OOP

Java Netbeans IDE Function

Prepares the environment for developing java applications

IDE Full form

Integrated Development Environment

Java Netbeans

Platform to write Java code and applications (Version 7 ngayon)

What does java develop?

Desktop applications, client-server applications, mobile phone applications, games

Java major advantage

Platform independent

Java’s own runtime environment

Java Virtual Machine (JVM)

Current owner of java

Sun Microsystems

What to download?

Java Virtual Machine (JVM) and Java Development Kit (JDK)

Java code to write & extension

Source code wiith .java extension

What compiled the source code?

Another program called Javac that turns it into a Java byte code with .class extension (there should be no present errors)

File that Java Virtual Machine runs

Class file

Java Comments

Grayed out areas with forward slashes (// for single line comments; /* */ for multiline comments and asterisks that the compiler ignores

Javadoc comments

Starts with /** ends with */ to document the code (converted to HTML)

Java is case sensitive

True

Java code instructions end with a

Semicolon (;)

public class MyFirstProgram { }

Class segment notes the starting and ending of a java class segment code

Public static void main(String[] args){ }

Method

Public in “public static void main(String[] args){

the code can be accessed outside the class without creating new objects

Void in “public static void main(String[] args){

This part of the code does not return any value

Main in “public static void main(String[] args){

Denotes starting point of the java program

IntelliSense

NetBeans tries to display a list of available options after “.”

.Jar file (java archive) function

Cleans and builds your project with all necessary files for export if the program needs to be shared; will be put in a dist folder

Data

can be text, numbers, pointers, objects or some specified memory location

How is data accessed

Concatenation

Joining together direct text and a variable

You cannot start with a number for a variable name

True

You cannot have the same variable name with a keyword

True

Variable names can have a space

False

Variable names are not case sensitive

False

Java minimum and maximum value for numbers

+-2147483647 (use double to get a bigger/smaller number)

Operator Precedence

Order in which arithmetic’s operations are executed

Priority in operators

Multiplication & Division > addition and subtraction

Double quotes

String variable

Single quotes

char variable

Import java.util.Scanner; function

Tells java you want to use the scanner class in the util package of java library

Import in Import java.util.Scanner;

Reference it in the code

Scanner in Import java.util.Scanner;

Class that handles inputs

Util in Import java.util.Scanner;

utility package of the java library where scanner is stored

Scanner variable

Scanner user_input = new Scanner (System.in);

New in Scanner user_input = new Scanner (System.in);

Creates the new objects

System.in in Scanner user_input = new Scanner (System.in);

Specifies for system input

User_input in Scanner user_input = new Scanner (System.in);

TThe variable that is called to call the input methods

Next method in Scanner user_input = new Scanner (System.in);

Gets the next string of text or int of number that a user types

Println

Cursor moves to a new line after the output

Print

Cursor stays on the same line

If statement format

if(Condition {//codes to be executed if true}

Comparison Operators

> Greater than, < Less than, >= greater or equal to,

Logical Operators

&& AND, || OR, == HAS A VALUE OF, ! NOT

If else statement structure

if(condition){code to be executed} else {code to be executed}

Nested IF statement

IF statement inside another IF statement

Boolean values

One with two choices: True or false, yes or no, 1 or 0

Switch statement

Selection statement

Switch statement can be used instead

Switch statement structure

switch(your test variable) { case Testing value: statement to be executed; break; default: statement to output if no matching case found; }

Looping

Repeat execution of statements a number of times

For loop structure

for(initial value; condition; increment/decrement { statements to be repeated if true }

Intial value in for loops

Sets at what number should the repeat process start

Condition in for loops

Repeat should occur only when this condition is true

Increment/decrement

Move the counter forward or backward

Prepares the environment for developing java applications

Java Netbeans IDE Function

Integrated Development Environment

IDE Full form

Platform to write Java code and applications (Version 7 ngayon)

Java Netbeans

Desktop applications, client-server applications, mobile phone applications, games

What does java develop?

Platform independent

Java major advantage

Java Virtual Machine (JVM)

Java’s own runtime environment

Sun Microsystems

Current owner of java

Java Virtual Machine (JVM) and Java Development Kit (JDK)

What to download?

Source code wiith .java extension

Java code to write & extension

Another program called Javac that turns it into a Java byte code with .class extension (there should be no present errors)

What compiled the source code?

Class file

File that Java Virtual Machine runs

Grayed out areas with forward slashes (// for single line comments; /* */ for multiline comments and asterisks that the compiler ignores

Java Comments

Starts with /** ends with */ to document the code (converted to HTML)

Javadoc comments

True

Java is case sensitive

Semicolon (;)

Java code instructions end with a

Class segment notes the starting and ending of a java class segment code

public class MyFirstProgram { }

Method

Public static void main(String[] args){ }

the code can be accessed outside the class without creating new objects

Public in “public static void main(String[] args){

This part of the code does not return any value

Void in “public static void main(String[] args){

Denotes starting point of the java program

Main in “public static void main(String[] args){

NetBeans tries to display a list of available options after “.”

IntelliSense

Cleans and builds your project with all necessary files for export if the program needs to be shared; will be put in a dist folder

.Jar file (java archive) function

can be text, numbers, pointers, objects or some specified memory location

Data

How is data accessed

Joining together direct text and a variable

Concatenation

True

You cannot start with a number for a variable name

True

You cannot have the same variable name with a keyword

False

Variable names can have a space

False

Variable names are not case sensitive

+-2147483647 (use double to get a bigger/smaller number)

Java minimum and maximum value for numbers

Order in which arithmetic’s operations are executed

Operator Precedence

Multiplication & Division > addition and subtraction

Priority in operators

String variable

Double quotes

char variable

Single quotes

Tells java you want to use the scanner class in the util package of java library

Import java.util.Scanner; function

Class that handles inputs

Scanner in Import java.util.Scanner;

utility package of the java library where scanner is stored

Util in Import java.util.Scanner;

Scanner user_input = new Scanner (System.in);

Scanner variable

Creates the new objects

New in Scanner user_input = new Scanner (System.in);

Specifies for system input

System.in in Scanner user_input = new Scanner (System.in);

TThe variable that is called to call the input methods

User_input in Scanner user_input = new Scanner (System.in);