Leak filled when re-read Java instructional videos

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1. There is a default value of the variable, the random number is not defined before.

Method ###
returns the value 1. The method is independent of method overloading.

### array
1. The length of the array can not be changed during operation.
2. static initialization, the first array has a default value, then was immediately assigned.

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Origin www.cnblogs.com/chrystal/p/12318221.html