Java非检查代码

我写了一个简单的类（StringPool本身的优点不是我的问题；我想要这个类有具体的原因）：

当我编译它时，编译器注意到它使用未经检查或不安全的操作：

warning: [unchecked] unchecked call to WeakReference(T) as a member of the raw type WeakReference       
    m_pool.put(s,new WeakReference(s));
    ^   where T is a type-variable:
    T extends Object declared in class WeakReference 

warning: [unchecked] unchecked call to put(K,V) as a member of the raw type WeakHashMap 
    m_pool.put(s,new WeakReference(s));
    ^   where K,V are type-variables:
    K extends Object declared in class WeakHashMap
    V extends Object declared in class WeakHashMap

2 warnings

如何修复这些警告，使代码编译干净且正确？

添加泛型：

WeakHashMap<String, WeakReference<String>>

以及：

看起来像：

m_pool.get(s);

及

各自的。

使用泛型：

public final class StringPool {

    private WeakHashMap<String, WeakReference<String>> m_pool = new WeakHashMap<String, WeakReference<String>>();

    public String intern(String s) {
        WeakReference<String> reference = m_pool.get(s);
        if (reference != null) {
            String interned = reference.get();
            if (interned != null)
                return interned;
        }
        m_pool.put(s, new WeakReference<String>(s));
        return s;
    }
};

公共最终类字符串池{
私有WeakHashMap m_pool=新WeakHashMap（）；
公共字符串实习生（字符串s）{
WeakReference reference=m_pool.get（s）；
如果（引用！=null）{
字符串interned=reference.get（）；
如果（实习！=null）
返回实习；
}
m_pool.put（s，新WeakReference（s））；
返回s；
}
};

(String)reference.get()

m_pool.get(s);

reference.get()

public final class StringPool {

    private WeakHashMap<String, WeakReference<String>> m_pool = new WeakHashMap<String, WeakReference<String>>();

    public String intern(String s) {
        WeakReference<String> reference = m_pool.get(s);
        if (reference != null) {
            String interned = reference.get();
            if (interned != null)
                return interned;
        }
        m_pool.put(s, new WeakReference<String>(s));
        return s;
    }
};