day20/SequenceInputStream.java

import java.util.*;import java.io.*;class SequenceInputStream{public static void main(String[] args) throws IOException{/*Vector<FileInputStream> v = new Vector<FileInputStream>();v.add(new FileInputStream("1.txt"));v.add(new FileInputStream("2.txt"));v.add(new FileInputStream("3.txt"));Enumeration<FileInputStream> en = v.elements();SequenceInputStream sis = new SequenceInputStream(en);*/InputStream f1 = new FileInputStream("1.txt");InputStream f2 = new FileInputStream("2.txt");SequenceInputStream sis = new SequenceInputStream(f1,f2);FileOutputStream fos = new FileOutputStream("4.txt");byte[] buf = new byte[1024];int len=0;while((len=sis.read(buf))!=-1){fos.write(buf,0,len);}fos.close();sis.close();}}