// DrJava saved history v2
// We started working with arrays today.
int time []; // DECLARE an array reference variable
time = new int[4]; // now CREATE the array - allow for four elements.
// The position of an element in an array is indicated in the index.  
// The index of the first element is 0, so the last element is n-1, 
// if the array is size n.
// The index is  identified in square brackets [] following the
// the arrray reference variable:
time[0] // what is in the first element of the array
// note that numbers in arrays are initialized to zero, and
// objects are initialized to null.
time[2] // what is in the third element of the array
time[0] = 500; // ASSIGN a value to array element at index 0
time[2] = 200;
time[3] = time[2];
time[5]
time[4]
time[3]
int time2 [] = {1,2,3,4,5,6,7}; // you can declare the array and 
                                // insert the elements this way.

int something[] = new something[1];
int something[] = new int[1]; // array of size 1

// In the following examples, we create arrays of BankAccount objects.
// You may want to retrieve a copy of the BankAccount code to run these 
// statements.
// here we declare and create an array of BankAccounts.  
BankAccount accts[] = new BankAccount[3];
accts[0] //Note that the BankAccount objects are null.
accts[1] 
accts[2] 

// assign value to the reference  accts[0], the first BankAccount
accts[0] = new BankAccount("Angie",500.00); 
accts[1] = new BankAccount("Z", 200.00);
accts[2] = new BankAccount("Alvina", 2000.0);

// Or we could declare our array, and populate it with new 
// BankAccounts in a single statement.
BankAccount acct[] = {new BankAccount("Angie",500.00),
                        new BankAccount("Z", 200.00),
                        new BankAccount("Alvina", 2000.0)};
// How would we access methods for the BankAccount objcts in our array?
acct[0].getName()
acct[2].getName()
acct[1].getName()
// to determine the length of our array we use the array variable length
acct.length

// We could use the length to control the number of iterations in our loop
// as we access each element in our array.
for (int i = 0; i < acct.length; i++) {
System.out.println(acct[i].getName());
}
// using the java code we created today:

// look at numNulls
BankAccount accts2[] = new BankAccount[3];
ArrayExamples.numNulls(accts2)
accts2[2] = new BankAccount("Alvina", 2000.0);
ArrayExamples.numNulls(accts2)


// look at toCharArray
char mychars[] = ArrayExamples.toCharArray("today is monday");
for (int i = 0; i < mychars.length; i++) { // what is in our array
   System.out.println(mychars[i]);
}

// look at printCharArray
ArrayExamples.printCharArray(mychars)