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import java.util.HashMap;

import java.util.IdentityHashMap;

class Test {

{

IdentityHashMap<Object, String> map = new IdentityHashMap<>();

A a = new A();

map.put(a, "value");

HashMap<Object, String> map2 = new HashMap<>();

map2.put(a, "value");

}

}

class A {

int i;

@Override

public boolean equals(Object obj) {

if (this == obj) {

return true;

}

if (obj == null) {

return false;

}

if (!(obj instanceof A)) {

return false;

}

A other = (A) obj;

if (i != other.i) {

return false;

}

return true;

}

}