Android App

Methods

Methods are nothing but members of a class that provide a service for an object or perform some business logic.

Method Overloading

Overloading: Multiple methods with the same name but different parameter lists.

In constructors:

Item item1 = new Item();
Item milk = new Item(“milk”, 0.99, 3);

String x = new String();
String y = new String(“Hello”);

In methods:

String x = new String("Hola, cómo estás");
x.substring(2);
x.substring(2, 5);
x.indexOf("h");
x.indexOf("h", 1);

Standard Methods

Two methods that should be included in classes (Good practice to include it):

• toString
• equals

The toString Methodg

• Returns data stored in an object as a String:
  • Allows the contents of an object to be displayed
  • Can format the contents whatever way you wish
  • MUST return a String*
  • MUST NOT take a parameter*

public String toString() {
    return name + ", " + day + " " + monthNames[month-1] + " " + year + ", " + address;
}

Example result:

"P. Sherman, 30 May 2003, 42 Wallaby Way, Sydney"