Consolidated stream of Java 21-13 IO streams

: Represents the logical concatenation of other input streams SequenceInputStream .

Construction Method Summary
Sequenceinputstream (enumeration <? Extends Inputstream> e)            Initializes the newly created Sequenceinputstream by remembering the parameters, which must be a enumeration for the build Run-time type InputStream object The type Parameter.
Sequenceinputstream (inputstream  s1, inputstream s2)            Initialize the newly created Sequenceinputstream by remembering these two parameters, read the s1 first, and then read S2 to provide a The bytes read by Sequenceinputstream .

The second construction method is shown first:

Sequenceinputstream (inputstream s1, InputStream s2)

Requirements: Copy the contents of 2 files to another 1 files
Previous Actions:
A.txt--b.txt
C.txt--d.txt
Now you want to:
A.txt+b.txt--c.txt

1  public Static voidMain (string[] Args)throwsIOException {2         //merge Datastreamdemo.java and user.txt into Copy.txt3         4         //first, 2 files are encapsulated, because the Sequenceinputstream (inputstream s1, inputstream s2) required parameter list is the InputStream class5         //Fileinputstrem is a subclass of inputstream, using Polymorphism:6InputStream in1 =NewFileInputStream ("datastreamdemo.java");7InputStream in2 =NewFileInputStream ("user.txt");8         //put these two files into the Sequenceinputstream.9Sequenceinputstream in =Newsequenceinputstream (in1, in2);Ten          one         //Package Destination aBufferedoutputstream bw =NewBufferedoutputstream (NewFileOutputStream ("Copy.txt")); -         //reads in1 and in2 data and writes in -         byte[] by =New byte[1024]; the         intLen = 0; -              while(len = In.read (by))! =-1){ -Bw.write (by,0, len); -             }     + in1.close (); - in2.close (); + bw.close (); a in.close (); at          -}

3, demonstrate the first method of Construction:

Sequenceinputstream (enumeration E)
Through a simple review, we know that enumeration is the return value type of a method in a Vector.
Enumeration<e> Elements ()

Requirements: copy data from 3 files to a different file
Previous Actions:
A.txt--b.txt
C.txt--d.txt
E.txt--f.txt
Now you want to:
A.txt+b.txt+c.txt--d.txt

1      public Static voidMain (string[] Args)throwsIOException {2         //Sequenceinputstream (enumeration E) needed is enumeration3         //and enumeration is the return value type of a method in a Vector. enumeration<e> Elements ()4         //so it's going to be the way. 5 6         //first, Define a vector object7Vector<inputstream> v =NewVector<inputstream>();8InputStream I1 =NewFileInputStream ("pw.txt");9InputStream i2 =NewFileInputStream ("user.txt");TenInputStream i3 =NewFileInputStream ("datastreamdemo.java"); one          a         //add these three files to a vector - V.add (i1); - V.add (i2); the V.add (i3); -         //This method of achieving vector, get enumeration -Enumeration<inputstream> e =v.elements (); -         //the following method can be used later, so that the data in the 3 files is stored in the SI +Sequenceinputstream si =NewSequenceinputstream (e); -          +         //Create an input stream aBufferedoutputstream bo =NewBufferedoutputstream (NewFileOutputStream ("Copy.txt")); at          -         //read the Vertor data and add it to the Copy.txt -         byte[] by =New byte[1024]; -         intLen = 0; -          while(len = Si.read (by))! =-1){ -Bo.write (by,0, len); in         } - si.close (); to bo.close (); +}

Consolidated stream of Java 21-13 IO streams