Java When outputting String and method return, why does method return output first?

Question

In the code below, if the string \"Mult\" comes before the test1(4) method call, why does the method output before the string? And why does it bounce f

Answer 1

"Mult:" + test1(4)

The above line is an expression whose value is the concatenation of "Mult:", and of the result of test1(4). So, to be able to know the result of this concatenation, test1(4) is executed. This execution prints "N:4", and then multiplies n by 2, returning 8. 8 is then concatenated with "Mult:", and the result is printed.