CODEWITHSUNDEEP
javajava-8fileoutputstream
Sorapalli Venkatesh
Sorapalli Venkatesh

Reputation: 59

storing output of one file in another file using java

Here in this code some operations are done with using one file (new.txt) I want to store the output of below code in another file....

public static void main(String a[]) throws Exception {
    try {
        Arrays.stream(Files.lines(Paths.get("new.txt")).collect(Collectors.joining())
                .replaceAll("^.*?1002|1003(.(?!1002))*$", "\n") // trim leading/trailing non-data
                .split("1003.*?1002")) // split on end-to-start-of-next
                .forEach(System.out::println);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Upvotes: 3

Views: 198

Answers (3)

Joop Eggen
Joop Eggen

Reputation: 109567

As you already kept the entire file contents in memory, a non-stream solution is more straight-forward.

String txt = new String(Files.readAllBytes(Paths.get("in.txt")), StandardCharsets.UTF_8);
txt = txt.replaceAll(...);
txt = txt.replaceAll(...); // split behavior
Files.write(Paths.get("out.txt"), txt.getBytes(StandardCharsets.UTF_8));

Added: Though the logic escapes me, the replacements probably should be:

finale String EOL = "\n";
txt = txt.replaceAll("^.*?1002|1003(.(?!1002))*$", EOL ) // trim leading/trailing non-data
txt = txt.replaceAll("1003.*?1002", EOL ) // split on end-to-start-of-next

Upvotes: 3

Gui13
Gui13

Reputation: 13551

You could try that:

public static void main(String a[]) throws Exception
{
    try {
        PrintWriter os = new PrintWriter("output.txt");
        Arrays.stream(Files.lines(Paths.get("new.txt")).collect(Collectors.joining())
            .replaceAll("^.*?1002|1003(.(?!1002))*$", "\n") // trim leading/trailing non-data
            .split("1003.*?1002"))                        // split on end-to-start-of-next
            .forEachOrdered(os::println);
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

Upvotes: 2

sidd607
sidd607

Reputation: 1409

No sure what exactly are you looking for. Here is one way of doing it and what I would do.
You can do this directly from the terminal

javac myFile.java
java ClassName > myfile.txt

This would save your output into a file 'myfile.txt'

Upvotes: 0

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