1

@Override
    public int hashCode() {
        //設置初始值
        int result = 17;

        //假設有效域為: name,age,idCardNo,incomeAnnual,sex,brithDay
        int c = 0;
        //計算name (String為對象類型,他的計算直接調用本身的hashCode)
        c = name.hashCode();
        result = result * 37 + c;

        //計算age (int/byte/char/short類型,他的計算直接調用本身的值)
 

        c = this.getAge();
        result = result * 37 + c;

        //計算idCardNo (long類型,他的計算 (int)(field^(field >>> 32)) 無符號右移32位)
        c = (int) (this.idCardNo ^ (this.idCardNo >>> 32));
        result = result * 37 + c;

        //計算 incomeAnnual (double類型,他的計算 Double.doubleToLongBits(field)後,再按Long類型計算 )
        
 
//(float類型,他的計算 Float.floatToIntBits(field)  )
        long tmp = Double.doubleToLongBits(this.incomeAnnual);
        c = (int) (tmp ^ (tmp >>> 32));
        result = result * 37 + c;

        //計算 sex (sex為boolean類型,他的計算直接調用 c=sex?1:0)
        c = this.isSex() ? 1 : 0;
        result = result * 37
 
 + c;

        //計算 brithDay (brithDay為Date對象類型,他的計算直接調用 本身的hashCode)
        c = this.getBirthDay().hashCode();
        result = result * 37 + c;

        return result;
    }

計算hashCode通用計算公式