@Overridepublic int hashCode() {//设置初始值int result = 17;//假设有效域为: name,age,idCardNo,incomeAnnual,sex,brithDayint c = 0;//计算name (String为对象类型,他的计算直接调用本身的hashCode)c = name.hashCode();result = result * 37 + c;//计算age (int/byte/char/short类型,他的计算直接调用本身的值)c = this.getAge();result = result * 37 + c;//计算idCardNo (long类型,他的计算 (int)(field^(field >>> 32)) 无符号右移32位)c = (int) (this.idCardNo ^ (this.idCardNo >>> 32));result = result * 37 + c;//计算 incomeAnnual (double类型,他的计算 Double.doubleToLongBits(field)后,再按Long类型计算 )//(float类型,他的计算 Float.floatToIntBits(field)  )long tmp = Double.doubleToLongBits(this.incomeAnnual);c = (int) (tmp ^ (tmp >>> 32));result = result * 37 + c;//计算 sex (sex为boolean类型,他的计算直接调用 c=sex?1:0)c = this.isSex() ? 1 : 0;result = result * 37 + c;//计算 brithDay (brithDay为Date对象类型,他的计算直接调用 本身的hashCode)c = this.getBirthDay().hashCode();result = result * 37 + c;return result;}

public class HashCodeTest{public static void Excute(){var man = new Man(){Age = 10,BirthDay = new DateTime(1950,1,1),IdCardNo = 2139095040,IncomeAnnual = 10000000.5,Name = "Aven",Sex = true};var hasCode = man.GetHashCode();Console.WriteLine(hasCode);}}class Man{public long IdCardNo { get; set; }public int Age { get; set; }public string Name { get; set; }public double IncomeAnnual { get; set; }public bool Sex { get; set; }public DateTime BirthDay { get; set; }public override int GetHashCode(){//设置初始值int result = 17;//假设有效域为: name,age,idCardNo,incomeAnnual,sex,brithDayint c = 0;//计算name (String为对象类型,他的计算直接调用本身的hashCode)c = Name.GetHashCode();result = result * 37 + c;//计算age (int/byte/char/short类型,他的计算直接调用本身的值)c = this.Age;result = result * 37 + c;//计算idCardNo (long类型,他的计算 (int)(field^(field >> 32)) 有符号右移32位,符号位不移动)c = (int)(this.IdCardNo ^ (this.IdCardNo >> 32));result = result * 37 + c;//计算 incomeAnnual (double类型,他的计算 BitConverter.DoubleToInt64Bits(field)后,再按Long类型计算 )//(float类型,他的计算 BitConverter.ToInt32(BitConverter.GetBytes(this.IncomeAnnual),0) )long tmp = BitConverter.DoubleToInt64Bits(this.IncomeAnnual);c = (int)(tmp ^ (tmp >> 32));result = result * 37 + c;//计算 sex (sex为boolean类型,他的计算直接调用 c=sex?1:0)c = this.Sex ? 1 : 0;result = result * 37 + c;//计算 brithDay (brithDay为Date对象类型,他的计算直接调用 本身的hashCode)c = this.BirthDay.GetHashCode();result = result * 37 + c;return result;}}