从文本文件中获取格式化数字的简单方法？

Question

所以我知道在C++中我可以做到这一点：

ifstream file("data/maps/ssdebug1.cfg"); 
    string line; 
float startx = 0; 
    sscanf (line.c_str(), "start-x = %f;", &startx); 

但有一个同样简单的方法在Java中做到这一点？

Answer 1

在Java中，你可以从Java 1.5版做

FileInputStream fis = new FileInputStream("data/maps/ssdebug1.cfg"); 
Properties prop = new Properties(); 
prop.load(fis); 
fis.close(); 

// you can have any number of properties with comments. 
// However, it is not assumed aline ends with a ';' 
String start_x = prop.getProperty("start-x"); 
double startx = Double.parseDouble(start_x); 

Answer 2

可以使用java.util.Scanner中也..
http://download.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html

例子：

Scanner in = new Scanner(new File("data/maps/ssdebug1.cfg")); 
     while (in.hasNextLong()) { 
      long my = in.nextLong(); 
     }