不能从静态方法中引用非静态方法

Question

I'm trying to print my HighRights object but it wont let me..keeps saying non-static method cannot be referenced from a static method. I basically want it to print out all the values that were added ("AAA","AACCA"..etc).

import java.util.*; 

public class Ex8 {


    public void printHighUsers(ArrayList<SecurityRights> a){
       for(SecurityRights m: a)
        {
            if(m instanceof HighRights)
            {
                System.out.println(HighRights.getName());
            }
        }
    }

    public static void main(String [] a){
        ArrayList<SecurityRights> ma=new ArrayList<SecurityRights>();
        ma.add(new HighRights("AAA"));
        ma.add(new HighRights("AACCA"));
        ma.add(new HighRights("BB"));
        ma.add(new HighRights("AaaAA"));
        new Ex8().printHighUsers(ma);
    }
}

HighRights class:

public class HighRights extends SecurityRights
{
    private String name;

    public HighRights(String n){
    super(true);
    this.name = n;
   }

   public String getName(){
        return name;
    }


    public static void main(String[] a){

    HighRights s= new HighRights("Lisa");
    System.out.print(s.getName() +" "+s.getSecret());                
  }

}

Thank You.

Answer 1

In

System.out.println(HighRights.getName());

you're trying to invoke getName() statically, but it is not a static method.

What you want is

System.out.println(((HighRights) m).getName());

In other words, you need to cast your reference to HighRights so that the getName() method is accessible and invoke it on the reference, rather than statically.