protected Object calculateItem(Object obj){
        if(obj == null){
            return null;
        }
        if(obj instanceof Number){
            return obj;
        }
        if(obj instanceof Boolean){
            return obj;
        }
        if(obj instanceof String){
            return obj;
        }
        if(obj instanceof Elobj){
            return ((Elobj) obj).fetchVal();
        }
        if(obj instanceof Operator){
            return ((Operator) obj).calculate();
        }
        throw new ElException("未知计算类型!" + obj);
        
    }
protected Object calculateItem(Object obj){
        if(obj == null){
            return null;
        }
        if(obj instanceof Number){
            return obj;
        }
        if(obj instanceof Boolean){
            return obj;
        }
        if(obj instanceof String){
            return obj;
        }
        if(obj instanceof Elobj){
            return ((Elobj) obj).fetchVal();
        }
        if(obj instanceof Operator){
            return ((Operator) obj).calculate();
        }
        throw new ElException("未知计算类型!" + obj);
        
    }
protected Object calculateItem ( Object obj ) { if ( obj == null ) { return null ; } if ( obj instanceof Number ) { return obj ; } if ( obj instanceof Boolean ) { return obj ; } if ( obj instanceof String ) { return obj ; } if ( obj instanceof Elobj ) { return ( ( Elobj ) obj ) . fetchVal ( ) ; } if ( obj instanceof Operator ) { return ( ( Operator ) obj ) . calculate ( ) ; } throw new ElException ( "未知计算类型!" + obj); }
计算子项
计算子项