[JAVA] Null value is entered when assigning to an array

If the initial value is not set when the array is generated There is null in the array. 【code】

String[] c = new String[4];
c[1] += 3;

[Output result] null3

To set the initial values for all the elements of the array, add the following, Null did not enter.

Arrays.fill(c, "");

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