Java Programming by Pearson

800 • Java Programming

1 iload_1

2 putfield #4 // Field Example.i I

5 return

Method int getIt()

0 aload_0

1 getfield #4 // Field Example.i I

4 ireturn

As with the operands of method invocation instructions, the operands of the putfield and getfield

instructions (the constant pool index #4 ) are not the offsets of the fi elds in the class instance. The Java

compiler generates symbolic references to the fi elds of an instance, which are stored in the constant pool.

Those constant pool items are resolved at runtime to determine the actual fi eld offset.

Basically getfield and putfield are used for manipulating object ...