native.js中如何导入抽象类并重写其抽象方法

import com.landicorp.android.eptapi.device.Printer;
import com.landicorp.android.eptapi.exception.RequestException;

public class Print {
/**

• 实例化Printer的内部抽象类并重写其抽象方法,然后调用其start方法执行

• */
  public static void printContent(){
  Printer.Progress progress = new Printer.Progress() {
  @Override
  public void doPrint(Printer printer) throws Exception {
  printer.println("--------------------------------");
  printer.feedLine(8);
  }
  @Override
  public void onCrash() {

      }  
      @Override  
      public void onFinish(int code) {  
  
      }  
  
  try {  
      progress.start();  
  } catch (RequestException e) {  
      // TODO 自动生成的 catch 块  
      e.printStackTrace();  
  }  

  }
  }