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˵£¬¾ÍÊÇÇ°ºóÁ½´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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package test;
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
public class XmlTest {
public static void main(String[] args) {
File xmlFile=new File("test/xml.xml");
DocumentBuilderFactory documentBuilderFactor ......
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package OALogic.sql.data;
import java.io.*;
public class FileOperate {
public FileOperate() {
}
public static void main(String args[]){
newFolder("D:/100");
}
/**
......