+= in java

int x = 10;

x += 10; // x = x + 10; i.e. x = 20

x =+ 5; // Equivalent to x = +5, so x = 5.

Source: stackoverflow.com

+= operator casting in java

    int x = 0;
    x += 1.1;    // just fine; hidden cast, x == 1 after assignment
    x = x + 1.1; // won't compile! 'cannot convert from double to int'

Source: stackoverflow.com

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