net.objecthunter.exp4j.operator

类 Operator

java.lang.Object

net.objecthunter.exp4j.operator.Operator

public abstract class Operator
extends Object

Class representing operators that can be used in an expression

字段概要

字段

限定符和类型	字段和说明
static char[]	ALLOWED_OPERATOR_CHARS The set of allowed operator chars
static int	PRECEDENCE_ADDITION The precedence value for the addition operation
static int	PRECEDENCE_DIVISION The precedence value for the division operation
static int	PRECEDENCE_MODULO The precedence value for the modulo operation
static int	PRECEDENCE_MULTIPLICATION The precedence value for the multiplication operation
static int	PRECEDENCE_POWER The precedence value for the power operation
static int	PRECEDENCE_SUBTRACTION The precedence value for the subtraction operation
static int	PRECEDENCE_UNARY_MINUS The precedence value for the unary minus operation
static int	PRECEDENCE_UNARY_PLUS The precedence value for the unary plus operation

构造器概要

构造器

构造器和说明
Operator(String symbol, int numberOfOperands, boolean leftAssociative, int precedence) Create a new operator for use in expressions

方法概要

限定符和类型	方法和说明
abstract double	apply(double... args) Apply the operation on the given operands
int	getNumOperands() Get the number of operands
int	getPrecedence() Check the precedence value for the operator
String	getSymbol() Get the operator symbol
static boolean	isAllowedOperatorChar(char ch) Check if a character is an allowed operator char
boolean	isLeftAssociative() Check if the operator is left associative

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

PRECEDENCE_ADDITION

public static final int PRECEDENCE_ADDITION

The precedence value for the addition operation

另请参阅:

常量字段值

PRECEDENCE_SUBTRACTION

public static final int PRECEDENCE_SUBTRACTION

The precedence value for the subtraction operation

另请参阅:

常量字段值

PRECEDENCE_MULTIPLICATION

public static final int PRECEDENCE_MULTIPLICATION

The precedence value for the multiplication operation

另请参阅:

常量字段值

PRECEDENCE_DIVISION

public static final int PRECEDENCE_DIVISION

The precedence value for the division operation

另请参阅:

常量字段值

PRECEDENCE_MODULO

public static final int PRECEDENCE_MODULO

The precedence value for the modulo operation

另请参阅:

常量字段值

PRECEDENCE_POWER

public static final int PRECEDENCE_POWER

The precedence value for the power operation

另请参阅:

常量字段值

PRECEDENCE_UNARY_MINUS

public static final int PRECEDENCE_UNARY_MINUS

The precedence value for the unary minus operation

另请参阅:

常量字段值

PRECEDENCE_UNARY_PLUS

public static final int PRECEDENCE_UNARY_PLUS

The precedence value for the unary plus operation

另请参阅:

常量字段值

ALLOWED_OPERATOR_CHARS

public static final char[] ALLOWED_OPERATOR_CHARS

The set of allowed operator chars

构造器详细资料

Operator

public Operator(String symbol,
                int numberOfOperands,
                boolean leftAssociative,
                int precedence)

Create a new operator for use in expressions

参数:

symbol - the symbol of the operator

numberOfOperands - the number of operands the operator takes (1 or 2)

leftAssociative - set to true if the operator is left associative, false if it is right associative

precedence - the precedence value of the operator

方法详细资料

isAllowedOperatorChar

public static boolean isAllowedOperatorChar(char ch)

Check if a character is an allowed operator char

参数:

ch - the char to check

返回:

true if the char is allowed an an operator symbol, false otherwise

isLeftAssociative

public boolean isLeftAssociative()

Check if the operator is left associative

返回:

true os the operator is left associative, false otherwise

getPrecedence

public int getPrecedence()

Check the precedence value for the operator

返回:

the precedence value

apply

public abstract double apply(double... args)

Apply the operation on the given operands

参数:

args - the operands for the operation

返回:

the calculated result of the operation

getSymbol

public String getSymbol()

Get the operator symbol

返回:

the symbol

getNumOperands

public int getNumOperands()

Get the number of operands

返回:

the number of operands