Java 数字格式问题，新手项目

我正在尝试编写一个程序，加载一个电影数据库文件，然后将这些信息拆分为电影标题、年份和所有相关演员。我拆分了所有信息，但在将字符串中的年份转换为整数时遇到问题。年份字符串的格式为（****），其中*为年份，例如1999年。当我尝试使用parse时，我得到一个数字格式异常。我尝试过替换括号，但它只是给了我更多的错误！有什么想法吗

public class MovieDatabase {

ArrayList<Movie> allMovie = new ArrayList<Movie>();

//Loading the text file and breaking it apart into sections
public void loadDataFromFile( String aFileName) throws FileNotFoundException{
    Scanner theScanner = new Scanner(aFileName);
    theScanner = new Scanner(new FileInputStream("cast-mpaa.txt"));

    while(theScanner.hasNextLine()){
        String line = theScanner.nextLine();
        String[] splitting = line.split("/" );
        String movieTitleAndYear = splitting[0];
        int movieYearIndex = movieTitleAndYear.indexOf("(");
        String movieYear = movieTitleAndYear.substring(movieYearIndex);
        System.out.println(movieYear);
        //this is where I have issues
        int theYear = Integer.parseInt(movieYear);
        String movieTitle = movieTitleAndYear.substring(0, movieYearIndex);
        ArrayList<Actor> allActors = new ArrayList<Actor>();
        for ( int i = 1; i < splitting.length; i++){
            String[] names = splitting[i].split(",");
            String firstName = names[0];
            Actor theActor = new Actor(firstName);
            ArrayList<Actor> allActor = new ArrayList<Actor>();
            allActor.add(theActor);
        }

        Movie theMovie = new Movie(movieTitle, theYear, allActors);
        allMovie.add(theMovie);

    }       
    theScanner.close();
}

以下是我得到的错误：

Exception in thread "main" java.lang.NumberFormatException: For input string: "(1967)"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:481)
at java.lang.Integer.parseInt(Integer.java:527)
at MovieDatabase.loadDataFromFile(MovieDatabase.java:27)

---

数字周围有括号。您可以更正文件，也可以使用以下方法删除括号：

String str = "(1967)";
System.out.println(str.substring(1, str.length()-1));
Output:
1967

在代码中，您使用了：

int movieYearIndex = movieTitleAndYear.indexOf("(");
String movieYear = movieTitleAndYear.substring(movieYearIndex);

所以，如果我的movieTitleAndYear字符串是“hi（1947）”，indexOf将给我索引“（”as 3），子字符串将从索引3开始读取字符串，其中包括“（”。避免打开括号的一种方法是将子字符串行更改为：

String movieYear = movieTitleAndYear.substring(movieYearIndex + 1);//but still you have closing bracket.

如果您确定它始终是四位数，那么您可以执行以下操作：

String movieYear = movieTitleAndYear.substring(movieYearIndex + 1, movieYearIndex  + 5);

---

您的

子字符串

调用当前会得到一个用括号括起来的年份，例如，

（1967）

。您可以通过调用来避免这种情况，只需得到年份的四位数字：

String movieYear = 
    movieTitleAndYear.substring(movieYearIndex + 1, // to get rid of "("
                                movieYearIndex + 5 // to get rid of ")" 
                               );

---

您需要为“）”添加indexof。 代码段：

int movieYearOpenBracesIndex = movieTitleAndYear.indexOf("(");
int movieYearCloseBracesIndex = movieTitleAndYear.indexOf(")");
String movieYear = movieTitleAndYear.substring(movieYearOpenBracesIndex + 1, movieYearCloseBracesIndex);
System.out.println(movieYear);

---

这将给出确切的年份。例如，1967年。请添加stacktrace。并从文件中提取样本数据。在将其解析为

int

之前打印

movieYear

，并打印

movieYear

的值。与jbniset达成一致，打印movieYear将显示您的问题。最可能的问题是子字符串的结尾。在子字符串中（movieYearIndex）；您只提到年初字符串，而没有提到年末字符串索引。如果年份像（xxxx），行字符串movieYear=movieTitleAndYear.substring（movieYearIndex）；是错误的，因为它将返回类似xxxx的字符串）您缺少两个参数之间的昏迷：）@AlexandreLavoie多么尴尬：-）谢谢！（固定）

int movieYearOpenBracesIndex = movieTitleAndYear.indexOf("(");
int movieYearCloseBracesIndex = movieTitleAndYear.indexOf(")");
String movieYear = movieTitleAndYear.substring(movieYearOpenBracesIndex + 1, movieYearCloseBracesIndex);
System.out.println(movieYear);