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86 lines (76 loc) · 1.54 KB
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Copy pathStack.java
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86 lines (76 loc) · 1.54 KB
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public class Stack {
static public class Node{
int data;
Node next;
public Node(int data) {
this.data = data;
}
}
public static Node top;
public static void push(int item) {
Node n = new Node(item);
n.next = top;
top = n;
}
public void display() {
if(top == null) {
System.out.println("Stack is Empty");
}
Node temp = top;
while(temp != null) {
System.out.print(temp.data + " ");
temp = temp.next;
}
}
public static int pop() throws Exception {
if(top == null) {
throw new Exception("Stack is Empty");
}
int poppedData = top.data;
top = top.next;
return poppedData;
}
public static int search(int element) {
int pos = 0;
Node temp = top;
while(temp.data != element) {
pos++;
temp = temp.next;
if(temp == null) {
System.out.println("Element " + element +" Not found");
return -1;
}
}
return pos;
}
public static int peek() throws Exception{
if(top == null) {
throw new Exception ("Stack is Empty.");
}
else {
return top.data;
}
}
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
Stack stack = new Stack();
stack.push(10);
stack.push(20);
stack.push(30);
stack.push(40);
stack.display();
System.out.println();
System.out.println(stack.pop());
stack.display();
System.out.println();
System.out.println(stack.peek());
stack.pop();
stack.pop();
stack.display();
stack.pop();
stack.display();
stack.push(20);
stack.display();
System.out.println(stack.search(2));
}
}