public class exam{
        public static void main(String args[]){
            int x,y,z;
            x=1;
            y=2;
            z=3;
            x+=y;
            y%=x;
            z/=x;   
            System.out.print("\tx="+(x+=y));
            System.out.print("\ty="+y);
            System.out.print("\tz="+z);
}
}
编译出来结果是
X=5   y=2   z=1
和自己算的不一样 自己算的是
x=3   y=0    z=3

            x=1;  
            y=2;
            z=3;
            x+=y;  //x=x+y > x=3
            y%=x;  //y=y%x y=2%3 > y=2
            z/=x;  //z=z/x  z=3/3 > z=1
            System.out.print("\tx="+(x+=y)); //x=x+y 3+2 > x=5
            System.out.print("\ty="+y);
            System.out.print("\tz="+z);

结果 5 2 1

想和你说下关于System.out.println();函数的使用
看看
楼上正解
int x =1,y=2;
System.out.println(""+x+y);
System.out.println(x+""+y);
自己回去试一试啊

int x =1,y=2;

 System.out.println(x+y+"");

测试下吧

谢谢 各位了  我已经明白了