자바 바이트 흐름 출력 흐름 FileOutputStream 및 흐름 이상 처리

https://docs.oracle.com/javase/8/docs/api/org/omg/CORBA/portable/OutputStream.html

	/**
	 * OutputStream:   ,        ,    
	 * 	write(int b)       
	 * 	write(byte[] b)        
	 * 	write(byte[] b,int,int),      ,int,    ,int,      
	 * 	fulsh();          ,               ,           
	 * 	close();   ,                  ,           
	 * 	
	 *    :FileOutputStream,                   
	 *     
	 * FileOutputStream("D:\\a.txt");
	 * FileOutputStream(File file);
	 * FileOutputStream("D:\\a.txt",true);true:            
	 * FileOutputStream(File file,true);true:            
	 */
	public static void main(String[] args) throws IOException {
		//writeFile();
		//keepWriteFile();
		getException();
	}
	/**
	 *       
	 * 	             ,         ,                   ,U        ....
	 */
	private static void getException() {
		FileOutputStream fos = null;//       
		try {
			//                ,    catch,    close()  try       ,  finally             
			fos = new FileOutputStream("D:\\a.txt");
			fos.write("Hello".getBytes());
		} catch (IOException e) {
			throw new RuntimeException("      !     :
"+e.getMessage());
		}finally{
			try {
				if(fos != null)//              
					fos.close();
			} catch (IOException e) {
				throw new RuntimeException("      !     :
"+e.getMessage());
			}
		}
	}
	/**
	 *        
	 *     FileOutputStream(File file,true)  FileOutputStream("D:\\a.txt",true);   
	 *     \r

	 */
	private static void keepWriteFile() throws IOException {
		File file = new File("D:\\a.txt");
		FileOutputStream fos = new FileOutputStream(file,true);//              true,   false
		fos.write("Hello".getBytes());
		fos.write("\r
World".getBytes());
		fos.close();
		System.out.println("    ");
	}


	/**
	 *     
	 */
	private static void writeFile() throws IOException {
		//         ,          ,          ,           
		FileOutputStream fos = new FileOutputStream("D:\\a.txt");
		//     
		// fos.write(100);//     d,             ASCLL      
		//     100     ASCLL      
		/*
		 * fos.write(49); fos.write(48); fos.write(48);
		 */
		//   byte  
		byte[] b = { 65, 66, 67, 68, };
		// fos.write(b);
		// fos.write(b,1,2);

		//      
		fos.write("Hello".getBytes());

		fos.close();
		System.out.println("    ");
	}