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public class SLL<T> extends EXP6_47 {
private EXP6_47 head, tail;
public SLL(){
head=tail=null;
}
public boolean Empty1(){
if(head==null){
System.out.println("List is EMPTY");
}
else if (head != null){
System.out.println("List is not EMPTY");
}
return head==null;
}
public boolean Empty(){
return head==null;
}
public void AddHead(T el){
head = new EXP6_47<T>(el,head);
if(tail==null)
tail=head;
}
public void AddTail(T el){
if(Empty()){
head=tail=new EXP6_47<T>(el);
}
else{
tail.next=new EXP6_47<T>(el);
tail=tail.next;
}
}
public T RemoveTail(){
if(Empty())
return null;
T el=(T) head.info;
if(head==tail)
head=tail=null;
else{
EXP6_47<T> p;
for(p=head;p.next!=tail;p=p.next);
tail=p;
tail.next=null;
}
return el;
}
public T RemoveHead(){
if(Empty())
return null;
T el = (T) head.info;
if(head==tail)
head=tail=null;
else
head = head.next;
return el;
}
public String printAll(){
EXP6_47<T> p;
String s="";
for(p=head;p!=null;p=p.next)
s=s+p.info.toString()+" ";
return s;
}
public EXP6_47<T> getNode(T el){
EXP6_47<T> p=head;
while(p!=null && p.info!=el)
p=p.next;
return p;
}
public boolean isInList(T el){
return getNode(el) !=null;
}
public void MakeNull(){
head=null;
}
public void InsertAfterNode(T el, EXP6_47 <T> ptr){
if(ptr !=null){
if(tail==ptr)
AddTail(el);
else
ptr.next = new EXP6_47<T>(el,ptr.next);
}
}
public void InsertAfterElt(T elOld,T elNew){
EXP6_47<T> p;
p = getNode(elOld);
if(p!=null)
InsertAfterNode(elNew, p);
}
public EXP6_47<T> getNodeb(T el){
EXP6_47<T>p=head,r=head.next;
for(p=head,r=head.next;r!=null && r.info != el;p=p.next,r=r.next);
return p;
}
public void InsertBeforeNode(T el, EXP6_47<T> ptr){
if(ptr !=null){
if(head==ptr){
AddHead(el);
}
else{
ptr.next = new EXP6_47<T>(el,ptr.next);
} }
}
public void InsertBeforeElt(T elOld,T elNew){
EXP6_47<T> p;
p = getNodeb(elOld);
if(elOld == head.info)AddHead(elNew);
if(p!=null)InsertAfterNode(elNew,p);
}
}
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