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                            #### 四類8種


|  八種  | 字節數   | 數據表示范圍   |
| --- | --- | --- |
|byte    |  1  | -128 ~127   |
|   short |  2  |   -32768 ~32767    |
|    int|   4 |    -2147483648 ~2147483648    |
|    long|   8 | -2^63~2^63-1    |
|    float|   4 | -3.403E38 ~3.403E38      |
|   double | 8   |    -1.798E308 ~1.798E308   |
|   char |  2  |  表示一個字符,數字表示范圍0~65535  |
|   boolean |  1  |  只有兩個值 true和false  |


#### 注意 
* 默認的整數類型是int
* 如果數字長度超出整數范圍需要在后面加L 
* 常量整數類型會自動對應相應的整數類型
* 浮點數默認類型是double
* 如果指定浮點數為float , 需要在數字后面加F 
* char取值范圍是0~65535 , 不能存儲負數 . 
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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