ByteArrayInputStream:是把字節數組當成源的輸入流

    String string="hello shanghai";
    ByteArrayInputStream bis=new ByteArrayInputStream(string.getBytes());
    int data=-1;
    while ((data=bis.read())!=-1) {
        System.out.print((char)data);
        
    }
    //bis.close();

ByteArrayInputStream:是把字節數組當做目標的輸出流

ByteArrayOutputStream bos=new ByteArrayOutputStream();
     bos.write(97);
     bos.write("hello world".getBytes());
     byte[] buff=bos.toByteArray();
     for(byte data:buff) {
         System.out.println((char)data);
     }
     
     FileOutputStream fos=new FileOutputStream("D:\\aa.txt",true
 
);
     bos.writeTo(fos);//把 ByteArrayOutputStream內部緩沖區的數據寫到對應的文件輸出流中
     fos.close();

(五)IO流之ByteArrayInput/OutputStream