标准输入读多行

Question

I have the following code:

        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String submittedString = "";
        System.out.flush();
        submittedString = stdin.readLine();

        int numberofLines = Integer.parseInt(submittedString.split(" ")[0]);

        for(int i = 0; i < numberofLines; i++)
            submittedString += stdin.readLine();

        zipfpuzzle mySolver = new zipfpuzzle();
        mySolver.getTopSongs(submittedString);

However, despite the input being over multiple lines, this only reads the first.

Where is my mistake?

If it makes any difference, I am compiling on eclipse.

Cheers! Dario

Answer 1

Just use an array and populate it within your for-loop:

String[] inputs = new String[numberofLines];

for (int i = 0; i < numberofLines; i++)
    inputs[i] = stdin.readLine();

Extra Note:

If you want multiple lines with single String:

String submittedString = "";

for (int i = 0; i < numberofLines; i++)
    submittedString += stdin.readLine() + System.getProperty("line.separator");

Answer 2

BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
String line = "";

while ((line = stdin.readLine()) != null){
// Do something.
submittedString += line + '\n';

}

Answer 3

submittedString = stdin.readLine();

BufferedReaders readLine method will read System.in until it hits a new line, therefore if you're using the first line of the file to determine the number of lines to read then your data must be incorrect.