有一个错误不知道怎么改了，求大神帮助

//这是我的定义的类

package com.imooc;

public class FangFa {

private float screen;

private float cpu;

private float mem;

public float getScreen(){

return screen;

}

public void setScreen(float newScreen){

screen=newScreen;

}

public FangFa(){

System.out.println("无参的构造方法执行了！");

}

public FangFa(float newScreen,float newCpu,float newMem){

screen=newScreen;

   cpu=newCpu;

   mem=newMem;

   System.out.println("有参的构造方法执行了！");

}

}

//这是主函数

package com.imooc;

public class FZ {

public static void main(String[] args) {

// TODO Auto-generated method stub

FangFa hello=new FangFa();

FangFa hi=new FangFa(5.0f,1f,2.0f);

}

hi.setScreen(6.0f);

System.out.println("screen:"+hi.getScreen());

}

然后有一个错误不知道怎么改了