Java - Order of Operations - Using Two Assignment Operators in a Single Line

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Happy的楠姐
Happy的楠姐 2020-12-01 23:43

What are the order of operations when using two assignment operators in a single line?

public static void main(String[] args){
    int i = 0;
    int[] a = {         


        
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  •  一生所求
    2020-12-02 00:21

    = is parsed as right-associative, but order of evaluation is left-to-right.

    So: The statement is parsed as a[i] = (i = 9). However, the expression i in a[i] is evaluated before the right hand side (i = 9), when i is still 0.

    It's the equivalent of something like:

    int[] #0 = a;
    int #1 = i;
    int #2 = 9;
    i = #2;
    #0[#1] = #2;
    

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