Which of the following can be used to replace YYYYYYYY in the following code? public class WildCardDemo{ public static void main(String[] args) { GenericStack stack1 = new GenericStack<>(); GenericStack stack2 = new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2); } public static void add(GenericStack stack1,GenericStack stack2) { while (!stack1.isEmpty()) stack2.push(stack1.pop()); } Select one: O a. ? extends Object b. ? extends T c. ? super T
Which of the following can be used to replace YYYYYYYY in the following code? public class WildCardDemo{ public static void main(String[] args) { GenericStack stack1 = new GenericStack<>(); GenericStack stack2 = new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2); } public static void add(GenericStack stack1,GenericStack stack2) { while (!stack1.isEmpty()) stack2.push(stack1.pop()); } Select one: O a. ? extends Object b. ? extends T c. ? super T
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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![Which of the following can be used to replace YYYYYYYY in the following code?
public class WildCardDemo{
public static void main(String[] args) {
GenericStack<String> stack1 = new GenericStack<>();
GenericStack<Object> stack2 = new GenericStack<>();
stack2.push("Java");
stack2.push(2);
stack1.push("Sun");
add(stack1, stack2);
}
public static <T> void add(GenericStack<T> stack1,GenericStack<YYYYYYYY> stack2) {
while (!stack1.isEmpty())
stack2.push(stack1.pop());
}
}
Select one:
a. ? extends Object
b. ? extends T
c. ? super T](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F09f2e31a-666c-489f-8b67-d5dd00ad1d17%2F9f54f9c5-ff1d-4a9c-a074-ef8935359805%2F4kuf4g_processed.png&w=3840&q=75)
Transcribed Image Text:Which of the following can be used to replace YYYYYYYY in the following code?
public class WildCardDemo{
public static void main(String[] args) {
GenericStack<String> stack1 = new GenericStack<>();
GenericStack<Object> stack2 = new GenericStack<>();
stack2.push("Java");
stack2.push(2);
stack1.push("Sun");
add(stack1, stack2);
}
public static <T> void add(GenericStack<T> stack1,GenericStack<YYYYYYYY> stack2) {
while (!stack1.isEmpty())
stack2.push(stack1.pop());
}
}
Select one:
a. ? extends Object
b. ? extends T
c. ? super T
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