ProcessArray跟AddCommand()无法解析为类型

package A1;
public class ProcessArray {
  
   
    public static void main(String[] args) {
        ProcessArray pa = new ProcessArray();
        int [] target ={3,-4,6,4};
         pa.process(target ,new PrintCommand());
        System.out.println("------------");
        pa.process(target ,new AddCommand());
    }

    }