任何类型的Java泛型<？>(Java Generics With Any Type )

 我正在尝试用Java编写一个方法，该方法能够将自定义Key对象添加到数组中，或者更改数组中已存在的键（如果有）。 但是，我似乎无法让它发挥作用。 键将使用的类型主要是String和Integer，但我的通用方法似乎不起作用。 
 
 setValue（）方法将T作为参数类型，getValue（）返回T. 
 
public void set(Key<?> key) {
    for (int i = 0; i < settings.size(); i++) {
        Key<?> k = settings.get(i);
        if (k.getName().equals(key.getName())) {
            k.setValue(key.getValue()); // Error here
            break;
        }
    }
    settings.add(key);
}
 
 错误（我正在使用Eclipse）是： 
 
The method setValue(capture#4-of ?) in the type Key<capture#4-of ?>
is not applicable for the arguments (capture#5-of ?)

I'm trying to write a method in Java that will be able to add a custom Key object to an array, or change an already existing key in the array if there is one. However, I can't seem to get it to work. The types that keys will use are primarily be String and Integer, but my universal approach doesn't seem to work.
 
The setValue() method has T as the parameter type, and getValue() returns T.
 
public void set(Key<?> key) {
    for (int i = 0; i < settings.size(); i++) {
        Key<?> k = settings.get(i);
        if (k.getName().equals(key.getName())) {
            k.setValue(key.getValue()); // Error here
            break;
        }
    }
    settings.add(key);
}
 
The error (I'm using Eclipse) is:
 
The method setValue(capture#4-of ?) in the type Key<capture#4-of ?>
is not applicable for the arguments (capture#5-of ?)

原文：https://stackoverflow.com/questions/22391964