Decrement and assignment operator in java [duplicate]

问题

This question already has answers here:

Is there a difference between x++ and ++x in java? (16 answers)

Closed 3 years ago.

Can somebody explain why output of the code below is 1.

int i = 1;
i=i--;
System.out.println(i); // 1

回答1:

i-- does the following steps:

• return the value of i
• decrement i by 1

so the statement i = i-- does the following:

• i is returned (the statement now equals i = 1)
• i is decremented (i is now 0)
• the statement (the assignment) is now done (i = 1)

In the end i is 1

---

To make it a bit more clear you could say the line i = i--; does pretty much the same as this code:

int j = i;
i = i-1;
i = j;

来源：https://stackoverflow.com/questions/35132767/decrement-and-assignment-operator-in-java