我有一个用java 8编写的代码，使用completablefuture和handle方法：

public interface Move
{
   CompletableFuture<Boolean> move(float i);
}

然后创建move的示例mover并调用：

mover.move(i).handle(new BiFunction<Boolean, Throwable, Object>()
{
   public Object apply(Boolean b, Throwable err)
   {
      return something; //Didn't want to overwhelm the code here; in the original one a method is called
   }
}

如何使它与java7向后兼容？或者我该如何处理这个问题？