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Copy pathStackLL.java
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83 lines (48 loc) · 1.05 KB
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package stacks;
class NodeLL<T> {
T data;
NodeLL<T> next;
public NodeLL(T data) {
this.data = data;
}
}
class StackEmptyException extends Exception{
}
public class StackLL<T>{
private NodeLL<T> head;
private int size;
public StackLL() {
size=0;
head=null;
}
public int size() {
return size;
}
public void push(T data) {
NodeLL<T> newNodeLL=new NodeLL<T>(data);
if(head==null){
head=newNodeLL;
}
newNodeLL.next=head;
head=newNodeLL;
size++;
}
public boolean isEmpty() {
return size==0;
}
public T pop() throws StackEmptyException {
if(head==null){
throw new StackEmptyException();
}
T data=head.data;
head=head.next;
size--;
return data;
}
public T top() throws StackEmptyException {
if(head==null){
throw new StackEmptyException();
}
return head.data;
}
}