Java: February 2017

Wednesday, February 22, 2017

Java ADF creating EO and VO

After creating a Data Base connection,

Click the 'Applications Window options' and change the Package level to '1'

Right click on Test Modal and create a new 'Entity Object'

Click 'OK'

Give a name to the entity object

Type Testmodel.eo for the package name. This creates a package named eo
inside the package Testmodel. Then click 'Browse' following to Schema
Object

You can choose the data base you connected earlier from the Database schema
list Then click Query and select the required table and double click then press
'OK'

Click 'Next'

Select the attribute for the primary key and tick the Primary key check box
and click 'Next'

Click ' Next'

Click 'Next'

Click 'Finish'

Right click on Test Modal and create a new 'View Object'

Give a name to the view object and type Testmodel.vo for the package
name. This creates a package named vo inside the package Testmodel.
Then click 'Next'

Double click 'TestEO' to select it

Click 'Next'

Double click the data base table fields to select them

Click 'Next'

Double click to select

Click 'Next'

Click 'Finish'

Creating EO and VO is complete

Monday, February 20, 2017

Java ADF connecting to a Data Base

When you open Oracle JDeveloper Studio you will be prompted to the following screen

Select Connect to a Data Base

Select 'Create a Data Base Connection'

Give a name to your connection

Select the connection type you use. Here we are using a MySql Data Base

Type the username and the password and give the Data Base name. Then
test the connection and press 'Ok' , if the connection is unsuccessful
check the username, password and the Data Base name

Click the not started button and change it to 'Done'

Sunday, February 19, 2017

Simple Calculator using java

Calculator with user input (Using scaner)

Class = Cal

 import java.util.Scanner;  
 public class Cal {  
      public static void main(String[] args) {  
           temp();   
      }  
      public static void oparator(int x, int y,String oparator) {  
           if("ADD".equals(oparator.toUpperCase())){  
                int z = x + y;  
                System.out.println(z);  
           }  
           else if("SUB".equals(oparator.toUpperCase())) {  
                int h = x - y;  
           System.out.println(h);  
           }  
           else if("DIV".equals(oparator.toUpperCase())) {  
                int i = x / y;  
           System.out.println(i);  
           }  
           else if("REM".equals(oparator.toUpperCase())) {  
                int j = x % y;  
           System.out.println(j);  
           }  
           else if("MUL".equals(oparator.toUpperCase())) {  
                int k = x * y;  
           System.out.println(k);  
           }            
      }  
      public static void temp(){  
          Scanner sc=new Scanner(System.in);  
          System.out.println("Seclect the Oparator");  
          String oparator=sc.nextLine();  
          System.out.println("Enter a first number: ");  
          int FirstNumber=sc.nextInt();  
          System.out.println("Enter a Second number: ");  
          int secondNumber=sc.nextInt();  
          oparator(FirstNumber,secondNumber,oparator);  
          temp();  
      }  
 }

You can add more operators

Operator	Description
+ (Addition)	Adds values on either side of the operator.
- (Subtraction)	Subtracts right-hand operand from left-hand operand.
* (Multiplication)	Multiplies values on either side of the operator.
/ (Division)	Divides left-hand operand by right-hand operand.
% (Modulus)	Divides left-hand operand by right-hand operand and returns remainder.
++ (Increment)	Increases the value of operand by 1.
-- (Decrement)	Decreases the value of operand by 1.

Calculator without user input

 public class cal{  
      public static void main (String args[]){  
           int x = 5 ;  
           int y = 6 ;  
           System.out.println("x + y =" + (x+y));  
           System.out.println("x - y =" + (x-y));  
           System.out.println("x / y =" + (x/y));  
           System.out.println("x * y =" + (x*y));  
           System.out.println("x % y =" + (x%y));  
      }  
 }

Sketch

You can change the data printed in green

public class cal{

public static void main (String args[]){

int x = 5 ;

int y = 6 ;

System.out.println("x + y =" + (x+y));

System.out.println("x - y =" + (x-y));

System.out.println("x / y =" + (x/y));

System.out.println("x * y =" + (x*y));

System.out.println("x % y =" + (x%y));

}

Saturday, February 18, 2017

Creating "Hello World" java program

Example

Class = Simple

 class Simple{  
      public static void main (String args[]){  
           System.out.println("Hello World");  
      }  
 }

Sketch

Copy the following java codes and replace data printed in green. Then run the java program.

class Simple{

public static void main (String args[]){

System.out.println("Hello World");

}

How to compile and run the above program using command prompt

Copy the above sketch into the notepad and save it with the extension .java instead of .txt

Then open the command prompt and type,

cd C:\Users\Inova\Desktop\new\Hello world

here (C:\Users\Inova\Desktop\new\Hello world) is the path of the folder in which the java file that you created before is saved.

Then type,

javac Simple.java

and enter. by typing 'javac' we compile the java file. A new file called CLASS file will be created. Here 'Simple' is the name which the Java file is saved.

Then type,

java Simple

and enter. Then the compiled java file will run, giving the output "Hello World".