Here's the problem... I want to create a table about the stack like this:
((A+B)-C)
Symbol Postfix Stack
( (
( ((
A A ((
+ A ((+
B AB ((+
) AB+ (
- AB+ (-
C AB+C (-
) AB+C-But i don't know how to read the input from the user... (The Characters)
Example ((A+B)-C) : I want to get the '(' and the rest
//An incomplete code
//---------------------------------------------------------------------------------------
import java.util.*;
public class Stack2<Item> implements Iterable<Item> {
Scanner kbd = new Scanner(System.in);
private int N;
private Node first;
private class Node {
private Item item;
private Node next;
}
public Stack2() {
first = null;
N = 0;
}
public boolean isEmpty() {
return first == null;
}
public int size(){
return N;
}
public Item peek() {
return first.item;
}
public void push(Item item) {
Node oldfirst = first;
first = new Node();
first.item = item;
first.next = oldfirst;
N++;
}
public Item pop() {
if (isEmpty()) throw new RuntimeException("Stack underflow");
Item item = first.item;
first = first.next;
N--;
return item;
}
public Iterator<Item> iterator() {
return new StackIterator();
}
private class StackIterator implements Iterator<Item> {
private Node current = first;
public boolean hasNext() {
return current != null;
}
public void remove() {
throw new UnsupportedOperationException();
}
public Item next() {
if (!hasNext()) throw new NoSuchElementException();
Item item = current.item;
current = current.next;
return item;
}
}
public static void main(String[] args){
Stack<String> stack = new Stack<String>();
}
}