I came across this program and its not behaving in expected way.
public class StringTest
{
public static void main(String[] args)
{
String s = "Hello world";
for(int i = 0 ; i < s.length() ; i++)
{
System.out.write(s.charAt(i));
}
}
}
If we think it should print Hello world but it prints nothing. What is going on? Any ideas? Thanks in advance.
You want: System.out.print(s.charAt(i));
As per the API of write:
Note that the byte is written as given; to write a character that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.
As noted in a comment to your question, if you really wish to use write() you need to flush().
The reason why write(int) doesn't print anything is because it only flushes the stream on \n and when autoFlush is true.
public void write(int b) {
try {
synchronized (this) {
ensureOpen();
out.write(b);
if ((b == '\n') && autoFlush)
out.flush();
}
}
catch (InterruptedIOException x) {
Thread.currentThread().interrupt();
}
catch (IOException x) {
trouble = true;
}
}
print methods call a particular write method that flushes streams. The other write methods (except for the one called by each print print) don't flush the streams. The one the asker used would not auto-flush.
flush().