1强制类型转换一般不推荐使用，因为有可能发生精度损失，数据溢出
byte/short/char 三中类型都可以发生数学运算，在运算时，都会被首先提升成int类型，然后再进行运算
boolean类型不能发生数据类型转换
计算机的底层会用一个数字（二进制）来代表字符A，就是65.一旦开始数学运算，字符就会按照一定规则翻译成一个数字
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- Java基础课件下载
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- day01.复习简单方法的使用....
- day02.方法的定义格式.fl...
- day03.方法的三种调用格式....
- day04.方法的调用流程图解....
- day05.对比有参数和无参数....
- day06.方法练习1_比较两个...
- day07.方法练习2_求出1到...
- day08.方法练习3_打印指定...
- day09.对比有返回值和无返回...
- day10.方法的注意事项.fl...
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- day01.jdk9的JShel...
- day02.编译器的两点优化.f...
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- day05.三种循环的区别.fl...
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- day07.循环控制_conti...
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