Java中的printWriter

Question

I have a question regarding to printWriter, please see code below:

PrintWriter out = new PrintWriter(System.out);
Scanner n = new Scanner(System.in);

while (n.hasNext()) {
    String str = n.next();
    if (str.equals("m")) {
        break;
    } else {
        out.printf("%s", str);
        out.print(" ");
    }   
}
n.close();
// out.close();
System.out.println("input is successful");

When I input something by keyboard, it output on screen what i input, but it did not process the rest of the program, which meant it did not print "input is successful", however, when I delete the command of out.close(); it kept running the rest program, so I want to ask what does out.close() mean? I thought it just means to stop writing for output, I guess it has something to do with the parameter I put in the new PrintWriter(...)

Answer 1

PrintWriter.close() will also close the underlying stream, ie System.out . This effectively means that any subsequent outputs to System.out will be ignored.