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我正在尝试将方法链接与类扩展和基类中定义的方法结合起来。但是，我很难让它工作，因为我对泛型还不是很熟悉。有人可以帮我让它工作吗？这将不胜感激。谢谢！

现在的情况：

public abstract class A<T extends A<?>> extends F // the base class, all others extend this one (either direct or indirect)
public T isLoaded() { // method defined in class A
    // Omitted
    return (T) this;
}

public class B extends A<B> // One of the classes that extends the base class
public D tapButton() // Method defined in class B

public class C extends A<C> // Another class that extends the base class, also has a child itself
public C setAmount(int amount) // method defined in class C

public class D extends C // Class that extends the previous one (C)
public E tapButtonTwo() // Method defined in class D, can't move this one level up to due to other parts of the code

尝试使用这些类和方法的代码：

// Failing scenario
protected void doSomething() {
    // I already have an instance of type B, but I omitted this part
    b.tapButton() // returns type D
        .isLoaded() // returns type C and is the cause of the problem
        .setAmount(10) // returns type C
        .tapButtonTwo() // fails on: cannot resolve method
}

// Scenario that does work:
protected void doSomething() {
    // I already have an instance of type B, but I omitted this part
    b.tapButton() // returns type D
        .setAmount(10) // now returns type D
        .tapButtonTwo() // works
}
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