使用Buffered Reader查找单词

Question

我正在解析一个具有以下文本和相同格式的文件，

name:_____ gender:_____

age:_____ grade:______

在解析时，我想首先查看"gender: f“或"gender: m”&如果是"gender: f“，那么我将创建一个新的girl对象，并设置她的姓名、年龄和年级。否则，如果是男孩，我会创建一个新的男孩对象，并设置他的名字、年龄和年级。

我的代码现在只适用于一种性别。我不确定如何实现它来搜索另一个性别。

while ((line = br.readLine()) != null) {
    line = line.trim();
    st = new StringTokenizer(line);
    if (line.endsWith("gender: f")) {
        f = new female();
        st.nextToken(); 
        String name = st.nextToken();
        f.setName(name);                    
    } else if (line.startsWith("age:")) {
        st.nextToken();
        String age= st.nextToken();
        f.setAge(age);
        line = br.readLine();
    }       
}

请帮帮我！谢谢。

Answer 1

你不能这样做：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;

public class FileReaderExample
{
        private Person person;

        private Person readFile()
        {
          File file = new File("d:\\text.txt");
          try
          {
            FileReader fileReader = new FileReader(file);
            BufferedReader br = new BufferedReader(fileReader);
            String line;
            while ((line = br.readLine()) != null)
            {
              line = line.trim();
              StringTokenizer st = new StringTokenizer(line);
              if ( line.endsWith("gender: f") )
              {
                person = new Female();
                st.nextToken();
                String name = st.nextToken();
                person.setName(name);
              }
              else if ( line.endsWith("gender: m") )
              {
                person = new Male();
                st.nextToken();
                String name = st.nextToken();
                person.setName(name);
              }
              else if ( line.startsWith("age:") )
              {
                st.nextToken();
                String age = st.nextToken();
                person.setAge(age);
                line = br.readLine();
              }
            }

          }
          catch (IOException io)
          {
            // 
          }

          return person;
        }

      public abstract class Person
      {
        private String name;
        private String age;
        private String grade;

        public String getAge()
        {
          return age;
        }

        public void setAge(String age)
        {
          this.age = age;
        }

        public String getName()
        {
          return name;
        }

        public void setName(String name)
        {
          this.name = name;
        }

        public String getGrade()
        {
          return grade;
        }

        public void setGrade(String grade)
        {
          this.grade = grade;
        }

      }

      public class Female extends Person
      {
         public Female() {}
      }


      public class Male extends Person
      {
         public Male() {}
      }

}

Answer 2

假设你的文件只包含一个人，下面是你可以做的：

while ((line = br.readLine()) != null) {
    line = line.trim();
    st = new StringTokenizer(line);

    if (line.endsWith("gender: f")) {
        person = new Female(); // Your Java classes's name should start with a capital letter (coding convention)
        st.nextToken(); 
        String name = st.nextToken();
        person.setName(name);                    
    } else if (line.endsWith("gender: m")) {
        person = new Male();
        st.nextToken(); 
        String name = st.nextToken();
        person.setName(name);                    
    } else if (line.startsWith("age:")) {
        if(person != null) { // person can be null if the first line of your file is wrong
            st.nextToken();
            String age = st.nextToken();
            person.setAge(age);
        }
        line = br.readLine();
    }       
}