[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繼承了Map，但沒有實現entrySet()方法（該方法還是abstract修飾），如果要繼承AbstractMap，需要自己實現entrySet()方法。沒有真正實現put(Kkey, V value)方法，這里“沒有真...[全文]
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