Implicit type casting in Java

Question

I know type casting is done automatically in Java for lower precision primitive type to higher precision. For example in this code:

int i = 20;

int j = 40;

float k = i + j;

What actually happens internally? In the third statement, do the values of i and j individually get casted to float and then added together?

Or the addition is done first in int type and then the result of the addition is casted into float?

Answer 1

They are added as ints and then cast into float because of the assignment. However, if you executed float k = (float) i + j then j would be cast to float because the left-hand side of the addition is a float. Same for float k* 1.0f*i+ j

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