Sequenceinputstream (sequential input stream) Example

/* The sequenceinputstream class allows multiple inputstream streams to be connected. The construction of sequenceinputstream is different from any other inputstream. The sequenceinputstream constructor either uses a pair of inputstream or an enumeration of inputstream. The output is as follows: sequenceinputstream (inputstream first, inputstream second) sequenceinputstream (enumeration streamenum, this class meets the read requirements for reading the first inputstream and then forwarding the second stream. When enumeration is used, it continues to read all inputstream streams until the last one is read. Text.txtand file2.txt must be in the current directory. * /// Demonstrate squenced input.
Import java. Io .*;
Import java. util .*;
Class inputstreamenumerator implements enumeration {
Private enumeration files;
Public inputstreamenumerator (vector files ){
This. Files = files. Elements ();
}
Public Boolean hasmoreelements (){
Return files. hasmoreelements ();
}
Public object nextelement (){
Try {
Return new fileinputstream (files. nextelement (). tostring ());
} Catch (exception e ){
Return NULL;
}
}
}
Class sequenceinputstreamdemo {
Public static void main (string [] ARGs) throws exception {
Int C;
Vector files = new vector ();
Files. addelement ("text.txt ");
Files. addelement ("file2.txt ");
Inputstreamenumerator E = new inputstreamenumerator (files );
Inputstream input = new sequenceinputstream (E );
While (C = input. Read ())! =-1 ){
System. Out. Print (char) C );
}
Input. Close ();
}
}