Question

我有一个文本文件，在该文件中，我尝试使用不同的方法来分隔文件中的特定内容，并根据要打印的方法进行打印。在这种情况下，我使用不同的方法来区分人们所居住的国家（即john mexico或william cuba。我做了两个不同的类（主类和超级类）。

这是超类

import java.util.*;

public class myHashSet{


public static HashSet <String> Mexico = new HashSet<>();
public static HashSet <String> Cuba = new HashSet<>();
public static HashSet <String> Jamaica = new HashSet<>();


//only mexico
public void Mexico(){
    Mexico.removeAll(Cuba);
    Mexico.removeAll(Jamaica);

    Iterator <String> m = Mexico.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }

}

//only cuba
public void Cuba(){
    Cuba.removeAll(Mexico);
    Cuba.removeAll(Jamaica);

    Iterator <String> m = Cuba.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }
}

//only jamaica
public void Jamaica(){
    Jamaica.removeAll(Mexico);
    Jamaica.removeAll(Cuba);

    Iterator <String> m = Jamaica.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }
}

//person from every country
public void orCountries(){
    Jamaica.addAll(Mexico);
    Jamaica.addAll(Cuba);

    Iterator <String> m = Jamaica.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }
}

//people who have been to all countries
public void allCountries(){
    Jamaica.retainAll(Mexico);
    Jamaica.retainAll(Cuba);

    Iterator <String> m = Jamaica.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }
}

//only mexico and cuba
public void MexicoandCuba(){
    Mexico.addAll(Cuba);
    Cuba.removeAll(Jamaica);

    Iterator <String> m = Mexico.iterator();
    while(m.hasNext()){
        System.out.println(m.next());
    }
}
}

然后这是我的主类，应该使用超类的方法：

import java.io.*;
import java.util.Scanner;

public class people extends myHashSet{

public people(String string) throws FileNotFoundException {
    Scanner input = new Scanner(new File("people.txt"));    
    read(input);
}

public void read(Scanner input){
    while(input.hasNext()){
        String name = input.next();
        String country = input.next();
        System.out.println(name + " " + country);

    }
}

public static void main(String[] args) throws FileNotFoundException {
        people p = new people("people.txt");
        p.Mexico();
        p.Cuba();
        p.Jamaica();
        p.orCountries();
        p.allCountries();
        p.MexicoandCuba();
    }
}

我知道问题在于myHashSet中的方法未读取文件，这就是我对处理方法感到困惑的原因。任何帮助将不胜感激！

用单独的方法读取txt文件

0 个答案: