BigDecimail转为负数 BigDecimail 转负数negate()
new BigDecimail().negate()    返回负数
：
1 /**
2    * Returns a {@code BigDecimal} whose value is {@code (-this)},
3    * and whose scale is {@code this.scale()}.
4    *
5    * @return {@code -this}.
6    */
7    public BigDecimal negate() {
8        if (intCompact == INFLATED) {
9            return new ate(), INFLATED, scale, precision);
10        } else {
11            return valueOf(-intCompact, scale, precision);
12        }
13    }
bigdecimal转换为integer14
1 /**
2    * Trusted package private constructor.
3    * Trusted simply means if val is INFLATED, intVal could not be null and
4    * if intVal is null, val could not be INFLATED.
5    */
6    BigDecimal(BigInteger intVal, long val, int scale, int prec) {
7        this.scale = scale;
8        this.precision = prec;
9        this.intCompact = val;
10        this.intVal = intVal;
11    }
1/**
2    * Translates a {@code long} value into a {@code BigDecimal}
3    * with a scale of zero.  This {@literal "static factory method"}
4    * is provided in preference to a ({@code long}) constructor
5    * because it allows for reuse of frequently used
6    * {@code BigDecimal} values.
7    *
8    * @param val value of the {@code BigDecimal}.
9    * @return a {@code BigDecimal} whose value is {@code val}.
10    */
11 static BigDecimal valueOf(long unscaledVal, int scale, int prec) {
12        if (scale == 0 && unscaledVal >= 0 && unscaledVal < zeroThroughTen.length) {
13            return zeroThroughTen[(int) unscaledVal];
14        } else if (unscaledVal == 0) {
15            return zeroValueOf(scale);
16        }
17        return new BigDecimal(unscaledVal == INFLATED ? INFLATED_BIGINT : null,
18                unscaledVal, scale, prec);
19    }
1 /**
2    * Sentinel value for {@link #intCompact} indicating the
3    * significand information is only available from {@code intVal}.
4    */
5    static final long INFLATED = Long.MIN_VALUE;
6
7/**
8    * A constant holding the minimum value a {@code long} can
9    * have, -2<sup>63</sup>.
10    */
11    @Native public static final long MIN_VALUE = 0x8000000000000000L; int与的相互转换
1int转bigdecimal
2
3
4BigDecimal number = new BigDecimal(0);
5
6int value=score;
7
8number=BigDecimal.valueOf((int)value);
9
1
2bigdecimal转int
3
4
5BigDecimal b=new BigDecimal(45.45);
6int a = b.intValue();

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