Arrays and Array Lists - Java Concepts - page 407

60 */
61 public double getBalance()
62 {
63 return balance;
64 }
65
66 private int accountNumber;
67 private double balance;
68 }

Output

Size: 3
Expected: 3
First account number: 1008
Expected: 1008
Last account number: 1729
Expected: 1729

296
297

S ELF C HECK

3. How do you construct an array of 10 strings? An array list of strings?

4. What is the content of names after the following statements?

ArrayList<String> names = new
ArrayList<String>();
names.add("A");
names.add(0, "B");
names.add("C");
names.remove(1);

C OMMON E RROR 7.3: Length and Size

Unfortunately, the Java syntax for determining the number of elements in an array,
an array list, and a string is not at all consistent. It is a common error to confuse
these. You just have to remember the correct syntax for every data type.

Data Type Number of Elements

a.length

Array

a.size()

Array list

a.length()

String