JavaSpring中的接口类问题

我尝试学习Spring框架。我有一些问题

我创建了一个控制器和几个类。这是控制器：

@Controller
@RequestMapping("/man")
public class manController {
    private SwordImp Sword = new SwordImp();
    private GunImp Gun = new GunImp();
    private String mainWeapon;
    private String subWeapon;
    @RequestMapping(value = "set/{weapon:[a-z A-Z 0-9]+}", method = RequestMethod.GET)
    public String setWeapon(@PathVariable String weapon, Model model){
        System.out.println(weapon);
        if(weapon.equals("gun")){
            Gun.set(weapon);
            mainWeapon = Gun.getWeapon();
            subWeapon = Gun.getSubWeapon();
        }else{
            if(weapon.equals("sword")){
                Sword.set(weapon);
                mainWeapon = Sword.getWeapon();
                subWeapon = Sword.getSubWeapon();
            }else{
                mainWeapon = "no weapon";
                subWeapon = "no sub weapon";
            }
        }
        model.addAttribute("weapon_status", mainWeapon);
        model.addAttribute("sub_weapon_status", subWeapon);
        return "man/index";
    }
}

我还创建了一些类

武器接口

public interface Weapon {
    public void set(String weaponName);
    public String getWeapon();
    public String getSubWeapon();
}

public interface Weapon {
    private String weaponName = null;
    private String bullet = null;
    public void set(String weaponName);
    public String getWeapon();
    public String getSubWeapon();
}

剑类

public class SwordImp implements Weapon {
    private String weaponName = null;   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return "no sub weapon";
    }    
}

public class SwordImp {...}

public class SwordImp implements Weapon {   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
        this.bullet = "no sub weapon";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }    
}

枪类

public class GunImp implements Weapon {
    private String weaponName = null;
    private String bullet = null;
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

public class GunImp  {...}

public class GunImp implements Weapon {
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

我的问题是：

如果我不在下面的枪类和剑类中实现武器类，看起来这个函数仍然可以工作。。。那么为什么我们需要使用接口呢

剑类

public class SwordImp implements Weapon {
    private String weaponName = null;   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return "no sub weapon";
    }    
}

public class SwordImp {...}

public class SwordImp implements Weapon {   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
        this.bullet = "no sub weapon";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }    
}

枪类

public class GunImp implements Weapon {
    private String weaponName = null;
    private String bullet = null;
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

public class GunImp  {...}

public class GunImp implements Weapon {
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

我尝试将“所有”类放入“存储库”文件夹。这条路对吗？或者我需要将它们放入模型文件夹中吗

首先，我尝试将Gun类和Swarm类中的weaponName变量和bullet变量放入武器接口，因此我不需要在每个类中声明它们，如下所示：

武器接口

public interface Weapon {
    public void set(String weaponName);
    public String getWeapon();
    public String getSubWeapon();
}

public interface Weapon {
    private String weaponName = null;
    private String bullet = null;
    public void set(String weaponName);
    public String getWeapon();
    public String getSubWeapon();
}

剑类

public class SwordImp implements Weapon {
    private String weaponName = null;   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return "no sub weapon";
    }    
}

public class SwordImp {...}

public class SwordImp implements Weapon {   
    public void set(String weapon) {
        this.weaponName = "fire "+weapon;
        this.bullet = "no sub weapon";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }    
}

枪类

public class GunImp implements Weapon {
    private String weaponName = null;
    private String bullet = null;
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

public class GunImp  {...}

public class GunImp implements Weapon {
    public void set(String weapon) {
        this.weaponName = "ice "+weapon;
        this.bullet = "need bullet";
    }
    public String getWeapon() {
        return this.weaponName;
    }
    public String getSubWeapon() {
        return this.bullet;
    }
}

但这似乎是错误的。。。原因是什么

您可以使用抽象工厂模式在运行时注入特定武器，而不是在控制器中硬编码它们

考虑到您有100种不同的武器，很难将所有武器实现类添加到控制器中。您可以在google中找到此模式的示例和实现。这被认为是一种最佳做法

尝试遵循最佳实践。它将帮助您更好地学习和编写整洁且可维护的代码。是的，移动到模型文件夹更好

在OOP中，创建定义良好的对象非常重要。接口只能有常量字段和方法。无法更改接口中定义的状态

---

请阅读一些OOP的理论。您对类和接口的理解似乎非常有限，因此关于设计模式的理论讨论毫无意义。我认为阅读一些OOP和控制反转IOC对您很有用，我认为理解接口使用的最好方法是学习一些设计模式