Le Tutoriel de Java SequenceInputStream

final void nextStream() throws IOException  

// Methods inherited from InputStream

public int available() throws IOException  
public int read() throws IOException  
public int read(byte b[], int off, int len) throws IOException  
public int read(byte[] b) throws IOException  
public byte[] readAllBytes() throws IOException  
public byte[] readNBytes(int len) throws IOException  
public int readNBytes(byte[] b, int off, int len) throws IOException  

public long skip(long n) throws IOException

public boolean markSupported()
public synchronized void mark(int readlimit)

public synchronized void reset() throws IOException  
public void close() throws IOException

public long transferTo(OutputStream out) throws IOException

public SequenceInputStream​(InputStream s1, InputStream s2)    

public SequenceInputStream​(Enumeration<? extends InputStream> e)

# Flower names (1)

Tulip
Daffodil
Poppy
Sunflower
Bluebell
Rose
Snowdrop
Cherry blossom

# Flower names (2)

Orchid
Iris
Peony
Chrysanthemum
Geranium
Lily
Lotus
Water lily
Dandelion
Hyacinth
Daisy
Crocus

package org.o7planning.sequenceinputstream.ex;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.SequenceInputStream;

public class SequenceInputStreamEx1 {

    // Windows: C:/Data/test/flowers-1.txt
    private static String file_path1 = "/Volumes/Data/test/flowers-1.txt";
    private static String file_path2 = "/Volumes/Data/test/flowers-2.txt";

    public static void main(String[] args) throws IOException {

        InputStream is1 = new FileInputStream(file_path1);
        InputStream is2 = new FileInputStream(file_path2);
        
        // Create SequenceInputStream:
        InputStream is = new SequenceInputStream(is1, is2);
        
        InputStreamReader isr = new InputStreamReader(is, "UTF-8");
        BufferedReader br = new BufferedReader(isr);
        
        String line;
        while((line = br.readLine())!= null)  {
            System.out.println(line);
        }
        br.close();
    }
}

package org.o7planning.sequenceinputstream.ex;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.SequenceInputStream;

public class SequenceInputStreamEx2 {

    // Windows: C:/Data/test/flowers-1.txt
    private static String file_path1 = "/Volumes/Data/test/flowers-1.txt";
    private static String file_path2 = "/Volumes/Data/test/flowers-2.txt";

    public static void main(String[] args) throws IOException {

        InputStream is1 = new FileInputStream(file_path1);
        InputStream is2 = new FileInputStream(file_path2);
        
        // Create SequenceInputStream:
        InputStream is = new SequenceInputStream(is1, is2);
        
        InputStreamReader isr = new InputStreamReader(is, "UTF-8");
        BufferedReader br = new BufferedReader(isr);
        
        br.lines() // Stream
           .filter(line -> !line.isBlank()) // Not blank
           .filter(line -> !line.startsWith("#")) // Not start with "#"
           .forEach(System.out::println);
        
        br.close();
    }
}