DSA/Stack1.java at master · ANNAPAVAN/DSA · GitHub

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importjava.util.*;
classStack1
{
staticScannersc=newScanner(System.in);
staticNodetop;
staticclassNode
 {
intdata;
Nodenext;
Node(intd)
 {
data = d;
next = null;
 }
 }
publicstaticvoidisEmpty(Stack1s)
 {
if(top==null)
 {
System.out.println("empty");
 }
else
 {
System.out.println("not empty");
 }
 }
publicstaticvoidpeek(Stack1s)
 {
if(top!=null)
 {
System.out.println(top.data);
 }
else{
System.out.println("empty");
 }
 }
publicstaticvoidpush(intd)
 {
Noden = newNode(d);
if(top==null)
 {
top = n;
 }
else
 {
n.next = top;
top = n;
 }
 }
publicstaticvoidpop()
 {
if(top==null)
 {
System.out.println("empty");
return;
 }
top = top.next;
 }
publicstaticvoiddisplay(Stack1s)
 {
Nodetemp = top;
while(temp!=null)
 {
System.out.print(temp.data+" ");
temp = temp.next;
 }
 }
publicstaticvoidmain(String[] pavan)
 {
Stack1s1 = newStack1();
push(10);
push(20);
push(30);
display(s1);
peek(s1);
isEmpty(s1);
pop();
pop();
pop();
pop();
pop();
 }
}