Ubuntu 下codeblocks编译C++，更改头文件后编译不成功问题

Question

我的系统是Ubuntu18，codeblocks IDE，在复习C++，本来编译是没有问题的，更改头文件后出现问题，编译器貌似无视了我对头文件和类外定义文件的修改，检查target没有问题。代码如下，应该是没有问题的：
main文件：

#include <iostream>
#include "Box.h"

using namespace std;

int main(){
    Box box1;
    Box box2{10,10,10,10};
    Box box3{10};
    Box box4{10,10};
    box1.test();
    cout<<box1.volume()<<endl;
    cout<<box2.volume()<<endl;
//    cout<<box4.get_count()<<endl;

}

Box.h 头文件

#ifndef BOX_H
#define BOX_H


class Box
{
    public:
        Box();
        Box(double lv,double wv,double hv,double n);
        explicit Box(double side);
        Box(int i,int n);
        double volume();
        void test();

        int get_count();

    private:
        double length{1};
        double width{1};
        double height{1};
        static int object_count;
};

#endif // BOX_H

Box.cpp文件

#include "Box.h"
#include <iostream>

using namespace std;

int Box::object_count {};

Box::Box()
{
    cout<<"no index construction function"<<endl;
    //默认的无参构造函数一旦指定，就不会额外创建
    ++object_count;
    cout<<"object_count="<<object_count<<endl;
}

Box::Box(double side):Box(side,side,side,side)
{
    cout<<"beg construction function"<<endl;
    ++object_count;
}


Box::Box(double lv,double wv,double hv,double n):length{lv},width{wv},height{hv}
{
    cout<<"three index construction function"<<endl;
    ++object_count;
}
Box::Box(int i,int j){
    cout<<"int construction function"<<endl;
    ++object_count;
}

void Box::test(){
    cout<<"test"<<endl;
}

double Box::volume(){
    return length*width*height;
    cout<<"??"<<endl;
}

int Box::get_count(){
    return object_count;
}

刚开始我试着加入静态数据成员object_count,报错找不到get_count()函数，于是加入了test()函数进行测试，保存编译后仍然没用，报错如下：

-------------- Build: Debug in Class_review (compiler: GNU GCC Compiler)---------------

g++ -Wall -fexceptions -g -Iinclude -c /home/tianrui/workspace/C++/Beginning_Learn/Class_review/main.cpp -o obj/Debug/main.o
/home/tianrui/workspace/C++/Beginning_Learn/Class_review/main.cpp: In function ‘int main()’:
/home/tianrui/workspace/C++/Beginning_Learn/Class_review/main.cpp:11:10: error: ‘class Box’ has no member named ‘test’
box1.test();
^~~~
Process terminated with status 1 (0 minute(s), 0 second(s))
1 error(s), 0 warning(s) (0 minute(s), 0 second(s))

我测试了很多次，更改Box.cpp与Box.h文件后Rebulid根本毫无反应！！
target里明明都选上了。。