Question

以下代码在jdk6中编译，但在jdk7中编译。请建议任何解决方法

public interface LocalCacheMap<K extends Comparable<? super K>, V>  
extends ClearableCache<K>, Iterable<V>{
    V get(K key);
}

public class Universe<K extends Comparable<? super K>, V, TSKEY extends Comparable<? super TSKEY>> extends MasterLocalCache<K>  
implements Iterable<V>, LocalCacheMap<K, V>, TsDaoInfo<TSKEY, K>, ValueConverter<K, Object, V>{
    public V get(K key) {
        return get(key, keyFunct);
    }
    abstract public TSKEY buildTsKey(K key, Date date);

    abstract public K getObjKey(TSKEY tsKey);

    abstract public Date getDateKey(TSKEY tsKey);

}

public class JdbcTimesSeriesCacheDef<K extends Comparable<? super K>, TSKEY extends Comparable<? super TSKEY>, LC extends Universe<K,?,TSKEY>&DataSourceProvider, T> extends AbstractRawTimeSeriesCacheDef<K, T, LC> {
    private final SqlDefs<T> defs;

}

使用jdk7编译时，我收到以下错误

Universe中的JdbcTimesSeriesCacheDef错误：get（K＃1）无法在LocalCacheMap中实现get（K＃2）

Answer 1

更改

LC extends Universe<K,?,TSKEY>&DataSourceProvider,

到

LC extends Universe<K,T,TSKEY>&DataSourceProvider,

Answer 2

我通过使用特定的值类型'V'代替“？”

解决了这个问题

public class JdbcTimesSeriesCacheDef，V，TSKEY extends Comparable，LC extends Universe＆amp; DataSourceProvider，T＆gt;扩展AbstractRawTimeSeriesCacheDef { 私有最终SqlDefs defs;

}

JDK7泛型不编译

2 个答案: