where do actual parameters in java store [duplicate]

Answer 1

All String literals go in the constant pool. The End. In this case, two constants, "stack" and "overflow", go into the pool. A new String is created that holds the same value as the "stack" in the pool, and then another String is created by concatenating the "overflow" from the constant pool to it.

Excerpt from javap -c -verbose Test:

Constant pool:
   #1 = Methodref          #10.#19        //  java/lang/Object."":()V
   #2 = Class              #20            //  java/lang/String
   #3 = String             #21            //  stack
   #4 = Methodref          #2.#22         //  java/lang/String."":(Ljava/lang/String;)V
   #5 = String             #23            //  overflow
   #6 = Methodref          #2.#24         //  java/lang/String.concat:(Ljava/lang/String;)Ljava/lang/String;