package com.javarush.task.task37.task3707;
import java.io.Serializable;
import java.util.*;
/**
* Created by misha on 10/1/2017.
*/
public class AmigoSet<E> extends AbstractSet<E> implements Serializable,Cloneable,Set<E>{
private transient HashMap<E,Object> map;
private static final Object PRESENT = new Object();
public AmigoSet() {
map = new HashMap<>();
}
public AmigoSet(Collection<? extends E> collection){
int capacity = Math.max(16, (int)(collection.size()/0.75f +1));
map = new HashMap<E, Object>(capacity);
addAll(collection);
}
@Override
public Object clone() {
try {
AmigoSet copy = (AmigoSet)super.clone();
copy.map = (HashMap) map.clone();
return copy;
}
catch (Exception e) {
throw new InternalError();
}
}
@Override
public boolean add(E e) {
return map.put(e, PRESENT) == null;
}
@Override
public boolean remove(Object o) {
return map.remove(o)==PRESENT;
}
@Override
public void clear() {
map.clear();
}
@Override
public int size() {
return map.size();
}
@Override
public boolean isEmpty() {
if (map.isEmpty()) return true;
else
return false;
}
@Override
public boolean contains(Object o) {
if (map.containsValue(o)){return true;}
return false;
}
@Override
public Iterator iterator() {
return map.keySet().iterator();
}
}
package com.javarush.task.task37.task3707;
import java.io.Serializable;
import java.util.*;
/**
* Created by misha on 10/1/2017.
*/
public class AmigoSet<E> extends AbstractSet<E> implements Serializable,Cloneable,Set<E>{
private transient HashMap<E,Object> map;
private static final Object PRESENT = new Object();
public AmigoSet() {
map = new HashMap<>();
}
public AmigoSet(Collection<? extends E> collection){
int capacity = Math.max(16, (int)(collection.size()/0.75f +1));
map = new HashMap<E, Object>(capacity);
addAll(collection);
}
@Override
public Object clone() {
try {
AmigoSet copy = (AmigoSet)super.clone();
copy.map = (HashMap) map.clone();
return copy;
}
catch (Exception e) {
throw new InternalError();
}
}
@Override
public boolean add(E e) {
return map.put(e, PRESENT) == null;
}
@Override
public boolean remove(Object o) {
return map.remove(o)==PRESENT;
}
@Override
public void clear() {
map.clear();
}
@Override
public int size() {
return map.size();
}
@Override
public boolean isEmpty() {
if (map.isEmpty()) return true;
else
return false;
}
@Override
public boolean contains(Object o) {
if (map.containsValue(o)){return true;}
return false;
}
@Override
public Iterator iterator() {
return map.keySet().iterator();
}
}