int ages[]; // declare a reference
ages = new int[10]; // construct it
int ages2[] = new int[10]; // short form
// an even shorter form is the initializer form:
int monthLen[] = {
31, 28, 31, 30,
31, 30, 31, 31,
30, 31, 30, 31
};
final int MAX = 10;
Employee staff[] = new Employee[MAX];
for (int i=0; i<MAX; i++)
staff[i] = new Employee("NoName", i);
// Two-Dimensional Arrays
// Want a 10-by-24 array
int me[][] = new int[10][];
for (int i=0; i<10; i++)
me[i] = new int[24];
System.out.println(me.length);
System.out.println(me[0].length);
int me2[][]; // shorter
me2 = new int[10][24];
int me3[][] = new int[10][24]; // shortest
double data[][] = {
{24, 100},
{10, 20},
{32, 98.6},
};
System.out.println("Should print 98.6: " + data[2][1] );
int nEmployees = 0;
// allocate array
staff = new Employee[MAX];
staff[nEmployees++] = new Employee();// allocate Employee an object
if (nEmployees >= staff.length) {
System.err.println("Too Many Staff Hired!!");
System.exit(1); // wimp out
}
// better to reallocate, making the data structure dynamic
if (nEmployees >= staff.length) {
Employee tmpstaff[] = new Employee[staff.length + 10];
for (int i=0; i<staff.length; i++) { //or System.arraycopy()
tmpstaff[i] = staff[i];
}
staff = tmpstaff; // copies the array reference
// old array will be garbage collected soon...
}
