Answered Essay: P-3.37 Write a class that maintains the top ten scores for a game application, implement ing the add and remove methods of Section 3.1.1, but using a singly

P-3.37 Write a class that maintains the top ten scores for a game application, implement ing the add and remove methods of Section 3.1.1, but using a singly linked list instead of an array.

P-3.37 Write a class that maintains the top ten scores for a game application, implement ing the add and remove methods of Section 3.1.1, but using a singly linked list instead of an array.

Expert Answer

 

JAVA CODE for node class:

public class node {

protected String Name;

protected int Score;

protected node link;

/* Constructor */

public node()

{

link = null;

Name = “”;

}

/* Constructor */

public node(String s,int d,node n)

{

Name=s;

Score = d;

link = n;

}

/* Function to set link to next Node */

public void setLink(node n)

{

link = n;

}

/* Function to set Score to current Node */

public void setScore(int d)

{

Score = d;

}

 

/* Function to set Name to current Node */

public void setName(String s)

{

Name=s;

}

/* Function to get link to next node */

public node getLink()

{

return link;

}

 

public void removeLink()

{

link=null;

}

/* Function to get Score from current Node */

public int getScore()

{

return Score;

}

 

/* Function to get Name from current Node */

public String getName()

{

return Name;

}

}

JAVA CODE for linked _list class:

public class lnked_list {

protected node start;

public int size ;

/* Constructor */

public lnked_list()

{

start = null;

size = 0;

}

/* Function to check if list is empty */

public boolean isEmpty()

{

return start == null;

}

/* Function to get size of list */

public int getSize()

{

return size;

}

/* Function to insert an element */

public void add(String s,int val)

{

node nptr = new node(s,val, null);

size++ ;

if(start == null)

{

start = nptr;

}

else

{

if(val>start.getScore())

{

node temp = start;

nptr.setLink(temp);

start=nptr;

}

else

{

node q =null;

node ptr = start;

while(val<ptr.getScore() && ptr.getLink()!=null)

{

q=ptr;

ptr = ptr.getLink();

 

}

 

 

nptr.setLink(ptr);

if(q!=null) q.setLink(nptr);

else {

start = nptr;

}

 

}

 

}

 

}

 

/*Function to remove an element*/

public void remove(String s,int val)

{

 

if(start == null)

{

return;

}

else

{

size– ;

if(start.getLink()==null && start.getScore()==val && start.getName().compareTo(s)==0)

{

start = null;

}

else

{

if(start.getScore()==val && start.getName().compareTo(s)==0)

{

start=start.getLink();

}

else

{

node q =null;

node ptr = start;

while(val<ptr.getScore() && ptr.getLink()!=null)

{

q = ptr;

ptr = ptr.getLink();

}

if(ptr.getScore()==val && ptr.getName().compareTo(s)==0)

{

q.setLink(ptr.getLink());

}

else

{

return;

}

 

}

 

}

 

}

}

 

/* Function to display elements */

public void display()

{

System.out.print(“nTOP GAME SCORES n”);

if (size == 0)

{

System.out.print(“emptyn”);

return;

}

int cnt=1;

if (start.getLink() == null)

{

System.out.println(cnt+”t”+start.getName()+”t”+start.getScore());

return;

}

node ptr = start;

while (ptr.getLink() != null && cnt<10)

{

System.out.println(cnt+”t”+ptr.getName()+”t”+ptr.getScore());

ptr = ptr.getLink();

cnt++;

}

System.out.println(cnt+”t”+ptr.getName()+”t”+ptr.getScore());

 

}

 

 

}

JAVA CODE for main():

public class top_scores {

public static void main(String[] args) {

lnked_list l=new lnked_list();

Scanner s = new Scanner(System.in);

String st = s.nextLine();

String[] parts = st.split(“, “);

int n = parts.length;

for(int i = 0;i<n;i++)

{

parts[i]=parts[i].replace(“(“, “”);

parts[i]=parts[i].replace(“)”, “”);

String[] op = parts[i].split(“,”);

 

if(op[0].compareTo(“A”)==0)

{

l.add(op[1], Integer.parseInt(op[2]));

}

else

{

l.remove(op[1], Integer.parseInt(op[2]));

}

 

}

l.display();

s.close();

}

}

OUTPUT:

 

 

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