new line for every new stream in SequenceInputStream

Question

I have two files, test-1.text (content is Data from test-1) and test-2.text (content is Data from test-2).
when I use SequenceInputStream to read from two streams, output comes either in one straight line like Data from test-1Data from test-2 or every character is on new line.
How can I start to print content from the second stream in a new line?

public class SequenceIStream {

public static void main(String[] args) throws IOException {
    FileInputStream fi1 = new FileInputStream("resources/test-1.text");
    FileInputStream fi2 = new FileInputStream("resources/test-2.text");

    SequenceInputStream seq = new SequenceInputStream(fi1, fi2);

    int i= 0;

    while((i = seq.read())!=-1)
        System.out.print((char)i);
}

}

Output is
Data from test-1Data from test-2

Desired output
Data from test-1
Data from test-2

Tim Biegeleisen · Accepted Answer · 2017-07-21T14:48:13.323

5

I based this response on this helpful SO answer which provides a method for creating a SequenceInputStream from a collection of streams. The basic idea here is that you already have two streams which give the output you want. You only need a line break, more specifically a stream which generates a line break. We can simply create a ByteArrayInputStream from the bytes of a newline string, and then sandwich it in between the file streams you already have.

FileInputStream fi1 = new FileInputStream("resources/test-1.text");
FileInputStream fi2 = new FileInputStream("resources/test-2.text");

String newLine = "\n";
List<InputStream> streams = Arrays.asList(
    fi1,
    new ByteArrayInputStream(newLine.getBytes()),
    fi2);
InputStream seq = new SequenceInputStream(Collections.enumeration(streams));

int i= 0;

while((i = seq.read())!=-1)
    System.out.print((char)i);

edited Jul 21 '17 at 14:48

answered Jul 21 '17 at 14:44

Tim Biegeleisen

502,043
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The List and Collections.enumeration seems unnecessary for the purpose of this example, but I like the overall solution. – aglassman Jul 21 '17 at 14:47
@aglassman Yes it does seem unnecessary. In practice I'd probably just edit the file :-) – Tim Biegeleisen Jul 21 '17 at 14:48
without List and collection, `SequenceInputStream` object can not be created with more than 2 `InputStream` objects. – user252514 Jul 21 '17 at 16:07

score 1 · Answer 2 · answered Jul 21 '17 at 14:44

1

SequenceInputStream doesn't support this option. The only way to fix that ist to add a newline ('\n') character to the content of the file test-1.text (content: Data from test-1\n)

answered Jul 21 '17 at 14:44

J.Profi

76
4

Yup, otherwise you're defeating the purpose of SequenceInputStream. – aglassman Jul 21 '17 at 14:44

new line for every new stream in SequenceInputStream

2 Answers2