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This library provides HashCodeBuilder which is referred to build a good hashCode method for any class.

The following is the approach taken. When appending a data field, the current total is multiplied by the multiplier then a relevant value for that data type is added. For example, if the current hashCode is 17, and the multiplier is 37, then appending the integer 45 will create a hash code of 674, namely 17 * 37 + 45.

Features:

• append: Append a hashCode for a boolean. This adds 1 when true, and 0 when false to the hashCode. This is in contrast to the standard java.lang.Boolean.hashCode handling, which computes a hashCode value of 1231 for java.lang.Boolean instances that represent true or 1237 for java.lang.Boolean instances that represent false. This is in accordance with the Effective Java design.
• appendArray: Append a hashCode for an array.
• toHash: Return the computed hashCode.