Question

In Java please.

2. Create a stack class MyStack2 that extends ArrayList. Write a test program that reads a number of strings from the user then displays them in reverse order.

3. Modify your code in (2) so that MyStack become a generic class (i.e. MyStack).

Answer 1

Thanks for the question. Below is the code you will be needing. Let me know if you have any doubts or if you need anything to change.

If you are satisfied with the solution, please rate the answer. Let me know for any help with any other questions.

Thank You !
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import java.util.ArrayList;

public class MyStack2 extends ArrayList {

public void push(String word) {
this.add(word);
}

public String pop() {
if (size() != 0) {
String lastElement = (String) get(size() - 1);
remove(size() - 1);
return lastElement;
} else {
return null;
}
}

public boolean isEmpty() {
return size() == 0;
}

}

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// TestProgram.java
public class TestProgram {

public static void main(String[] args) {

MyStack2 myStack2 = new MyStack2();

myStack2.push("Apple");
myStack2.push("Banana");
myStack2.push("Cherry");
myStack2.push("Daisy");

while (!myStack2.isEmpty()){
System.out.println(myStack2.pop());
}
}
}
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// Part 3
import java.util.ArrayList;

public class MyStack2<T> extends ArrayList<T> {

public void push(T word) {
this.add(word);
}

public T pop() {
if (size() != 0) {
T lastElement = (T) get(size() - 1);
remove(size() - 1);
return lastElement;
} else {
return null;
}
}

public boolean isEmpty() {
return size() == 0;
}

}

// TestProgram for Part 3
public class TestProgram {

public static void main(String[] args) {

MyStack2<Integer> myStack2 = new MyStack2();

myStack2.push(10);
myStack2.push(20);
myStack2.push(30);
myStack2.push(40);
myStack2.push(50);

while (!myStack2.isEmpty()){
System.out.println(myStack2.pop());
}
}
}
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