Java Scanner.nextInt()在读取整数时引发InputMismatchException
我的代码有一个问题,看起来应该运行得很好Java Scanner.nextInt()在读取整数时引发InputMismatchException,java,inputmismatchexception,Java,Inputmismatchexception,我的代码有一个问题,看起来应该运行得很好 public void inputFile() { Scanner reader = null; try { reader = new Scanner( new File ("parts.dat")); reader.useDelimiter("\\,|\\n"); while(reader.hasNext()) { System.out.println(reader
public void inputFile() {
Scanner reader = null;
try {
reader = new Scanner( new File ("parts.dat"));
reader.useDelimiter("\\,|\\n");
while(reader.hasNext()) {
System.out.println(reader.next());
System.out.println(reader.next());
System.out.println(reader.nextDouble());
System.out.println(reader.nextInt()); //InputMismatchException
}
}
catch(IOException e) {
}
finally {
reader.close();
}
}
当我运行代码时,我得到以下输出:
137B245
1/4" bolt
0.59
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at lab02d.inputFile(lab02d.java:25)
at lab02d.main(lab02d.java:11)
parts.dat包含:
137B245,1/4" bolt,.59,12
137N245,1/4" nut,.29,12
137B246,1/2" bolt,.79,12
137N246,1/2" nut,.39,25
139S128,1/8" wood screw,.19,8
139S129,1/4" wood screw,.22,4
139S130,1/2" wood screw,.35,16
145W321,1/8" washer,.12,5
145W322,1/4" washer,.14,6
145W323,1/2" washer,.18,9
为了让这段代码正常工作,我尝试了几种方法。我尝试过使用Integer.parseInt(reader.next()),但这只会引发另一个异常。我也尝试过更改文本文件编码,但也没有解决任何问题。我相当确定您的文件在这些行的末尾有额外的空白,阻止扫描仪解析看起来合理的整数。例如回车符。请将分隔符调整为如下所示,然后重试:
reader.useDelimiter("[\\,\\n\\r]+");
你能把
e.printStackTrace()
放在catch
块中并发布它吗?