Java Handy Sticker 3

Look at the following class:

 class   Cat ( int   ID;    String name;  static  int         SID; Cat (String name) { this . Name = name ;    
 ID = sid++;  public  static  void   main (string[] args) {cat.sid  = 100;            Cat Mimi  = new  Cat ("Mimi"  = new  Cat ("Pipi" 

The allocation of memory is as follows:

1, the first line of the Main method cat.sid = 100

Because the SID is a static variable, regardless of whether the cat class created the object or not, a few objects were created, only a chunk of memory is allocated in data segment, the type is int, and the name is Sid, and the value is 100.

2, the second row new a Cat object, first allocates a piece of memory in the stack, puts the local variable Mimi, and then constructs a cat object in the heap, which has the ID and the name attribute.

String is actually a class, "Mimi" is a string constant that allocates a chunk of memory in data segment, so the Name property is a reference to "Mimi".

3, the third line to build a Cat object Pipi, in the same vein, but at this time the SID becomes 102.

The last memory allocation is as follows:

Java Handy Sticker 3