CSCI 15A Course Material

arrays and loops

Array (and indice instantiation)

Arrays can hold primitive data types or Objects (intances of a certain class)

All members of an array will have to be the same type
The lines below instantiate the array only not the members in the array.

int grades [] = new int [50];

char alphabet [] = new char [26];

double money [] = new double[30];

String [] names = new String[30];

T [] b = new T [5]

Student [] CSCI15A = new Student[70];

Person [] familyRecord = new Person[numPersons];

Color [] rainbow = new Color[7];

Loop part

Now let's put things into the array

for (int i=0; i < 4; i++) { 
      list[i] = i;}

here is another

Person [] familyRecord = new Person[DEFAULT_SIZE]; 
for (int i=0; i < DEFAULT_SIZE; i++) {  
       familyRecord[i] = new Person();}

here is another

Person [] familyRecord = new Person[numPersons]; 
for (int i=0; i < familyRecord.length; i++) {  
       familyRecord[i] = new Person();}

and another

int [ ] sales = new int[SALESPEOPLE];
Scanner scan = new Scanner(System.in);
for (int i=0; i< sales.length; i++)
	   	 {
			System.out.print("Enter sales for salesperson " + i + ": ");
			sales[i] = scan.nextInt();
	   	 }