一、注释
单行注释 //
多行注释/* */
文档注释
二、关键字
class等
三、字面量
特别注意:
1、字符串类型和字符类型的区别
2、null是不能打印的,可以用字符串类型打印出来null
![](https://img.haomeiwen.com/i7096759/bb130bdfda5f3382.png)
四、特殊字面量
1、制表符'\t'
![](https://img.haomeiwen.com/i7096759/7fce415e1163730e.png)
五、变量
![](https://img.haomeiwen.com/i7096759/2bebdd8acdca7bd5.png)
int a=10,b=20;
int c=200;
五、计算机中存储知识
1、进制
![](https://img.haomeiwen.com/i7096759/09e9ddcbdf82d12a.png)
2、进制转换
(1)任意进制转十进制
![](https://img.haomeiwen.com/i7096759/5c9d4a7d81e907b2.png)
![](https://img.haomeiwen.com/i7096759/9bdc96e4902148af.png)
![](https://img.haomeiwen.com/i7096759/415488afbc2b9941.png)
(2)二进制转十进制
![](https://img.haomeiwen.com/i7096759/41c64ae605d4cbf3.png)
![](https://img.haomeiwen.com/i7096759/f90ed895ef3ab019.png)
(3)其他进制转十进制
![](https://img.haomeiwen.com/i7096759/6e546bb943216c6f.png)
(4)十进制转其他进制
![](https://img.haomeiwen.com/i7096759/79cc737546a6a5d0.png)
![](https://img.haomeiwen.com/i7096759/bff2ae27745c9db8.png)
(5)小节
![](https://img.haomeiwen.com/i7096759/d47bd4700bef5db4.png)
3、ASCII码
![](https://img.haomeiwen.com/i7096759/d642cb296d779124.png)
4、编码类型
![](https://img.haomeiwen.com/i7096759/944516df47332c10.png)
网友评论