Why it's displays error I can't find it. Can you explain me in detail? Why it's happening?

Question

import java.util.*;

class stack {
public static void Push(int top, int[] stack) {
Scanner sc = new Scanner(System.in);
if (top == stack.length - 1) {

System.out.println("Stack Overflow");
System.exit(1);
} else {
System.out.println("Pushed element in Stack: ");
int n = sc.nextInt();
++top;
stack[top] = n;
}
sc.close();
}

public static void Pop(int top, int[] stack) {
if (top == -1) {
System.out.println("Stack Empty");
System.exit(1);
} else {
int item = stack[top];
top--;
System.out.println("Deleted item: " + item);
}
}

public static void Disp(int top, int[] stack) {
if (top == -1) {
System.out.println("Stack Empty");
} else {
for (int a : stack) {
System.out.println(a);
System.out.println();
}

Answer 1

Why do you tag Python when it is Java?

Which error do you get?

Link your code, so people can test it.

Answer 2

- keep System.in opened,
if you close it, (by sc.close() ) it is imposible read it again !

- also if you change the int variable 'top' inside methods push(), pop(),
it does not affect the 'top' outside the methods (in main() )

rest of code:
System.out.println("Unknown command " +choice);
}
// test
System.out.println( Arrays.toString(stack));
System.out.println( "top="+top);
}
}
}

Answer 3

Lisa

PS S:\Java_DSA> javac stack.java
PS S:\Java_DSA> java stack

Enter size of stack: 4
Enter your choice:
1. Push
2. Pop
3. Display
4. Exit
Enter your choice:
1
Pushed element in Stack:
Exception in thread "main" java.util.NoSuchElementException
at java.base/java.util.Scanner.throwFor(Scanner.java:945)
at java.base/java.util.Scanner.next(Scanner.java:1602)
at java.base/java.util.Scanner.nextInt(Scanner.java:2267)
at java.base/java.util.Scanner.nextInt(Scanner.java:2221)
at stack.Push(stack.java:12)
at stack.main(stack.java:63)