Enum UnaryOperator

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<UnaryOperator>

    public enum UnaryOperator
    extends java.lang.Enum<UnaryOperator>
    Unary operators used in expressions.
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      IS_WHITESPACE
      Evaluates whether the operand is a string of only whitespace characters
      LENGTH
      Evaluates the length of a collection
      NOT
      Evaluates to logical negation of the operand
    • Method Summary

      All Methods Static Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      abstract java.lang.Object eval​(java.lang.Object operand)  
      static UnaryOperator valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static UnaryOperator[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • NOT

        public static final UnaryOperator NOT
        Evaluates to logical negation of the operand
      • IS_WHITESPACE

        public static final UnaryOperator IS_WHITESPACE
        Evaluates whether the operand is a string of only whitespace characters
      • LENGTH

        public static final UnaryOperator LENGTH
        Evaluates the length of a collection
    • Method Detail

      • values

        public static UnaryOperator[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
        for (UnaryOperator c : UnaryOperator.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static UnaryOperator valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • eval

        public abstract java.lang.Object eval​(java.lang.Object operand)