Prinzip des Interpreters

switch ( opcode[ pc++ ] ) {
case NOP:         nop();         break;
case ACONST_NULL: aconst_null(); break;
case ICONST_NULL: iconst_m1();   break;
...
case IFNONNULL:   ifnonnull();   break;
case GOTO_W:      goto_w();      break;
case JSR_W:       jsr_w();       break;
default: unknown_opcode();
}