Question

我有几个课程

    public interface Identity<I> {
        public I getId();
    }

    public interface Position<T,I> {        
        public I getId();
        public T getData();
        public int getX();  
        public int getY();
    }

    public interface SpartialIndex<T,I extends Position<T,I>> {

        public void add(T t);
        public void addAll(SpartialIndex<T,I> index);
        //
        public void remove(T t);
        public void removeAll(SpartialIndex<T,I> index);
        //
        public int size();
        //
        public SpartialIndex<T,I> getRectangle(int left,int top,int right,int bottom);
        public SpartialIndex<T,I> getCircle(int centerX,int centerY,int radius);
        //
        public void translate(SpartialIndex<T,I> index,int translateX,int translateY);

        public List<T> getClosests(int x,int y);

        public List<T> get(I id);

    }

但是当我尝试创建默认实现时，我似乎无法使泛型工作。我不会用这条消息编译。

绑定不匹配：类型I不是有界的有效替代参数＆lt; I extends Position＆lt; T，I＆gt;＆gt; SpartialIndex类型＆lt; T，I＆gt;

     public class  DefaultSpartialIndex<T,I> implements SpartialIndex<T,I> {

        public DefaultSpartialIndex() {
            super();
        }

        @Override
        public void add(T t) { }

        @Override
        public void addAll(SpartialIndex<T,I> index) { }

        @Override
        public void remove(T t) {}

        @Override
        public void removeAll(SpartialIndex<T, I> index) { }

        @Override
        public int size() {
            return 0;
        }
        @Override
        public SpartialIndex<T, I> getRectangle(int left, int top, int right,int bottom) {
            return null;
        }

        @Override
        public SpartialIndex<T, I> getCircle(int centerX, int centerY, int radius) {        
            return null;
        }
        @Override
        public void translate(SpartialIndex<T, I> index, int translateX,int translateY) { }
        @Override
        public List<T> getClosests(int x, int y) {  
            return null;
        }
        @Override
        public List<T> get(I id) {      
            return null;
        }
    }

Answer 1

只是一个错字。

替换：

public interface SpartialIndex<T,I extends Position<T,I>>

由：

public interface SpartialIndex<T,I> extends Position<T,I>

具有多个通用边界的Java接口继承

1 个答案: