文件操作（10）高级流之DataInputStream、DataOutputStream

• 继承父类FilterInputStream
• 优点：可以读写基本数据

        DataOutputStream bos = new DataOutputStream(new FileOutputStream("A.txt"));
        bos.writeInt(13123);
        bos.writeDouble(3.11);
        bos.writeBoolean(true);
        bos.writeByte('a');
        bos.writeUTF("哈哈哈");
        DataInputStream bis = new DataInputStream(new FileInputStream("A.txt"));
        System.out.println(bis.readInt());
        System.out.println(bis.readDouble());
        System.out.println(bis.readBoolean());
        System.out.println(bis.readByte());
        System.out.println(bis.readUTF());
        bis.close();
        bos.close();