Write a java program where you declare and use a Queue and a Stack. Hint: (impor

Question

Write a java program where you declare and use a Queue and a Stack. Hint: (import the stack and queue libraries) use the library methods: for a stack use push and pop, for a queue add

a) Declare a queue called “q” and load it with the integers: 10, 20, 30

b) Display the queue by printing it.

c) Remove the first node of the queue, display the queue size, display the queue head after the remove.

d) Declare a stack called “s” and load it with the integers: 100, 200, 300

e) Display the stack by printing it.

f) Remove a node from the stack, display the stack size, display the stack top after the remove.

Explanation / Answer

Stack<Integer> stack = new Stack<Integer>();
stack.push(17); // auto-boxing (int -> Integer)
int i = stack.pop(); // auto-unboxing (Integer -> int)

Integer a1 = 100;
Integer a2 = 100;
System.out.println(a1 == a2); // true

Integer b1 = new Integer(100);
Integer b2 = new Integer(100);
System.out.println(b1 == b2); // false

Integer c1 = 150;
Integer c2 = 150;
System.out.println(c1 == c2); // false

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