j++，是一個依賴于java里面的“中間緩存變量機制”來實現的，

++在前就是“先加后賦”(++j)

++在后就是“先賦后加”? (j++)

public class Test1 {

public static void main(String[] args) {

int i = 10;

int a = 0;

int b = 0;

int c = 0;

int d = 0;

//? a = i++ + i++; //21

/*

* temp1 = i;???????? 10

* i = i + 1;??????????? 11

* temp2 = i;???????? 11

* i = i + 1;??????????? 12

* a = temp1 + temp2 = 21;

*/

//? b = ++i + ++i; //23

/*

* i = i + 1;?????????? 11

* temp1 = i;??????? 11

* i = i + 1;?????????? 12

* temp2 = i;??????? 12

* b = temp1 + temp2 = 23;

*/

//? c = ++i + i++; //22

/*

* i = i + 1;????????????? 11

* temp1 = i;?????????? 11

* temp2 = i??????????? 11

* i = i + 1;????????????? 12

* c = temp1 + temp2 = 22

*/

d = i++ + ++i; //22

/*

* temp1 = i;?????????????? 10

* i = i + 1;????????????????? 11

* i = i + 1;????????????????? 12

* temp2 = i;?????????????? 12

* d = temp1 + temp2 = 22;

*/

System.out.println(a); ? System.out.println(b); ? System.out.println(c); ? System.out.println(d); ?} }

總結

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