java編譯器：
1 AddExpression.java
加法適用於: int,long,float,double,String
2 SubtractExpression.java
減法適用於: int,long,float,double
3 MultiplyExpression.java
乘法適用於: int,long,float,double
4 DivideExpression.java
除法適用於: int,long,float,double
5 RemainderExpression.java
求模適用於: int,long,float,double