class Link {
public int iData;
public Link next;
public Link(int id) {
iData = id;
}
public String toString() {
return "{" + iData + "} ";
}
}
class LinkList {
private Link first;
public LinkList() {
first = null;
}
public boolean isEmpty() {
return (first == null);
}
public void insertFirst(int id) {
Link newLink = new Link(id);
newLink.next = first;
first = newLink;
}
public Link delete(int key) {
Link current = first;
Link previous = first;
while (current.iData != key) {
if (current.next == null)
return null;
else {
previous = current;
current = current.next;
}
}
if (current == first)
first = first.next;
else
previous.next = current.next;
return current;
}
public Link find(int key) {
Link current = first;
while (current.iData != key) {
if (current.next == null)
return null;
else
current = current.next;
}
return current;
}
public String toString() {
String str = "";
Link current = first;
while (current != null) {
str += current.toString();
current = current.next;
}
return str;
}
}
public class MainClass {
public static void main(String[] args) {
LinkList theList = new LinkList();
theList.insertFirst(22);
theList.insertFirst(44);
theList.insertFirst(66);
theList.insertFirst(88);
System.out.println(theList);
System.out.println(theList.find(22));
Link aLink = theList.delete(44);
System.out.println(theList);
}
}
{88} {66} {44} {22}
{22}
{88} {66} {22}