public class Test01{
public static void main(String[] args){
int a = 1;
int b = a++;//++在后,则先把a的值赋给b,然后a再自加1,这段代码执行后,b=1,a=2
int c = ++a;//++在前,先a自加1,然后赋值给c,这段代码执行后,a= 3,c=3
int x = 1;
int y = 2;
int t;
//实现x与y的值互换 t = y; y = x; x = t; System.out.println("a="+a);//3 System.out.println("b="+b);//1 System.out.println("c="+c);//3 System.out.println("x="+x); System.out.println("y="+y); }
}