name clash: get(K)..and get(K)..have the same erasure,yet neither overrides the other

[gamerongvangtp]

name clash: get(K) in CachingSolution.FIFOCache and get(K) in CachingSolution.CacheAlgorithm have the same erasure, yet neither overrides the other

I can't override method get(K) in the FIFOCache.

Here is the class:

package CachingSolution;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

public class CacheAlgorithm<K, V> {

protected static final float hashTableLoadFactor = 0.75f;
protected LinkedHashMap<K, V> map;
protected int cacheSize;

public CacheAlgorithm(int cacheSize) {
this.cacheSize = cacheSize;
int hashTableCapacity = (int) Math.ceil(cacheSize / hashTableLoadFactor) + 1;
map = new LinkedHashMap<K, V>(hashTableCapacity, hashTableLoadFactor, false) {
// (an anonymous inner class)

private static final long serialVersionUID = 1;

@Override
protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
return size() > CacheAlgorithm.this.cacheSize;
}
};
}

public synchronized V get(K key) {
return map.get(key);
}

public synchronized void put(K key,V value) {
map.put(key, value);
}
public synchronized void clear() {
map.clear();
}

public synchronized int usedEntries() {
return map.size();
}
public synchronized Collection<Map.Entry<K, V>> getAll() {
return new ArrayList<Map.Entry<K, V>>(map.entrySet());
}

public synchronized Collection<V> values() {
return (Collection<V>) map.values();
}

public synchronized boolean containKey(K _key) {
return map.containsKey(_key);
}
}
-----------------
package CachingSolution;
public class FIFOCache<K, V> extends CacheAlgorithm{

public FIFOCache(int cacheSize){
super(cacheSize);
}
//@Override
public synchronized V get(K key) {
return map.get(key);
}

}

[JosAH]

You're extending from the raw class; make that:

public class FIFOCache<K, V> extends CacheAlgorithm<K, V> { ... }

kind regards,

Jos

[Tolls]

You can't declare a method with the same signature in a child class as one in the parent without overriding the parent.
Presumably that child class should read:

public class FIFOCache<K, V> extends CacheAlgorithm<K, V>

as well?

[gamerongvangtp]

I used an annotation @Override but it still have error , "method does not override or implement a method from a supertype".

[JosAH]

You did read the two previous replies did you?

kiind regards,

Jos

[Tolls]

I think we're invisible again.
I really must find a way to use my amazing powers for good!

[JosAH]

I think we're invisible again.
I really must find a way to use my amazing powers for good!

Mwah, being invisible has its advantages too; you'll get used to it ;-)

kind regards,

Jos

[DarrylBurke]

How sad that nobody responded in this thread.

db

[JosAH]

How sad that nobody responded in this thread.

Do I hear something?

kind regards,

Jos

[gamerongvangtp]

I read. But I don't know hoa to repair it.

[JosAH]

I read. But I don't know hoa to repair it.

Ahem, read reply #2 and #3 again. Tolls and I were both spoonfeeding you.

kind regards,

Jos

[gamerongvangtp]

Oh, OK. Thank you very much.