练习（java）：关于自增运算的练习

//练习3：
byte bb1 = 127;
bb1++;
System.out.println("bb1 = " + bb1);//-128
bb1--;
System.out.println("bb1 = " + bb1);//127

//练习4：
int i3 = 1;
int j = i3++ + ++i3 * i3++;
/*
运算从左往右走，首先i3=1参与运算，得到1+
然后i3=1自增1，变为i3=2
接着i3=2前++，自增1，变为i3=3
接着i3=3参与运算，得到1+3*
然后i3=3参与运算，得到1+3*3
接着i3=3自增1，得到i3=4
*/
System.out.println("j = " + j);// j = 10
System.out.println("i3 = " + i3);// i3 = 4

//练习5
int i4 = 2;
int j2 = i4++;
System.out.println(j2);//2
//j2 = 2;i4 = 3;

int m = 2;
m = m++; //(1)先取b的值“2”放操作数栈 (2)m再自增,m=3 (3)再把操作数栈中的"2"赋值给m,m=2
System.out.println(m);