Question

我正在用Java创建一个调度程序。我把所有内容放在一个类中，但现在我想把它拆分成单独的类。这是一个非常小的程序，所以可能没什么好处，但我想让它的概念正确。代码如下。

我在importTeams（）方法的第二个类中遇到错误。我以为只要我导入了这个方法的包，就可以了。显然不是。有什么提示吗？

package fifa.scheduler.fileimport;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;
import fifa.scheduler.output.*;

public class FileRead2 {

    private String rrTeam;

     public List<String> importTeams() {    
            ArrayList<String> teamList = new ArrayList<String>(); 
            BufferedReader br = null; 
            int linecount = 0;  
            String teamcounter;
            try {
                br = new BufferedReader(new FileReader("path")); 
                while (br.readLine() != null){
                    linecount ++;
                }
                br.close();
                br = new BufferedReader(new FileReader("path"));
                setRrTeam(br.readLine());
                while ((teamcounter = br.readLine()) != null) {
                    teamList.add(teamcounter);
                    }
                if (linecount % 2 != 0) {
                    teamList.add("byeteam");
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }           
            return teamList;
     }
        public static void main(String args[]){
            FileRead2 fr = new FileRead2();
            fr.PrintTeams();    
        }
        private void setRrTeam(String rrTeam) {
            this.rrTeam = rrTeam;
        }
        private String getRrTeam() {
            return rrTeam;
        }
}



package fifa.scheduler.output;

import java.util.Collections;
import java.util.List;
import fifa.scheduler.fileimport.FileRead2;

public class SchedulerOutput {
    public void PrintTeams(){

    List<String> teamList = importTeams();
     int tl = teamList.size();
     int bh = 0;
     int uh = (tl - 2);
     for (int i = 0; i <=(teamList.size()-1); i++) {     
     System.out.println("Week " + (i+1) + " fixtures");
     System.out.println(getRrTeam() + " vs " + teamList.get(tl -1));
     while ((bh <= (tl / 2)) && (uh >= ((tl / 2)))) {
         System.out.println(teamList.get(bh) + " vs " + teamList.get(uh));
         bh++;
         uh--;
     }
     Collections.rotate(teamList, 1);
     tl = teamList.size();
     bh = 0;
     uh = (tl - 2);
     }
}
}

Answer 1

使用import语句导入类时，仅导入类的接口。要调用成员方法，您需要该类的实例。

在您的情况下，您应该创建一个FileRead2类型的对象来调用importTeams()方法。

// Since FileRead2 has some member variable, you should also think about
// initializing it appropriately if it is needed by importTeams method.
FileRead2 fileRead2Obj = new FileRead2();
fileRead2Obj.importTeams();

类似地，要调用静态方法，您需要使用类名限定方法名称（尽管Java 5+也允许静态导入方法）。

如果importTeams()是静态方法，那么在导入类后应该按如下方式调用它：

FileRead2.importTeams();

对于SchedulerOutput类型，方法importTeams（）未定义

1 个答案: