好的,我有一个名为 WeaponList 的类,其中包含类型 <String, Ranged>
的静态 HashMap (Ranged 是另一个类)Ranged 类还扩展了另一个称为 Weapon 的类。
然后我还有另一个类叫做 Scout。侦察兵是武器(记得是远程扩展)和点的组合。我还应该指出,ScoutSquad 类是 Scout 的聚合,具有 get 和 set 方法。
所以在主程序中,当你实例化一个侦察兵对象时,每个侦察兵的默认远程武器是“ bolt 手枪”,默认点数是13。
现在,在 Scout 类中,有一个选项可以通过 rangedUpgrade(Ranged ranged) 方法升级你的远程武器。所以在主程序中使用这行代码:scouts.getScout(5).rangedUpgrade(WeaponList.getRanged("Shotgun"));
成功升级索引 5 处的侦察兵,并显示新武器和侦察兵新点数(因为每个武器都有与其关联的点数)
但是目前侦察兵可以升级到 WeaponList 类 HashMap 中的任何远程武器。我希望侦察兵只能升级到 HashMap 中的某些远程武器。我已经尝试使用 if 语句设置条件,但到目前为止没有成功。 (Scout 类第 27 - 35 行)
我将提供所有相关类的代码,并希望有人可以提供帮助。
谢谢。
武器列表类
package armoury1;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import troops.scouts.Scout;
public class WeaponList
{
static Map<String, Ranged> rangedlist = new HashMap<String, Ranged>()
{{
put("Bolter", new Ranged2H("Bolter", 1));
put("Bolt Pistol", new Ranged("Bolt Pistol", 1));
put("Flamer", new Ranged2H("Flamer", 1));
put("Meltagun", new Ranged2H("Meltagun", 1));
put("Plasma Gun", new Ranged2H("Plasma Gun", 1));
put("Plasma Pistol", new Ranged("Plasma Pistol", 10));
put("Shotgun", new Ranged2H("Shotgun", 10));
put("Sniper Rifle", new Ranged2H("Sniper Rifle", 5));
put("Assault Cannon", new Ranged2H("Assault Cannon", 10));
put("Cyclone Missle Launcher", new Ranged2H("Cyclone Missle Launcher", 10));
put("Heavy Bolter", new Ranged2H("Heavy Bolter", 10));
put("Heavy Flamer", new Ranged2H("Heavy Flamer", 10));
put("Assault Cannon", new Ranged2H("Lascannon", 10));
put("Missle Launcher", new Ranged2H("Missle Launcher", 10));
put("Multi Melta", new Ranged2H("Multi Melta", 10));
put("Plasma Cannon", new Ranged2H("Plasma Cannon", 10));
}};
public static Ranged getRanged(String index)
{
return rangedlist.get(index);
}
public static Map<String, Ranged> getRangedList()
{
return rangedlist;
}
}
侦察类
package troops.scouts;
import armoury.Wargear;
import armoury1.Melee;
import armoury1.Ranged;
import armoury1.Weapon;
import armoury1.WeaponList;
public class Scout
{
private Weapon ranged, melee;
private int points;
//DEFAULT SCOUT
public Scout()
{
ranged = new Ranged("Bolt Pistol", 0);
melee = new Melee("Close Combat Weapon", 0);
points = 13;
points = points + ranged.getWeaponPoints() + melee.getWeaponPoints();
}
public void rangedUpgrade(Ranged ranged)
{
if (ranged.equals(WeaponList.getRanged("Shotgun")));
{
this.ranged = ranged;
points = points + ranged.getWeaponPoints();
}
else
System.out.println("Can not have this weapon");
}
public void meleeUpgrade(Melee melee)
{
this.melee = melee;
points = points + melee.getWeaponPoints();
}
public Weapon getRangedUpgrade()
{
return ranged;
}
public Weapon getMeleeUpgrade()
{
return melee;
}
@Override
public String toString()
{
return "|| " + "Ranged Weapon: " + ranged + " || " + "Melee Weapon: " + melee + " || " + "Points: " + points;
}
}
主程序
package main;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import armoury1.Melee;
import armoury1.Ranged;
import armoury1.Weapon;
import armoury1.WeaponList;
import troops.scouts.Scout;
import troops.scouts.ScoutSergeant;
import troops.scouts.ScoutSquad;
public class ArmyBuilderDemo
{
public static void main(String[] args) throws Exception
{
ScoutSquad scouts = new ScoutSquad("Squad 1");
Scanner input = new Scanner(System.in);
System.out.println("Enter the squad size: ");
int size = input.nextInt();
for (int i = 0; i < size; i++)
scouts.addScout(new Scout());
System.out.println(scouts.getScoutSquad());
scouts.getScout(5).rangedUpgrade(WeaponList.getRanged("Shotgun"));
scouts.getScout(5).meleeUpgrade(WeaponList.getMelee(3));
System.out.println(scouts.getScoutSquad());
input.close();
}
}
远程类别(扩展武器)
package armoury1;
import java.util.ArrayList;
import java.util.List;
import troops.scouts.Scout;
public class Ranged extends Weapon
{
public Ranged(String name, int points)
{
super(name, points);
}
}
最佳答案
请在 Ranged 类中实现 .equals()
方法。
此外,您在 rangedUpgrade(Ranged ranged)
中放置的 if 条件在同一行终止。
请将该方法的代码修改为:
public void rangedUpgrade(Ranged ranged) {
if (ranged.equals(WeaponList.getRanged("Shotgun"))){
this.ranged = ranged;
points = points + ranged.getWeaponPoints();
} else
System.out.println("Can not have this weapon");
}
}
关于Java - 为类方法编写一个条件,确保只能使用 HashMap 的某些项目。,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44266701/