Implement a long object wrapper which allows changing the long value in Java

/*from ww  w  .ja  v a2 s .c om*/
//package edu.northwestern.at.utils;

/*  Please see the license information at the end of this file. */

import java.io.Serializable;

/**  Implements a long object wrapper which allows changing the long value.
 *
 *  <p>
 *  The built-in Java Long class does not allow changing the value
 *  of the wrapped Long value once the Long object is created.
 *  MutableLong provides most of the same methods as Long but adds
 *  extra methods to allow changing the value of the stored long.
 *  This is useful when wrapping longs for storage in collection types
 *  since it is much more efficient to update the value of an existing
 *  MutableLong than to create a new Long every time the value
 *  changes.
 *  </p>
 */

public class MutableLong extends Number implements Serializable
{
  /**  The long wrapped here. */

  protected long mutableLong;

  /**  Create MutableLong object from an int value.
   *
   *  @param  l  The long being wrapped.
   */

  public MutableLong( long l )
  {
    mutableLong  = l;
  }

  /**  Create MutableLong object from a string.
   *
   *  @param  s  String containing an integer value.
   */

  public MutableLong( String s )
    throws NumberFormatException
  {
    mutableLong  = Long.parseLong( s );
  }

  /**   Compares this object to another object.
   *
   *  @param  obj    The other object.
   */

  public int compareTo( Object obj )
  {
    return compareTo( (Number)obj );
  }

  /**   Compares this number to another number.
   *
   *  @param  number  The other number.
   */

  public int compareTo( Number number )
  {
    return doCompare( mutableLong , number.longValue() );
  }

  protected int doCompare( long i , long j )
  {
    return ( i >= j ) ? ( (int)( ( i != j ) ? 1 : 0 ) ) : -1;
  }

  public boolean equals( Object obj )
  {
    if ( ( obj != null ) && ( obj instanceof Number ) )
    {
      return ( mutableLong == ((Number)obj).longValue() );
    }
    else
    {
      return false;
    }
  }

  public int hashCode()
  {
    return (int)mutableLong;
  }

  public byte byteValue()
  {
    return (byte)mutableLong;
  }

  public short shortValue()
  {
    return (short)mutableLong;
  }

  public int intValue()
  {
    return (int)mutableLong;
  }

  public long longValue()
  {
    return mutableLong;
  }

  public float floatValue()
  {
    return (float)mutableLong;
  }

  public double doubleValue()
  {
    return (double)mutableLong;
  }

  public String toString()
  {
    return String.valueOf( mutableLong );
  }

  public void setValue( byte aByte )
  {
    mutableLong  = aByte;
  }

  public void setValue( short aWord )
  {
    mutableLong  = aWord;
  }

  public void setValue( int i )
  {
    mutableLong  = (long)i;
  }

  public void setValue( long l )
  {
    mutableLong  = l;
  }

  public void setValue( float f )
  {
    mutableLong  = (long)f;
  }

  public void setValue( double d )
  {
    mutableLong  = (long)d;
  }

  public Long toLong()
  {
    return new Long( mutableLong );
  }
}

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   Northwestern University
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