在Java中對初始化代碼進行分組的正確方法

我有一些具有相似屬性、方法和初始化代碼的東西。喜歡

public class LoadElement {

    LoadingElementBinding binding;

    public LoadElement(ViewGroup parent) {
        binding = LoadingElementBinding.inflate(
                       LayoutInflater.from(parent.getContext()),
                       parent,
                       false));
        binding.setLifecycleOwner(ViewTreeLifecycleOwner.get(parent));
    }

    public void doDomething() {
        //somehing do with binding
    }
}

public class ErrorElement {

    ErrorElementBinding binding;

    public ErrorElement(ViewGroup parent) {
        binding = ErrorElementBinding.inflate(
                       LayoutInflater.from(parent.getContext()),
                       parent,
                       false));
        binding.setLifecycleOwner(ViewTreeLifecycleOwner.get(parent));
    }

    public void doDomething() {
        //somehing do with binding
    }
}

我想將這段代碼分組并寫一些像

public abstract class BindingElement <T extends ViewDataBinding>{

    T binding;

    public BindingElement (ViewGroup parent) {
        binding = createBinding(LayoutInflater.from(parent.getContext()), parent);
        binding.setLifecycleOwner(ViewTreeLifecycleOwner.get(parent));
    }

    abstract T createBinding(ViewGroup parent, LayoutInflater inflater);

    public void doDomething() {
        //somehing do with binding
    }
}

public class LoadElement extends BindingElement<LoadingElementBinding>{

    public LoadElement(ViewGroup parent) {super(parent)}

    @Override LoadingElementBinding createBinding(ViewGroup parent, LayoutInflater inflater){
       return LoadingElementBinding.inflate(
                       LayoutInflater.from(parent.getContext()),
                       parent,
                       false));
    }
}

public class ErrorElement extends BindingElement<ErrorElementBinding>{

    public ErrorElement(ViewGroup parent) {super(parent)}

    @Override ErrorElementBinding createBinding(ViewGroup parent, LayoutInflater inflater){
       return ErrorElementBinding.inflate(
                       LayoutInflater.from(parent.getContext()),
                       parent,
                       false));
    }
}

它是分組的，當我添加新的類似類時，我永遠不會忘記確定我的屬性（系結）。但是這段代碼是錯誤的，因為我使用了建構式中的非最終函式或抽象函式。

但是我怎樣才能以 java oop 風格正確地分組我的代碼呢？

uj5u.com熱心網友回復：

您可以使用 lambda 運算式/方法參考：

@FunctionalInterface
public interface BindingCreator<T extends ViewDataBinding>{
    T createBinding(LayoutInflater inflator, ViewGroup parent, boolean addToParent);
}


public abstract class BindingElement <T extends ViewDataBinding>{
    T binding;//maybe make it protected
    public BindingElement(ViewGroup parent, BindingCreator<T> bindingCreator){
        binding = bindingCreator.createBinding(
                       LayoutInflater.from(parent.getContext()),
                       parent,
                       false));
        binding.setLifecycleOwner(ViewTreeLifecycleOwner.get(parent));
    }

    public void doDomething() {
        //somehing do with binding
    }
}

public class LoadElement extends BindingElement<LoadingElementBinding>{
    public LoadElement(ViewGroup parent) {
        super(parent, LoadingElementBinding::inflate);
    }

}
public class ErrorElement extends BindingElement<ErrorElementBinding>{

    public LoadElement(ViewGroup parent) {
        super(parent, ErrorElementBinding::inflate);
    }

}

BindingCreator包含一個“單個抽象方法”createBinding并且運算式（方法參考）LoadingElementBinding::inflate創建一個BindingCreatorwherecreateBinding是通過LoadingElementBinding.inflate使用相同的引數呼叫來實作的。像這樣的實體只是傳遞給超級建構式。

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