Question

使用Java，我使用扫描仪读取输入文件，我能够读取和打印输入文件。但我现在很难解析它。

示例输入文件如下：

height 6

weight 120

name john

team played for team1 start 2010 end 2012

team played for team1 start 2010 end 2012

team played for team2 start 2013 end 2015

我该如何解析这些信息。目前我正在按行扫描输入，如：

while (scanner.hasNext()) {
    String line = scanner.nextLine();
    System.out.println(line);
}

我会做类似的事吗

int height = height.nextInt();
int weight = weight.nextInt();
String name = name.nextLine();

现在我坚持使用最后3行，假设前3行被正确解析

Answer 1

正如@pshemo所说，我错过了添加line = line.replace（..）

int height = 0;
int weight = 0;
String name = "";

while (scanner.hasNextLine())   // use hasNextLine()  
{

 String line = scanner.nextLine();

 if(line.startWith("height "))  // do the same for weight 
 {
    line = line.replace("height ", "");
    try
    {
      height = Integer.parseInt(line);
    }
    catch(NumberFormatException e1)
    {

    }
 }

 else if(line.startWith("weight "))  // do the same for weight 
 {
   line = line.replace("weight ", "");
   try
   {
     weight = Integer.parseInt(line);
   }
   catch(NumberFormatException e1)
   {

   }
 }

 else if(line.startsWith("name "))
 {
   line = line.replace("name ", "");
   name = line;
 }

 else if(line.startsWith("team played for "))
 {
   line = line.replace("team played for ", "");

   String teamName = "";
   int i = 0;
   while(line.charAt(i) != ' ')
   {
      teamName = teamName + line.charAt(i); // copying the team name till space
      i++;
   }
   line = line.replace(teamName+" ","");
   // now we will be left with a string that contains start year 1 end year 2

   line = line.replace("start ", "");

   i = 0; // using the same i variable

   String startYear = "";

   while(line.charAt(i) != ' ')
   {
      startYear = startYear+ line.charAt(i);
      i++
   }
   line = line.replace(startYear+" end ", "");

   String endYear = line;
    // just make this as global variables if u need to use them in a different method also if you need to parse string to integer use  Interger.parseInt(String)

  }

  System.out.println("Name :-" + name);
  System.out.println("Weight :-" + weight);
  System.out.println("Height :-" + height);

}

// by now all the data has been stored to their respective variables

Answer 2

我认为这个解决方案更优雅一点。

顺便说一句，我真的不知道你想对这些信息做什么，所以我就把它留下来了。您可以创建一个对象或只将其打印到控制台：

while (scanner.hasNext()) {

        scanner.next(); // skip "height"
        int height = scanner.nextInt(); // get height
        scanner.next(); // skip "weight"
        int weight = scanner.nextInt(); // get weight
        scanner.next(); // skip "name"
        String name = scanner.next(); // get name

        while (scanner.hasNext("team")) {
            // parse the "team info" similarly, as shown above.
            // make sure that you parse it correctly, so that
            // in the next inner while loop, the scanner.hasNext("team")
            // will be positioned just before the next line of "team"
            // or a next line that containes a new record.
        }


    }

我需要帮助解析我的输入文件，我应该使用arraylist吗？

2 个答案: