Difference between a += 10 and a = a + 10 in java? [duplicate]

Answer 1

There are some terminologies in S/W field, I can explain this to you,

in a=a+1 assignment for a is measured after two steps

1. System calculates the value of a (a new isolated copy is created here)
2. System add 10 to isolated variable a then the value of isolated a is assigned to left side a

But in second case,

1. System knows the value of a and directly add 10 to a (no isolated copy has been made here).

Hope this will be helpful to you, and one more thing, we usually use method that is a += 10; because it reduce the cost of operation, as per others one,