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 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,
                                                 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)