Java基础13（抽象类、接口、内部类）

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Java基础12（包装类、static、代码块）

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魔术索引。在数组A [0…n-1]中，有所谓的魔术索引，满足条件A[i] = i。给定一个有序整数数组，编写一种方法找出魔术索引，若有的话，在数组A中找出一个魔术索引，如果没有，则返回-1。若有多个魔术索引，返回索引值最小的一个。

示例：

1
2
3

输入：nums = [0, 2, 3, 4, 5]
输出：0
说明: 0下标的元素为0

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