Notes

The . (dot) operator is also called the member access operator.

Primitive type variables directly store data into their memory space.

The new operator can be used to create a class object.

Members of a class consist of packages, methods, and libraries.

The following statements creates alpha to be a two-dimeansional array of 25 rows and 10 columns.

int[][] alpha = new int[25][10];

A set method of a class first accesses the values of the data members of the class and then changes the values of the data members.

In the class String, the substring method extracts a string from within another string.

In column processing, a two-dimensional array is processed one column at a time.

Arrays have a fixed number of components.

When writing output to a file, if the file is not closed at the end of the program, you may not be able to view your output properly.

indexOf(char ch) is a method in the class String.

The DecimalFormat class can be used only to format the output of decimal numbers.

The modifier static in the heading specifies that the method can be invoked by using the name of the class.

A class can have only one constructor.

A constructor has no type and is therefore a void method.

Every object has access to a reference to itself.

The built-in operation that is valid for classes is the dot operator (.).

The word new is an operator.

Suppose that you have the following declarations.

int[] alpha = new int[100];
int[][] beta = new int[25][4];

In this declaration, the array alpha has more components than the array beta.

If the specified output file does not exist, the computer prepares an empty file for output.

String variables are primitive variable types.

The method length in the class String returns the number of characters in the string not including whitespace characters.

The + operator is used to instantiate a class.

In row processing, a two-dimensional array is processed one row at a time.

If a member of a class is a method, it can (directly) access any member of the class.

Given String name; the value of name is directly stored in its memory space.

If the specified output file does not exist, you will get a FileNotFoundException.

A get method of a class changes the values of the data members of the class.