小编who*_*med的帖子

import java.util.HashMap;
import java.io.*;
import java.util.*;
public class Fegan implements Comparable{
HashMap<String, Integer> cart = new HashMap<String, Integer>();
List list = new ArrayList<FoodItems>();
int x =0;
public void addToCart(FoodItems f)
{
    cart.put(f.name, f.valueOfFood);
}
public String display(FoodItems f)
{
    return(f.name + " costs " + f.valueOfFood);
}
public void addToList(FoodItems f)
{
    //FoodItems temp = (FoodItems) f;
    list.add(f);
}
public int compareTo(Object o)
{
    //FoodItems temp = (FoodItems) o;
    if(this.x == ((FoodItems)o).valueOfFood)
        return 0;
    else if (this.x <((FoodItems)o).valueOfFood)
        return 1; …

我有一个测试文件,根据它,我需要构建我的程序,测试文件在下面.但是,我对s1.showDetails(System.out)感到困惑; 我从来没有遇到参数System.out任何人都可以帮助.怎么办呢??? 当我尝试编写showDetails()时,编译器会写错误.我的学生代码在此之下谢谢你提前!

import java.util.*;
public class Q2 {
    public static void main(String [] args)
    {
        // Start on section A
        System.out.println("Question 2");
        System.out.println("Start on part A");
        Student s1 = new Student("John", "Smith", 42);
        s1.showDetails(System.out);
        Course cs = new Course("Computer science");
    }
}

public class Student {
    private String name;
    private String familyName;
    private int moduleMark;
    private int total;
    protected Student(String name, String familyName, int moduleMark)
    {
        this.name = name;
        this.familyName = familyName;
        this.moduleMark = moduleMark;
    }

    public String getName() …

import java.util.*;

public class Test {
    public static void main(String[] args) {

        List db = new ArrayList();

        ShopDatabase sb = new ShopDatabase(db);
        sb.addEntry(new ProductEntry("film", 30, 400));
        sb.addEntry(new CashierEntry("Kate", "Smith", 23, 600));
        sb.addEntry(new ManagerEntry("Jack", "Simpson", 1, 700));
        sb.addEntry(new ProductEntry("soap", 18, 3));
        sb.addEntry(new ManagerEntry("Helen", "Jones", 60, 650));
        sb.addEntry(new CashierEntry("Jane", "Tomson", 15, 900));
        sb.addEntry(new ProductEntry("shampoo", 25, 5));
        sb.addEntry(new CashierEntry("Bill", "Black", 59, 300));
        Collections.sort(db);
        Iterator itr = db.iterator();

        while (itr.hasNext()) {
            Entry element = (Entry) itr.next();
            System.out.println(element + "\n");
        }
    }
}

public abstract …