Which of the following can be used to replace YYYYYYYY in the following code? public class WildCard Demo3 { public static void main(String[] args) { Generic Stack stack1 = new Generic Stack<>(); Generic Stack stack2= new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2);

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
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Answer this question regarding java:

 

Which of the following can be used to replace YYYYYYYY in the following code?
public class WildCard Demo3 {
public static void main(String[] args) {
}
}
}
GenericStack<String> stack1 = new GenericStack<>();
Generic Stack<Object> stack2 = new GenericStack<>();
stack2.push("Java");
stack2.push(2);
stack1.push("Sun");
add(stack1, stack2);
WildCard Demo2.print(stack2);
public static <T> void add(GenericStack<T> stack1,
Generic Stack<YYYYYYYY> stack2) {
while (!stack1.isEmpty())
stack2.push(stack1.pop());
? super Object
? super T
? extends T
? extends Object
Transcribed Image Text:Which of the following can be used to replace YYYYYYYY in the following code? public class WildCard Demo3 { public static void main(String[] args) { } } } GenericStack<String> stack1 = new GenericStack<>(); Generic Stack<Object> stack2 = new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2); WildCard Demo2.print(stack2); public static <T> void add(GenericStack<T> stack1, Generic Stack<YYYYYYYY> stack2) { while (!stack1.isEmpty()) stack2.push(stack1.pop()); ? super Object ? super T ? extends T ? extends Object
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