【Java】BigDecimal

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关于 BigDecimal 的介绍和工具类请看：BigDecimal介绍和使用
在购物项目中的 BigDecimal 使用：
import android.util.Log;import java.math.BigDecimal;import java.math.RoundingMode;import java.text.NumberFormat;import java.text.ParseException;import java.util.Locale;public class Money {    private BigDecimal _value;    public Money() {        _value = BigDecimal.ZERO.setScale(2, RoundingMode.HALF_UP);    }    public Money(long l) {        _value = (new BigDecimal(l)).setScale(2, RoundingMode.HALF_UP);    }    public Money(String s) {        try {            _value = (new BigDecimal(toBigDecimalString(s))).setScale(2,                    RoundingMode.HALF_UP);            return;        } catch (NumberFormatException numberformatexception) {            Log.d("NAB Number Format Exception",                    numberformatexception.getMessage());            _value = BigDecimal.ZERO;        }    }    public Money(BigDecimal bigdecimal) {        if (bigdecimal == null) {            bigdecimal = BigDecimal.ZERO;        }        _value = bigdecimal;        _value = _value.setScale(2, RoundingMode.HALF_UP);    }    public static Money add(Money money, Money amoney[]) {        BigDecimal bigdecimal = money.toBigDecimal();        if (amoney != null) {            int i = amoney.length;            for (int j = 0; j < i; j++) {                Money money1 = amoney[j];                if (money1 != null) {                    bigdecimal = bigdecimal.add(money1.toBigDecimal());                }            }        }        return new Money(bigdecimal);    }    public static Money divide(Money money, int i) {        return divide(money._value, new BigDecimal(i));    }    public static Money divide(Money money, Money money1) {        return divide(money._value, money1._value);    }    public static Money divide(Money money, BigDecimal bigdecimal) {        return divide(money._value, bigdecimal);    }    public static Money divide(BigDecimal bigdecimal, Money money) {        return divide(bigdecimal, money._value);    }    private static Money divide(BigDecimal bigdecimal, BigDecimal bigdecimal1) {        return new Money(bigdecimal.divide(bigdecimal1, RoundingMode.HALF_UP)                .setScale(2, RoundingMode.HALF_UP));    }    public static Money multiply(Money money, int i) {        return multiply(money._value, new BigDecimal(i));    }    public static Money multiply(Money money, Money money1) {        return multiply(money._value, money1._value);    }    public static Money multiply(Money money, BigDecimal bigdecimal) {        return multiply(money._value, bigdecimal);    }    private static Money multiply(BigDecimal bigdecimal, BigDecimal bigdecimal1) {        return new Money(bigdecimal.multiply(bigdecimal1).setScale(2,                RoundingMode.HALF_UP));    }    public static Money multiplyRoundDown(Money money, BigDecimal bigdecimal) {        return new Money(money._value.multiply(bigdecimal).setScale(2,                RoundingMode.FLOOR));    }    public static Money multiplyRoundUp(Money money, BigDecimal bigdecimal) {        return new Money(money._value.multiply(bigdecimal)                .setScale(3, RoundingMode.FLOOR)                .setScale(2, RoundingMode.CEILING));    }    public static Money subtract(Money money, Money amoney[]) {        BigDecimal bigdecimal = money.toBigDecimal();        int i = amoney.length;        for (int j = 0; j < i; j++) {            bigdecimal = bigdecimal.subtract(amoney[j].toBigDecimal());        }        return new Money(bigdecimal);    }    public static Money subtract(BigDecimal bigdecimal,            Money amoney[]) {        int i = amoney.length;        for (int j = 0; j < i; j++) {            bigdecimal = bigdecimal.subtract(amoney[j].toBigDecimal());        }        return new Money(bigdecimal);    }    public static String toBigDecimalString(String s) {        String s1;        try {            s1 = NumberFormat.getCurrencyInstance(Locale.CHINA).parse(s)                    .toString();        } catch (ParseException parseexception) {            return s;        }        return s1;    }    public Money add(Money money) {        if (money != null) {            _value = _value.add(money._value);        }        return this;    }    public Money add(BigDecimal bigdecimal) {        if (bigdecimal != null) {            _value = _value.add(bigdecimal.setScale(2, RoundingMode.HALF_UP));        }        return this;    }    public BigDecimal addByValue(Money money) {        return _value.add(money._value);    }    public Money divide(BigDecimal bigdecimal) {        _value = _value.divide(bigdecimal.setScale(2, RoundingMode.HALF_UP));        return this;    }    public boolean isEqualTo(Money money) {        return toFormattedString().equals(money.toFormattedString());    }    public boolean isGreaterThan(Money money) {        return 1 == _value.compareTo(money._value);    }    public boolean isGreaterThan(BigDecimal bigdecimal) {        return 1 == _value.compareTo(bigdecimal);    }    public boolean isGreaterThanZero() {        return 1 == _value.compareTo(BigDecimal.ZERO);    }    public boolean isLessThan(Money money) {        return -1 == _value.compareTo(money._value);    }    public boolean isLessThan(BigDecimal bigdecimal) {        return -1 == _value.compareTo(bigdecimal);    }    public boolean isLessThanZero() {        return -1 == _value.compareTo(BigDecimal.ZERO);    }    public Money multiply(BigDecimal bigdecimal) {        _value = _value.multiply(bigdecimal.setScale(2, RoundingMode.HALF_UP));        return this;    }    public Money subtract(Money money) {        _value = _value.subtract(money._value);        return this;    }    public BigDecimal subtractByValue(Money money) {        return _value.subtract(money._value);    }    public BigDecimal toBigDecimal() {        return _value;    }    public double toDouble() {        return _value.doubleValue();    }    public String toFormattedString() {        return NumberFormat.getCurrencyInstance(Locale.CHINA).format(toDouble());    }        public int toInt() {        return _value.intValue();    }    public long toLong() {        return _value.longValue();    }    public String toPlainString() {        return _value.toPlainString();    }    public String toString() {        return toFormattedString();    }        public String toStringForIntegral() {        return String.valueOf("Integral : " + toInt());    }        //by Lu    public String toDefaultString() {    return _value.toString();    }}
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