java - 我的类用方法实现接口(interface)。未实现但没有错误

Question

我创建了 dao 类，它实现了具有两个方法的接口(interface)。它们都没有在该 dao 类中实现。我没有收到任何错误。一切都编译并运行。

我做错了什么？

这是我的 dao 类:

package com.derp.generic.dao;

import javax.persistence.MappedSuperclass;
import org.springframework.stereotype.Repository;

import com.derp.generic.model.GenericDictionaryModel;

@Repository
@MappedSuperclass
public abstract class GenericDictionaryModelDaoImpl <T extends GenericDictionaryModel<?>> extends GenericModelDaoImpl implements GenericDictionaryModelDao {
}

这是我的界面:

package com.derp.generic.dao;

public interface GenericDictionaryModelDao<T> extends GenericModelDao<T>{
    public T getByName(String name);
    public T getByActive(boolean active);
}

其余类(class):

package com.derp.generic.dao;

import java.util.List;

public interface GenericModelDao<T> {
    public void add(T entityClass);
    public void update(T entityClass);
    public void delete(long id);
    public T get(long id);
    public List<T> get();
    public String toString();
}

package com.derp.generic.model;

import javax.persistence.MappedSuperclass;

@MappedSuperclass
public abstract class GenericDictionaryModel<T extends GenericDictionaryModel<?>> extends GenericModel<T> {
    private String name;
    private boolean active;

    public String getName() {return name;}
    public void setName(String name) {this.name = name;}
    public boolean getActive() {return active;}
    public void setActive(boolean stat) {this.active = stat;}
}

package com.derp.generic.model;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;

@MappedSuperclass
public abstract class GenericModel<T extends GenericModel<?>> {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    public long getId() {return id;}
    public void setId(long id) {this.id = id;}

}

Answer 1

您的 GenericDictionaryModelDaoImpl 类是抽象的，因此它不必实现 GenericDictionaryModelDao 接口(interface)的所有方法。任何将从抽象类继承的具体类都必须实现该接口(interface)的所有未实现的方法。