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                            i:input(輸入(讀取))
o:output(輸出(寫入))
 流:數據(字符,字節)1個字符 =2個字節 1個字節 =8個二進制位
|     | 輸入流  |輸出流  |
| --- | --- | --- |
|    字節流 |  字節輸入流InputStream   |  字節輸出流OutputStream   |
|   字符流  |  字符輸入流Reader   |  字符輸出流Writer  |

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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