【2014-11-23】《The Hardware/Software Interface》

Data in Java

Java has pointers – they are called ‘referenes’
Null is typically represented as 0
Characters and strings
- Two-byte Unicode instead of ASCII
  - Represents most of the world’s alphabets
- String not bounded by a ‘\0’(null character)
  - Bounded by hidden length field at beginning of string
Arrays
- Every element initialized to 0
- Bounds specified in hidden fields at start of array(int – 4 bytes)
  - array.length return value of this field
- Every access trigger a bounds-check
  - code is added to ensure the index is within bounds
  - Exception if out-of-bounds
Data structures (Object) in Java
- Objects can only include primitive data types
  - include complex data types(arrays, other objects, ec.) using references
Pointers/References
- Pointers in C can point to any memory address
- References in Java can only point to an object
  - And only to its first element – not to the middle of it
- In Java, all variables are reference to objects
  - use r.a notation
- Casting in C
  - we can cast any pointer into any other pointer
- Casting in Java
  - can only cast compatible object references
- Java Methods
  - Methods in Java are just functions but with an extra argument: a reference to the object whose method is being called
Vitual machine and runtime environment

转载于:https://www.cnblogs.com/sjtujoe/p/4116764.html

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【2014-11-23】《The Hardware/Software Interface》– Section 11

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