JoJo questions

• why BytesWritable.setSize(size) make the space of bytes to 1.5*size?
• In java, why the byte type can use &0xff to do the unsigned right shift operation?
• Use unique pointer or stack variable as class member?
• Does C++ 11 support template class reflection?
• Does a string hash exist which can ignore the order of chars in this string
• what does that mean for Text.hashCode() & Interger.MAX_VALUE?
• What's the difference between System.getProperty("java.class.path") and getClassLoader.getURLs()?
• How many memory copies do object variables in Python have? [duplicate]
• Why can the private member of an nested class be accessed by the methods of the enclosing class? [duplicate]

JoJo answers