目录(一)同步回调(1)匿名内部类回调(2)Lambda 回调(二)异步回调(1)简单的线程回调(2)异步并行回调(3)CompletableFuture 回调小结完整代码(一)同步回调
i need to show a number to a user : 1.96666777 (timeHour) moduloformat = [NSString stringWithFormat:@\"%0.0f hours \",timeHour];