OperatorOverloader (Spring Framework 4.3.30.RELEASE API)

所有已知实现类:
StandardOperatorOverloader
```
public interface OperatorOverloader
```
By default the mathematical operators Operation support simple types like numbers. By providing an implementation of OperatorOverloader, a user of the expression language can support these operations on other types.
从以下版本开始:
3.0
作者:
Andy Clement

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Object`	`operate(Operation operation, Object leftOperand, Object rightOperand)`	Execute the specified operation on two operands, returning a result.
`boolean`	`overridesOperation(Operation operation, Object leftOperand, Object rightOperand)`	Return true if the operator overloader supports the specified operation between the two operands and so should be invoked to handle it.

- 方法详细资料
  - overridesOperation
```
boolean overridesOperation(Operation operation,
                           Object leftOperand,
                           Object rightOperand)
                    throws EvaluationException
```
    Return true if the operator overloader supports the specified operation between the two operands and so should be invoked to handle it.
    参数:
    operation - the operation to be performed
    leftOperand - the left operand
    rightOperand - the right operand
    返回:
    true if the OperatorOverloader supports the specified operation between the two operands
    抛出:
    EvaluationException - if there is a problem performing the operation
  - operate
```
Object operate(Operation operation,
               Object leftOperand,
               Object rightOperand)
        throws EvaluationException
```
    Execute the specified operation on two operands, returning a result. See Operation for supported operations.
    参数:
    operation - the operation to be performed
    leftOperand - the left operand
    rightOperand - the right operand
    返回:
    the result of performing the operation on the two operands
    抛出:
    EvaluationException - if there is a problem performing the operation