Seeking full stack contract developer. Must be proficient in: Java, Scala, or C#; git (GitHub), bzr (Launchpad), or similar. Must have solid understanding of: race condition detection and avoidance; scalable data integrity architectural concepts (replication, sharding, etc.); rapid software development best practices (unit tests, continuous inte…

Id.java

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\*======================================================================*/

import java.util.HashSet;

class Id {
    private HashSet<Integer> _all_ids;

    public Id(final int id) {
        this._my_id = id;
    }

    public void cleanUp() {
        if (! this._cleaned) {
            this._all_ids.remove(this._my_id);
            this._cleaned = true;
        }
    }

    protected finalize() {
        this.cleanUp();
    }

    private int _my_id;
    private boolean _cleaned = false;
}

Id was not added to HashSet , but trying to remove

and HashSet is not initialized

package com.spotdox.android.app;

import java.util.HashSet;

class Id {
private HashSet _all_ids;

public Id(Integer id) {

    if(_all_ids==null)
        _all_ids= new HashSet<Integer>();
    this._my_id = id;
    this._all_ids.add(id);
}

public void cleanUp() {
    if (! this._cleaned) {
            this._all_ids.remove(this._my_id);
            this._cleaned = true;

    }
}

protected void finalize() {
    this.cleanUp();
}

private Integer _my_id;
private boolean _cleaned = false;

}

@jewelsub, we appreciate the "submission", but please review the instructions. Thanks!