Examples of org.apache.commons.lang.builder.EqualsBuilder

org.apache.commons.lang.builder.EqualsBuilder
sun.com/docs/books/effective/index.html">Effective Java , by Joshua Bloch. In particular the rule for comparing doubles, floats, and arrays can be tricky. Also, making sure that equals() and hashCode() are consistent can be difficult.

Two Objects that compare as equals must generate the same hash code, but two Objects with the same hash code do not have to be equal.

All relevant fields should be included in the calculation of equals. Derived fields may be ignored. In particular, any field used in generating a hash code must be used in the equals method, and vice versa.

Typical use for the code is as follows:
```
 public boolean equals(Object obj) { if (obj instanceof MyClass == false) { return false; } if (this == obj) { return true; } MyClass rhs = (MyClass) obj; return new EqualsBuilder() .appendSuper(super.equals(obj)) .append(field1, rhs.field1) .append(field2, rhs.field2) .append(field3, rhs.field3) .isEquals(); } 
```
Alternatively, there is a method that uses reflection to determine the fields to test. Because these fields are usually private, the method, reflectionEquals, uses AccessibleObject.setAccessible to change the visibility of the fields. This will fail under a security manager, unless the appropriate permissions are set up correctly. It is also slower than testing explicitly.

A typical invocation for this method would look like:
```
 public boolean equals(Object obj) { return EqualsBuilder.reflectionEquals(this, obj); } 
```
@author Steve Downey @author Stephen Colebourne @author Gary Gregory @author Pete Gieser @author Arun Mammen Thomas @since 1.0 @version $Id: EqualsBuilder.java 161243 2005-04-14 04:30:28Z ggregory $

    }
    if (obj.getClass() != getClass()) {
      return false;
    }
    Attribute rhs = (Attribute) obj;
    return new EqualsBuilder().append(key, rhs.key).append(value, rhs.value).isEquals();
  }

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    }
    if (obj.getClass() != getClass()) {
      return false;
    }
    SelectorSegment rhs = (SelectorSegment) obj;
    return new EqualsBuilder().append(type, rhs.type).append(attributes, rhs.attributes)
        .append(modifiers, rhs.modifiers).append(hierarchyOperator, rhs.hierarchyOperator).isEquals();
  }

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    }
    if (obj.getClass() != getClass()) {
      return false;
    }
    Option<?> rhs = (Option<?>) obj;
    return new EqualsBuilder().append(element, rhs.element).isEquals();
  }

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        if (obj.getClass() != getClass())
        {
            return false;
        }
        ObjectProperties rhs = (ObjectProperties) obj;
        return new EqualsBuilder()
            .append(_properties, rhs._properties).isEquals();
    }

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      if (o == null) return false;
      if (o == this) return true;
      if (o.getClass() != getClass()) return false;


      ArtistPlayCount apc = (ArtistPlayCount) o;
          return new EqualsBuilder()
          .append(artist, apc.artist)
          .append(playCount, apc.playCount)
          .isEquals();
  }

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      if (o == null) return false;
      if (o == this) return true;
      if (o.getClass() != getClass()) return false;


      Album t = (Album) o;
          return new EqualsBuilder()
          .append(artist, t.artist)
          .append(name, t.name)
          .isEquals();
  }

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      if (o == null) return false;
      if (o == this) return true;
      if (o.getClass() != getClass()) return false;


      LibraryStatistics ls = (LibraryStatistics) o;
          return new EqualsBuilder()
          .append(artistCount, ls.artistCount)
          .append(albumCount, ls.albumCount)
          .append(trackCount, ls.trackCount)
          .append(totalLengthInBytes, ls.totalLengthInBytes)
          .append(totalLengthInSeconds, ls.totalLengthInSeconds)

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    if (o == null) return false;
    if (o == this) return true;
    if (o.getClass() != getClass()) return false;


    TagInfo ai = (TagInfo) o;
    return new EqualsBuilder()
    .append(tagName, ai.tagName)
    .append(summary, ai.summary)
    .append(content, ai.content)
    .isEquals();
  }

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      if (o == null) return false;
      if (o == this) return true;
      if (o.getClass() != getClass()) return false;


      TrackPlayCount tpc = (TrackPlayCount) o;
          return new EqualsBuilder()
          .append(track, tpc.track)
          .append(playCount, tpc.playCount)
          .isEquals();
  }

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    if (o == null) return false;
    if (o == this) return true;
    if (o.getClass() != getClass()) return false;


    LastFmUser u = (LastFmUser) o;
    return new EqualsBuilder()
    .append(lastFmUsername, u.lastFmUsername)
    .append(sessionKey, u.sessionKey)
    .isEquals();
  }

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