类 NumberUtils

字段详细资料

• STANDARD_NUMBER_TYPES

  public static final Set<Class<?>> STANDARD_NUMBER_TYPES

  Standard number types (all immutable): Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal.

构造器详细资料

• NumberUtils

  public NumberUtils()

方法详细资料

• convertNumberToTargetClass

  public static <T extends Number> T convertNumberToTargetClass​(Number number,
                                                                Class<T> targetClass)
                                                         throws IllegalArgumentException

  Convert the given number into an instance of the given target class.

  参数:

  number - the number to convert

  targetClass - the target class to convert to

  返回:

  the converted number

  抛出:

  IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

  另请参阅:

  Byte, Short, Integer, Long, BigInteger, Float, Double, BigDecimal

• parseNumber

  public static <T extends Number> T parseNumber​(String text,
                                                 Class<T> targetClass)

  Parse the given text into a Number instance of the given target class, using the corresponding decode / valueOf method.

  Trims all whitespace (leading, trailing, and in between characters) from the input String before attempting to parse the number.

  Supports numbers in hex format (with leading "0x", "0X", or "#") as well.

  参数:

  text - the text to convert

  targetClass - the target class to parse into

  返回:

  the parsed number

  抛出:

  IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

  另请参阅:

  Byte.decode(java.lang.String), Short.decode(java.lang.String), Integer.decode(java.lang.String), Long.decode(java.lang.String), decodeBigInteger(String), Float.valueOf(java.lang.String), Double.valueOf(java.lang.String), BigDecimal(String)

• parseNumber

  public static <T extends Number> T parseNumber​(String text,
                                                 Class<T> targetClass,
                                                 @Nullable
                                                 NumberFormat numberFormat)

  Parse the given text into a Number instance of the given target class, using the supplied NumberFormat.

  Trims the input String before attempting to parse the number.

  参数:

  text - the text to convert

  targetClass - the target class to parse into

  numberFormat - the NumberFormat to use for parsing (if null, this method falls back to parseNumber(String, Class))

  返回:

  the parsed number

  抛出:

  IllegalArgumentException - if the target class is not supported (i.e. not a standard Number subclass as included in the JDK)

  另请参阅:

  NumberFormat.parse(java.lang.String, java.text.ParsePosition), convertNumberToTargetClass(java.lang.Number, java.lang.Class<T>), parseNumber(String, Class)