Oop Module 2

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Syntax: = value;

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assigning a value (Variables)

name = “Maria Blanco”;

age = 22;

price = 200.50;

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is one of dozens of methods in the System class. The System class is a part of the core Java language package of the Application Programming Interface (API)

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System.out.println( )

The println method

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What are the 4 java language fundamentals?

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1. Identifiers

2. Keywords

3. Comments

4. Data types

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provides string formatting

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printf()

(Java output)

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defines a class, a template for an object of derived type HelloWorld

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class HelloWorld

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A comment enclosed within /* */

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A multi-line comment

(Java comments)

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What are the three types of java comments?

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1. A single-line comment starting with //

2. A multi-line comment enclosed within /* */

3. A documentation or javadoc comment is enclosed between /** and */. These comments can be used to generate HTML documents using the javadoc utility, which is part of Java language comment.

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are names that are given by the programmer as name of variables, methods or functions, classes etc.

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Identifiers

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comment starting with //

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A single-line

(Java comments)

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The name used as an identifier must follow the following rules in JavaTM technology:

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1. Each character is either a digit, letter, underscore or currency symbol.

2. First character cannot be a digit.

3. The identifier name must not be a reserved word.

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Syntax: ; [= value;]

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variable declaration

ex: String name;

int age;

double price = 55.66;

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Reads a byte value from the user.

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nextByte()

(Scanner input types)

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are used in converting one data type (such as a String) into another data type (such as int or double).

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Java Wrapper Classes

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It returns void because the Java interpreter does not expect to receive or process any output from the class.

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void

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is a part of the core Java language package of the Application Programming Interface (API)

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The System class

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Example of derived data types (Java data types)

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string, date, integer, double, long, float

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Example of Primitive data types (Java data types)

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byte, short, int, long, float, double, boolean, char

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Reads a string value from the user.

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nextLine()

(Scanner input types)

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It is also used in wrapping a primitive value into an object.

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java wrapper class

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are used in converting one data type (such as a String) into another data type (such as int or double).

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Java Wrapper Classes

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is a class

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System

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comment starting with //

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A single-line

(Java comments)

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enclosed between /** and */. These comments can be used to generate HTML documents using the javadoc utility, which is part of Java language comment.

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A documentation or javadoc comment is

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is a public static field: it accepts output data.

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out

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Reads a boolean value from the user.

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nextBoolean()

(Scanner input types)

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Reads a short value from the user.

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nextShort()

(Scanner input types)

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is used to get user input, and it is found in the java.util package.

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The Scanner class

(Java user input)

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are reserved and cannot be used as identifiers.

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Java keywords

Ex: abstract, boolean, break, float, class, default, continue, char, void, while, else, int, switch

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is one of dozens of methods in the System class. The System class is a part of the core Java language package of the Application Programming Interface (API)

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System.out.println( )

The println method

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To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation. T/F

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T

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state of the method, it is ____ because it must be called before the class that hosts the method is instantiated

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static

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It prints string inside the quotes.

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print()

(Java output)

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It prints string inside the quotes similar like print() method. Then the cursor moves to the beginning of the next line.

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println()

(Java output)

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Reads a boolean value from the user.

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nextBoolean()

(Scanner input types)

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Reads a byte value from the user.

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nextByte()

(Scanner input types)

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Reads a byte value from the user.

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nextByte()

(Scanner input types)

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are names that are given by the programmer as name of variables, methods or functions, classes etc.

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Identifiers

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Reads a boolean value from the user.

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nextBoolean()

(Scanner input types)

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Reads a double value from the user.

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nextDouble()

(Scanner input types)

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Reads a boolean value from the user.

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nextBoolean()

(Scanner input types)

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Reads a string value from the user.

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nextLine()

(Scanner input types)

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access specifier/modifier, the main method is declared public so that it is accessible as part of the public interface of the program.

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public

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Reads a long value from the user

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nextLong()

(Scanner input types)

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Reads a double value from the user.

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nextDouble()

(Scanner input types)

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Reads an int value from the user

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nextInt()

(Scanner input types)

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Reads a float value from the user.

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nextFloat()

(Scanner input types)