java中的加加++的疑惑?

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/czh500/article/details/84991987

 java中的加加++的疑惑?

直接看下面的截图和代码吧

package javase;
public class Test2 {

	public static void main(String[] args) {
		int x = 8;
		//理论上来说x的初始值是8，x先赋值给x，x再自加1，此时x的值是9
		x = x++;
		//理论上此时x的值是9才对啊，可是此时打印出来x的值实际上是8，我在这里疑惑不解?
		System.out.println("x = " + x);
		/*理论上此时x的值是9，x先自加1，加完后x的值是10，然后再把10赋值给x,此时x的值理论上来说应
		 * 该是10才对，可是此时打印出来x的值实际上是9，我在这里疑惑不解?
		 */
		x = ++x;
		System.out.println("x = " + x);
		System.out.println("-----------------");
		int y = 8;
		//y的初始值是8,先把y赋值给z,此时z的值是8，y再自加1，此时内存中y的值是9
		int z = y++;
		System.out.println("y = " + y + " z = " + z);
		//此时内存中y的值是9,y先自加1，此时内存中y的值是10，再把y赋值给z,此时z的值是10
		z = ++y;
		System.out.println("y = " + y + " z = " + z);
		System.out.println("-----------------");
		int a = 66;
		//先打印a的值,a再自加上1
		System.out.println(a++);
		System.out.println(a);
		System.out.println("-----------------");
		int b = 88;
		//b先自加1，再打印b的值
		System.out.println(++b);
		System.out.println(b);
		System.out.println("-----------------");
		int number = 23;
		number = number + 2;
		System.out.println("number = " + number);
		System.out.println("-----------------");
		int age = 23;
		age = age++;
		//不明白为什么age打印出来还是23，难道不应该是24吗？谁能解释下?
		System.out.println("age = " + age);
		
		System.out.println("-----------------");
		int salary = 12666;
		salary = ++salary;
		//打印出来是12667，谁能解释下?
		System.out.println("salary = " + salary);
	}
}