int a = 10;
int b = 20;
int temp = a;
a = b;
b = temp;
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10
int a = 10;
int b = 20;
a = b + (a-(b = a));
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10
int a = 10;
int b = 20;
a=a^b; //相同则为0，不同则为1。首先判断a与b各位是否相同，将结果储存在a中bab
b=a^b; //如果a中某一位是0，则说明初始a与初始b在该位数值相同，则10-->1,00-->0，将b该位中的值保留，若a中某一位是1，说明初始a与初始b在该位数值不同，11-->0,01-->1，将b中该值取反，最终得到a的值，并赋给b
a=a^b;//此时b等于初始a的值，对其进行相同操作，若某位初始a与初始b相同则保留初始a中该位的值，若某位初始a与初始b不同，则对初始a中该位取反，使初始a的值变为初始b并赋给a
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10
int a = 10;
int b = 20;
a = a + b;
b = a - b;
a = a - b;
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10
int a = 10;
int b = 20;
a = a - b;
b = a + b;
a = b - a;
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10
int a = 10;
int b = 20;
a = a * b;
b = a / b;
a = a / b;
System.out.println("a = " + a + ",b = " + b); //a = 20,b = 10