目录认识OptionalOptional对象创建Optional.get()方法(返回对象的值)Optional.isPresent()方法(判读是否为空)Optional.ifPresent()方法(判读是否为空并返回函数)Optional.filter()方法(过滤对象)Optional.flatMap()方
private int[, ,] table = new int[4 , 5 , 5]{ {{0,6,2,6,4},{2,2,4,2,8},{4,4,8,4,6},{6,6,2,6,4},{8,8,6,8,2}},