Question

我有这样的事情：

InputStream in = new InputStream(fileName);
Scanner sc = new Scanner(in);
String nextWord;
String anotherWord;

while(sc.hasNext()) {
  nextWord = sc.next();
  ...
  ...
}

while(sc.hasNext()) {
anotherWord = sc.next();
...
...
}

第二个循环不起作用，因为在sc.next()读取令牌后扫描程序的缓冲区被清除。如何在不清除扫描仪缓冲区的情况下读取令牌，以便在第二个循环中使用sc？

Answer 1

您可以像这样重新初始化扫描仪。

InputStream in = new InputStream(fileName);
Scanner sc = new Scanner(in);
String nextWord;
String anotherWord;

while(sc.hasNext()) {
  nextWord = sc.next();
  ...
  ...
}
sc = new Scanner(in);
while(sc.hasNext()) {
    anotherWord = sc.next();
    ...
    ...
}

Answer 2

 nextWord = sc.next();
 nextToNextWord = sc.next();
 nextToNextToNext = sc.next();

 anotherWord = sc.next();
 anotherOneWord= sc.next()
 anotherTwoWord = sc.next()

这里不需要循环读取，除非进入数组或Collection。

如何在Java中清除扫描程序缓冲区？

2 个答案: