Contents - Cultural View

Java syntax 188
Classes
Classes are fundamentals of an object-oriented language such as Java. They contain members that store and
manipulate data in real-life-like way. Classes are divided into top-level and nested. Nested classes include member
classes, local classes and anonymous classes.
Declaration
Top-level class class Foo {
// Class members
}
Member class class Foo { // Top-level class
Local class class Foo {
}
class Bar { // Nested class
}
void bar() {
Anonymous class class Foo {
Initialization
}
}
}
class Foobar {// Local class within a method
}
void bar() {
}
new Object() {// Creation of a new anonymous class extending Object
};
To use non-static members of the class it must be instantiated. It is done by using the new keyword and calling the
class constructor.
Foo foo = new Foo();
Accessing members
Members of both instances and static classes are accessed with the . operator.
Accessing an instance member
Instance members can be accessed through the name of a variable.
String foo = "Hello";
String bar = foo.toUpperCase();
Accessing a static class member
Static members are accessed by using the name of the class or any other type. This does not require the creation of a
class instance. Static members are declared using the static modifier.
public class Foo {
}
public static void doSomething() {
}
// Calling the static method