java.math.BigInteger.negate()方法的使用及代码示例

x33g5p2x  于2022-01-16 转载在 其他  
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本文整理了Java中java.math.BigInteger.negate()方法的一些代码示例，展示了BigInteger.negate()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。BigInteger.negate()方法的具体详情如下：
包路径：java.math.BigInteger
类名称：BigInteger
方法名：negate

BigInteger.negate介绍

[英]Returns a BigInteger whose value is the -this.
[中]返回一个BigInteger，其值为-this。

代码示例

代码示例来源：origin: google/guava

@Override
 public BigInteger apply(BigInteger x) {
  return x.negate();
 }
};

代码示例来源：origin: spring-projects/spring-framework

/**
 * Decode a {@link java.math.BigInteger} from the supplied {@link String} value.
 * <p>Supports decimal, hex, and octal notation.
 * @see BigInteger#BigInteger(String, int)
 */
private static BigInteger decodeBigInteger(String value) {
  int radix = 10;
  int index = 0;
  boolean negative = false;
  // Handle minus sign, if present.
  if (value.startsWith("-")) {
    negative = true;
    index++;
  }
  // Handle radix specifier, if present.
  if (value.startsWith("0x", index) || value.startsWith("0X", index)) {
    index += 2;
    radix = 16;
  }
  else if (value.startsWith("#", index)) {
    index++;
    radix = 16;
  }
  else if (value.startsWith("0", index) && value.length() > 1 + index) {
    index++;
    radix = 8;
  }
  BigInteger result = new BigInteger(value.substring(index), radix);
  return (negative ? result.negate() : result);
}

代码示例来源：origin: prestodb/presto

private static BigInteger bigDecimalToBigintFloorSaturatedCast(BigDecimal bigDecimal, int resultPrecision, int resultScale)
{
  BigDecimal rescaledValue = bigDecimal.setScale(resultScale, FLOOR);
  BigInteger unscaledValue = rescaledValue.unscaledValue();
  BigInteger maxUnscaledValue = bigIntegerTenToNth(resultPrecision).subtract(ONE);
  if (unscaledValue.compareTo(maxUnscaledValue) > 0) {
    return maxUnscaledValue;
  }
  BigInteger minUnscaledValue = maxUnscaledValue.negate();
  if (unscaledValue.compareTo(minUnscaledValue) < 0) {
    return minUnscaledValue;
  }
  return unscaledValue;
}

代码示例来源：origin: prestodb/presto

@Override
public BigInteger visitArithmeticUnary(ArithmeticUnaryContext ctx)
{
  BigInteger value = visit(ctx.expression());
  switch (ctx.operator.getType()) {
    case PLUS:
      return value;
    case MINUS:
      return value.negate();
    default:
      throw new IllegalStateException("Unsupported unary operator " + ctx.operator.getText());
  }
}

代码示例来源：origin: google/guava

/**
 * Equivalent to calling randomPositiveBigInteger(numBits) and then flipping the sign with 50%
 * probability.
 */
static BigInteger randomNonZeroBigInteger(int numBits) {
 BigInteger result = randomPositiveBigInteger(numBits);
 return RANDOM_SOURCE.nextBoolean() ? result : result.negate();
}

代码示例来源：origin: google/guava

/**
 * Returns the {@code BigInteger} value that is equal to {@code x} rounded with the specified
 * rounding mode, if possible.
 *
 * @throws ArithmeticException if
 *     <ul>
 *       <li>{@code x} is infinite or NaN
 *       <li>{@code x} is not a mathematical integer and {@code mode} is {@link
 *           RoundingMode#UNNECESSARY}
 *     </ul>
 */
// #roundIntermediate, java.lang.Math.getExponent, com.google.common.math.DoubleUtils
@GwtIncompatible
public static BigInteger roundToBigInteger(double x, RoundingMode mode) {
 x = roundIntermediate(x, mode);
 if (MIN_LONG_AS_DOUBLE - x < 1.0 & x < MAX_LONG_AS_DOUBLE_PLUS_ONE) {
  return BigInteger.valueOf((long) x);
 }
 int exponent = getExponent(x);
 long significand = getSignificand(x);
 BigInteger result = BigInteger.valueOf(significand).shiftLeft(exponent - SIGNIFICAND_BITS);
 return (x < 0) ? result.negate() : result;
}

代码示例来源：origin: google/guava

/**
 * Chooses a number in (-2^numBits, 2^numBits) at random, with density concentrated in numbers of
 * lower magnitude.
 */
static BigInteger randomBigInteger(int numBits) {
 while (true) {
  if (RANDOM_SOURCE.nextBoolean()) {
   return randomNonNegativeBigInteger(numBits);
  }
  BigInteger neg = randomNonNegativeBigInteger(numBits).negate();
  if (neg.signum() != 0) {
   return neg;
  }
 }
}

代码示例来源：origin: prestodb/presto

@Test
public void testAddReturnOverflow()
{
  assertAddReturnOverflow(TWO, TWO);
  assertAddReturnOverflow(MAX_DECIMAL_UNSCALED_VALUE, MAX_DECIMAL_UNSCALED_VALUE);
  assertAddReturnOverflow(MAX_DECIMAL_UNSCALED_VALUE.negate(), MAX_DECIMAL_UNSCALED_VALUE);
  assertAddReturnOverflow(MAX_DECIMAL_UNSCALED_VALUE, MAX_DECIMAL_UNSCALED_VALUE.negate());
  assertAddReturnOverflow(MAX_DECIMAL_UNSCALED_VALUE.negate(), MAX_DECIMAL_UNSCALED_VALUE.negate());
}

代码示例来源：origin: google/guava

public void testCheckPositive_negativeBigInteger() {
 try {
  MathPreconditions.checkPositive("BigInteger", BigInteger.ZERO.negate());
  fail();
 } catch (IllegalArgumentException expected) {
 }
}

代码示例来源：origin: google/guava

public void testCheckNonNegative_negativeBigInteger() {
 try {
  MathPreconditions.checkNonNegative("int", BigInteger.ONE.negate());
  fail();
 } catch (IllegalArgumentException expected) {
 }
}

代码示例来源：origin: prestodb/presto

@Test
public void testCombineUnderflow()
{
  addToState(state, TWO.pow(125).negate());
  addToState(state, TWO.pow(126).negate());
  LongDecimalWithOverflowState otherState = new LongDecimalWithOverflowStateFactory().createSingleState();
  addToState(otherState, TWO.pow(125).negate());
  addToState(otherState, TWO.pow(126).negate());
  DecimalSumAggregation.combine(state, otherState);
  assertEquals(state.getOverflow(), -1);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(126).negate()));
}

代码示例来源：origin: prestodb/presto

@Test
public void testUnderflowAfterOverflow()
{
  addToState(state, TWO.pow(126));
  addToState(state, TWO.pow(126));
  addToState(state, TWO.pow(125));
  assertEquals(state.getOverflow(), 1);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(125)));
  addToState(state, TWO.pow(126).negate());
  addToState(state, TWO.pow(126).negate());
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getOverflow(), 0);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(125).negate()));
  assertEquals(average(state, TYPE), new BigDecimal(TWO.pow(125).negate().divide(BigInteger.valueOf(6))));
}

代码示例来源：origin: prestodb/presto

@Test
public void testUnderflow()
{
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getLong(), 1);
  assertEquals(state.getOverflow(), 0);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(126).negate()));
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getLong(), 2);
  assertEquals(state.getOverflow(), -1);
  assertEquals(UnscaledDecimal128Arithmetic.compare(state.getLongDecimal(), unscaledDecimal(0)), 0);
  assertEquals(average(state, TYPE), new BigDecimal(TWO.pow(126).negate()));
}

代码示例来源：origin: prestodb/presto

@Test
public void testUnderflow()
{
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getOverflow(), 0);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(126).negate()));
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getOverflow(), -1);
  assertEquals(UnscaledDecimal128Arithmetic.compare(state.getLongDecimal(), unscaledDecimal(0)), 0);
}

代码示例来源：origin: prestodb/presto

private SqlDecimal randomDecimal(DecimalType type)
  {
    int maxBits = (int) (Math.log(Math.pow(10, type.getPrecision())) / Math.log(2));
    BigInteger bigInteger = new BigInteger(maxBits, random);
    if (bigInteger.equals(ZERO)) {
      bigInteger = ONE;
    }
    if (random.nextBoolean()) {
      bigInteger = bigInteger.negate();
    }
    return new SqlDecimal(bigInteger, type.getPrecision(), type.getScale());
  }
}

代码示例来源：origin: prestodb/presto

@Test
public void testUnderflowAfterOverflow()
{
  addToState(state, TWO.pow(126));
  addToState(state, TWO.pow(126));
  addToState(state, TWO.pow(125));
  assertEquals(state.getOverflow(), 1);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(125)));
  addToState(state, TWO.pow(126).negate());
  addToState(state, TWO.pow(126).negate());
  addToState(state, TWO.pow(126).negate());
  assertEquals(state.getOverflow(), 0);
  assertEquals(state.getLongDecimal(), unscaledDecimal(TWO.pow(125).negate()));
}

代码示例来源：origin: prestodb/presto

@LiteralParameters({"p", "s"})
  @SqlType("decimal(p, s)")
  public static Slice negate(@SqlType("decimal(p, s)") Slice arg)
  {
    BigInteger argBigInteger = Decimals.decodeUnscaledValue(arg);
    return encodeUnscaledValue(argBigInteger.negate());
  }
}

代码示例来源：origin: prestodb/presto

@Test
public void testLongDecimals()
    throws IOException
{
  assertReadsLongValue(BigInteger.valueOf(0L));
  assertReadsLongValue(BigInteger.valueOf(1L));
  assertReadsLongValue(BigInteger.valueOf(-1L));
  assertReadsLongValue(BigInteger.valueOf(-1).shiftLeft(126));
  assertReadsLongValue(BigInteger.valueOf(1).shiftLeft(126));
  assertReadsLongValue(BIG_INTEGER_127_BIT_SET);
  assertReadsLongValue(BIG_INTEGER_127_BIT_SET.negate());
  assertReadsLongValue(MAX_DECIMAL_UNSCALED_VALUE);
  assertReadsLongValue(MIN_DECIMAL_UNSCALED_VALUE);
}

代码示例来源：origin: prestodb/presto

@Test
public void testUnscaledBigIntegerToDecimal()
{
  assertConvertsUnscaledBigIntegerToDecimal(MAX_DECIMAL_UNSCALED_VALUE);
  assertConvertsUnscaledBigIntegerToDecimal(MIN_DECIMAL_UNSCALED_VALUE);
  assertConvertsUnscaledBigIntegerToDecimal(BigInteger.ZERO);
  assertConvertsUnscaledBigIntegerToDecimal(BigInteger.ONE);
  assertConvertsUnscaledBigIntegerToDecimal(BigInteger.ONE.negate());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void parseNumberAsNegativeHex() {
  String aByte = "-0x80";
  String aShort = "-0x8000";
  String anInteger = "-0x80000000";
  String aLong = "-0x8000000000000000";
  String aReallyBigInt = "FEBD4E677898DFEBFFEE44";
  assertNegativeByteEquals(aByte);
  assertNegativeShortEquals(aShort);
  assertNegativeIntegerEquals(anInteger);
  assertNegativeLongEquals(aLong);
  assertEquals("BigInteger did not parse",
      new BigInteger(aReallyBigInt, 16).negate(), NumberUtils.parseNumber("-0x" + aReallyBigInt, BigInteger.class));
}

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