An instance of solving a subset of a set in Java

An instance of solving a subset of a set in Java

Method 1: we know the n-th power of the number of subsets 2

For example, subsets of a, B, C

* 000 0 {} *001 1 a *010 2 b *011 3 a,b (b,a) *100 4 c * 101 5 a,c (c,a) * 110 6 b,b) * 111 7 a,c

Using binary correspondence

Mode 2: induction

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