Reference concept:
If a variable represents an array, such as a, we have a known reference
to the different basic types
int c = 5; c is called to assign to 5
declare a reference to int [] a;
a = new new int [5];
let a reference to this, points to an array
JAVA based learning - the concept of reference
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Origin www.cnblogs.com/leemlzm/p/12044471.html
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