be a 64bit unsigned int? Then you could use the String constructor provided by BigInteger(String)

StringBuilder thisPart = new StringBuilder("12345678901234567890");
try {
    BigInteger intVal = new BigInteger(thisPart.toString());
} catch (NumberFormatException e) {
    System.out.println("Bad value");
    isBad = true;
    break; // or return or what have you
}