✎ javacard:jcvm:2.2.4.6_class_initialization [wiki]

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=== 2.2.4.6 Class Initialization ===

The Java Card virtual machine contains limited support for class initialization because there is no general mechanism for executing ******** methods. Support for ******** methods is limited to the initialization of static field values with the following constraints:  

 

  *Static fields of applet packages may only be initialized to primitive compile-time constant values, or arrays of primitive compile-time constants.     

  *Static fields of user libraries may only be initialized to primitive compile-time constant values.     

  *Only static fields declared in the current class may be initialized in the **** method.    

Primitive constant data types include **boolean**, **byte**, **short**, and **int**. 

Given Java technology source files that adhere to these language-level constraints on static field initialization, it is expected that reasonable Java compilers will: 

 

  *Inline constants in the bytecodes that reference static final primitive fields that are initialized in the declaration statement.    

  *Produce only the following bytecodes:     

  *load a value on the stack: **iconst_[m1,0-5]**, **[b|s]ipush, ldc, ldc_w, aconst_null**    

  *create an array: **newarray([byte|short|boolean|int]** )    

  ***dup**licate items on the stack: **dup**    

  *store values in arrays or static fields: **[b|i|s]astore, putstatic**    

  ***return** from method: **return**

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