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70 lines (63 loc) · 847 Bytes
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package stackop;
public class link {
static class node
{
int info;
node next;
public node(int info)
{
this.info=info;
next=null;
}
}
static class Stack{
public static node head;
public static boolean isEmpty()
{
return head==null;
}
public static void push(int info)
{
node newnode=new node(info);
if(isEmpty())
{
head=newnode;
}
else {
newnode.next=head;
head=newnode;
return;
}
}
public static int pop()
{
if(isEmpty())
{
return -1;
}
int top=head.info;
head=head.next;
return top;
}
public static int peek()
{
if(isEmpty())
{
return -1;
}
return head.info;
}
}
public static void main(String[] args) {
Stack s=new Stack();
s.push(1);
s.push(2);
s.push(3);
s.push(4);
while(!s.isEmpty())
{
System.out.println(s.peek());
s.pop();
}
}
}