Java Scanner NoSuchElementException
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Scanner scan = new Scanner(System.in);
scan.next();
scan.close();
scan = new Scanner(System.in);
scan.next();
µ±³ÌÐòÔËÐе½µÚÎåÐÐÊÇ»áÅ׳öjava.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:838)
at java.util.Scanner.next(Scanner.java:1347)
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¼òÒªµÄ˵£¬¾ÍÊÇǰºóÁ½´ÎʵÀý»¯µÄ²ÎÊýSystem.inÊÇÓÃÒ»¸ö¶ÔÏó£¬ÊÇInputStreamReader¶ÔÏó£¬Ã¿¸ö¸Ã¶ÔÏó°üº¬Ò»¸ö
StreamDecoder ʵÀý sd
private final StreamDecoder sd;
¶øscan.close()·½·¨Îª
public void close() {
if (closed)
return;
if (source instanceof Closeable) {
try {
((Closeable)source).close();
} catch (IOException ioe) {
lastException = ioe;
}
}
sourceClosed = true;
source = null;
closed = true;
}
µ±Ö´Ðе½ ((Closeable)source).close();¾Í»á½øÈëInputStreamReaderµÄclose()·½·¨£º
public void close() throws IOException {
sd.close();
}
ÕâÀïµÄsd¾ÍÊÇÉÏÃæÌáµ½µÄInputStreamReader¶ÔÏ󣬣¨ÓвéÁËStreamDecoder Ô´´úÂ룬µ«Ã»¸üÉîÈëÏÂÈ¥£©£¬´ËʱsdÒѹرա£
µ±Ö´ÐÐÈç´íÎó²úÉú´úÂëµÄµÚ5ÐдúÂë scan.next()ʱ£¬
public String next() {
ensureOpen();
clearCaches();
while (true) {
String token = getCompleteTokenInBuffer(null);
if (token != null) {
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game
server responsibility:
Initialize
the server socke;
Wait
for a client to connect;
Accept
the client connection;
Create
a daemon thread to support the clien;
Go
back to step 2.
game daemon responsibility:
Accept
client player connection;
Pair
......
import java.util.Scanner;
public class Game{
void welcome(){
println("»¶ÓÀ´µ½¼ôµ¶Ê¯Í·²¼ÓÎÏ·");
}
Choice getUserChoice(){
println("ÇëÑ¡Ôñ\t[1]¼ôµ¶\t[2]ʯͷ\t[3]²¼");
Scanner sc= new Scanner(System.in);
int userCh ......
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