[摘要] Given an integern, generate a square matrix filled with elements from 1 ton2in spiral order.For example,Givenn=3,You should return the following matri[全文]
[摘要] AbstractMap:AbstractMap AbstractMap继承了Map,但没有实现entrySet()方法(该方法还是abstract修饰),如果要继承AbstractMap,需要自己实现entrySet()方法。没有真正实现put(Kkey, V value)方法,这里“没有真...[全文]