java-simple-tutoring/Task_54.java at master · leolnid/java-simple-tutoring · GitHub

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importjava.util.ArrayList;
importjava.util.Scanner;

publicclassTask_54 {
publicstaticclassSteck {
privateArrayList<Integer> steck = newArrayList<>();

publicvoidpush(intn) {
steck.add(n);
System.out.println("ok");
 }

publicvoidpop() {
System.out.println(steck.remove(steck.size() - 1));
 }

publicvoidback() {
System.out.println(steck.get(steck.size() - 1));
 }

publicvoidsize() {
System.out.println(steck.size());
 }

publicvoidclear() {
steck = newArrayList<>();
System.out.println("ok");
 }

publicvoidexit() {
System.out.println("bye");
 }
 }

publicstaticvoidmain(String[] args) {
Steckst = newSteck();
Scanners = newScanner(System.in);

Stringe = s.next();

while (!e.equals("exit")) {
switch (e) {
case"push" :
st.push(s.nextInt());
break;
case"pop" :
st.pop();
break;
case"back" :
st.back();
break;
case"size" :
st.size();
break;
case"clear" :
st.clear();
break;
 }
e = s.next();
 }
st.exit();
 }
}