Program doesnt work, tried to make it into array list

Question

I tried to change this from an array to arraylist and all i got was allot of errors! i was wondering if anyone could help?
import java.util.*;
import chn.util.*;
public class final_proj
public void quicks(int first, int last);
int g = first, h = last;
ArrayList myArrayList = new ArrayList();
int midIndex = (first + last) / 2;
int dividingValue = list[midIndex];
do
while (list.get(g) < dividingValue)
g++;
while (list.get(h) > dividingValue)
h--;
if (g <= h)
//swap(list[g], list[h]);
int temp = list.get(g);
list.get(g) = list.get(h);
list.get(h)= temp;
g++;
h--;
while (g < h);
if (h > first)
quickSort (list,first,h);
if (g < last)
quickSort (list,g,last);
//not offering money
ERRORS
\\ls-server\userdata\08jleslie\Java\MyProjects\final_proj.java:5: missing method body, or declare abstract
public void quicks(int first, int last);
^
\\ls-server\userdata\08jleslie\Java\MyProjects\final_proj.java:9: cannot resolve symbol
symbol : variable first
location: class final_proj
int g = first, h = last;
^
\\ls-server\userdata\08jleslie\Java\MyProjects\final_proj.java:9: cannot resolve symbol
symbol : variable last
location: class final_proj
int g = first, h = last;
^
\\ls-server\userdata\08jleslie\Java\MyProjects\final_proj.java:13: cannot resolve symbol
symbol : variable first
location: class final_proj
int midIndex = (first + last) / 2;
^
\\ls-server\userdata\08jleslie\Java\MyProjects\final_proj.java:13: cannot resolve symbol
symbol : variable last
location: class final_proj
int midIndex = (first + last) / 2;
^
The system is out of resources.
Consult the following stack trace for details.
java.lang.OutOfMemoryError

Answer 1

import java.util.*;
import chn.util.*;
public class Test
public void quicks(int first, int last)
int g = first, h = last;
ArrayList myArrayList = new ArrayList();
int midIndex = (first + last) / 2;
int dividingValue = list[midIndex];
     do
          while (list.get(g) < dividingValue)
               g++;
          while (list.get(h) > dividingValue)
          h--;
          if (g <= h)
               //swap(list[g], list[h]);
               int temp = list.get(g);
               list.get(g) = list.get(h);
               list.get(h)= temp;
               g++;
               h--;
while (g < h);
     if (h > first)
          quickSort (list,first,h);
     if (g < last)
          quickSort (list,g,last);
}An improvement but still doesn't compile because.
1). import chn.util.*; ???
2). int dividingValue = list[midIndex]; makes no sinse.
3). Variable list is never declared.