Something

/*
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 * and open the template in the editor.
 */
package gcode.chapter3;

/**
 *
 * @author manukaul
 */
public class MyStack {
    public Node top, minptr;
    public int min;
    public LinkList l;
    
    /* Constructor */
    public MyStack(){
        l = new LinkList();
        top = l.head;
        minptr = top;
        min = 999999; /* large value */
    }
    
    /* push */
    public void push(int d){
        l.insertAtHead(d);
        if(d < min){
            min = d;       /* Replace min */
            minptr = top;  /* Make it point to the top of stack */
        }
    }
    
    /* pop */
    public int pop(){
        return l.removeAtHead();
    }
    
    /* peek at top */
    public int top(){
        return top.data;
    }
    
    public boolean isEmpty(){
        return l.isEmpty();
    }
    
    public void displayStack(){
        System.out.println("Displaying stack...");
        l.displayList();
    }

    public int getMinimum(){
        return minptr.data;
    }
    
    
        /* Main function */
    public static void main(String[] args) {
        
        MyStack s = new MyStack();
        
        s.push(10);
        s.push(20);
        s.push(30);
        
        s.displayStack();
        
        s.pop();
        
        s.displayStack();
        
        return;
    }
}



/* OUTPUT */
Displaying stack...
displaying list
---
Displaying stack...
displaying list
---
30 20 10 20 10 BUILD SUCCESSFUL (total time: 1 second)