Java List Node Error :(

Question

hi, I am currently trying to make a list method that takes in random numbers and puts them in numeric order from smallest to largest. Smallest at the head. I can not figure out what my problem is, but I am hitting a memory error and I do not know why. Can you look at it and maybe give me an idea of what I am doing wrong? thanks
public void insert(int freq) // This method is putting list in order from smallest to...
{                              // largest. Smallest at the "head."
curr = head; // Sets "curr" to the beginning of the list
if ( head == null ) // Checks to see if list is empty
head = new Node ( freq, null ); //If empty, creates sentinel node, and makes...
head = new Node ( freq, head ); // "head" have temporary unimportant values
tail = head.next; // Sets tail to the last node
else
if ( freq > tail.num() ) // Checks to see if number is largest number in list...
// because tail should be theoretically largest number
tail.next = new Node ( freq, tail.next); // If largest, makes new node tail.
else // If not largest, than go through list and find proper spot
while ( curr.next != null ) // runs through list until end of list
if ( freq <= curr.next.num ) // puts numbers BEFORE numbers larger than it
curr.next = new Node ( freq, curr.next );
curr = curr.next; // increments towards end of list
}

Answer 1

im pretty new but maybe this will help if its a problem with the logic this is just a snipet of code for a simple
sort were the array is filled with random numbers
// this below will sort it dont need it though
for ( v = 0; v < loop_regulator; v++ ){
for ( j = 0 ; j < v; j++ ) {
if( inputed_array[j] > inputed_array[v] ) {
dummyvar1 = inputed_array[v] ;
dummyvar2 = inputed_array[j] ;
inputed_array[v] = dummyvar2 ;
inputed_array[j] = dummyvar1 ;
}//end if
} //end j
} // end v