I code in c++ ever from the start but now have been working on project related to Network Administration on Java. Here a[i].addresses returns a NetworkInterfaceAddress[] (i.e., an array). But when I try to copy like this, it gives an error.
NetworkInterface[] a;
a=JpcapCaptor.getDeviceList();
NetworkInterfaceAddress[] b=new NetworkInterfaceAddress[a.length];
int i=-1;
while(++i<a.length)
b[i]=a[i].addresses;
This gives an error:
incompatible types: NetworkInterfaceAddress[] cannot be converted to NetworkInterfaceAddress.
The array b is a NetworkInterfaceAddress array, meaning that it can store objects of type NetworkInterfaceAddress. However, as you said, a[i].addresses returns an array of NetworkInterfaceAddress So, b should be capable of storing arrays of type NetworkInterfaceAddress instead of objects of type NetworkInterfaceAddress. For that, b should be an array of arrays or a jagged array. Change b's definition to
NetworkInterfaceAddress[][] b = new NetworkInterfaceAddress[a.length][];
Then, while adding a[i].addresses in the array, assign the length of the current array inside b, that has to hold a[i].addresses, to a[i].length.
while(++i<a.length){
b[i] = new NetworkInterfaceAddress[a[i].addresses.length];
b[i] = a[i].addresses; //b[i] is an array itself
}