Notes

public boolean pair13(int[] nums) {
int count = 0;
for (int i=0; i<(nums.length-1); i++) {
if (nums[i]==13 && nums[i+1]==13) return true;
}
return false; // if we get here, there was not a pair of 13's

// note: the i loop stops one short of the full length,
// so the code can refer to nums[i+1] in the loop.
}

This new6() method makes and returns a new int array of size N that is filled with the value 6.

public int[] new6(int n) {
int[] result = new int[n];
for (int i=0; i<result.length; i++) {
result[i] = 6;
}
return result;
}


import java.util.ArrayList;

public class FriendsList
{
public static void main(String[] args)
{

/**
* Declares and initiates an ArrayList of type String.
* initially is empty
*/
ArrayList<String> friends = new ArrayList<String>();
friends.add("Vince");
friends.add("Mike"); // adds an element to the end of the list
friends.add("Matt");
friends.add("Bill");
friends.add("Dave");
friends.add("Rudy");
friends.add("Jason");
friends.add("Larry");

friends.add(1,"Lesley"); //inserting element at a slot, others move down
System.out.println(friends);

System.out.println(friends.get(0)); //returns the element at that index (Vince)

int friendsSize = friends.size();
System.out.println("I have " + friendsSize + " friends");

friends.remove(friends.size() - 1); //delete element. others are moved up
System.out.println(friends);

friends.set(2, "Michael"); //overwrites item in slot 2
System.out.println(friends);

//remove any friend whose name starts with 'M'
//friends.get(i).charAt == 'M'
// for (int i = 0; i < friends.size(); i++)
// {
// if (friends.get(i).charAt(0) == 'M')
// {
// friends.remove(i);
// i--;
// }
// System.out.println(friends);
// }
// }
//

int i = 0;
while(i < friends.size());
{
if (friends.get(i).charAt(0) == 'M')
{
friends.remove(i);
}
}
System.out.println(friends);
}
}