Thank you very much for your time. 

the first witch is before the ? is if the value is true or false – and after the ? is the action to be done IF TRUE and AFTER : is the action to be done if FALSE.

so its like this

//                          check true/false  ? true run this : false run this;
System.out.println( studenAge >= 18 ? "HE IS OVER 18" : "IS UNDER 18");

for(int row = 0; row < arrayName.length; row++){
	for(int col = 0; col < sales [ row ].length; col++)
	{
		sales[ row ][ col ] = 0;
	}
}

 

import javax.swing.*;
import java.util.*;

public class Array2D
{
	public static void main(String[] args)
	{
		String[][] iTunes = new String[3][3];
		iTunes[0][0] = "Artist";
		iTunes[0][1] = "Album";
		iTunes[0][2] = "Producer"; 
		iTunes[1][0] = "50 Cent";
	        iTunes[1][1] = "Curtis";
	        iTunes[1][2] = "G-Unit";
	    
		Scanner input = new Scanner(System.in);
		System.out.printf("%s : %s : %s \n", iTunes[0][0], iTunes[0][1], iTunes[0][2]);
		for(int row = 1; row < iTunes.length; row++)
		{
			for(int col = 0; col < iTunes[ row ].length; col++ )
			{
				System.out.printf("%s : ", iTunes[row][col]);
			}
			System.out.println();
		}
	}

}

/*			System.out.print("Write Artist name: ");
				String artist = input.nextLine();
				iTunes[row][col] = artist;
				
				System.out.print("Write " + artist + "'s album: ");
				String album = input.nextLine();
				iTunes[row][col] = album;
				
				System.out.print("Write " + artist + "'s producer: ");
				String prod = input.nextLine();
				iTunes[row][col] = prod;*/

Dealing with nulls

UtilFactory.convertNull

Java – comparing strings

Use == for primitive data types like int

If (mystring == null)

Use the equals() method to compare objects

Use .equals for strings  : if (a.equals(“cat”))

Java – Converting int to string

String myString = Integer.toString(my int value)

   or

   String str = “” + i

Java – Converting String to int

int i = Integer.parseInt(str);

   or

int i = Integer.valueOf(str).intValue();

double to String :

   String str = Double.toString(i);

long to String :

String str = Long.toString(l);

float to String :

String str = Float.toString(f);

String to double :

double d = Double.valueOf(str).doubleValue();

String to long :

long l = Long.valueOf(str).longValue();

   or

   long l = Long.parseLong(str);

String to float :

float f = Float.valueOf(str).floatValue();

decimal to binary :

   int i = 42;

   String binstr = Integer.toBinaryString(i);

decimal to hexadecimal :

   int i = 42;

   String hexstr = Integer.toString(i, 16);

   or

   String hexstr = Integer.toHexString(i);

   or (with leading zeroes and uppercase)

   public class Hex {

     public static void main(String args[]){

       int i = 42;

       System.out.print

         (Integer.toHexString( 0x10000 | i).substring(1).toUpperCase());

      }

     }

hexadecimal (String) to integer :

int i = Integer.valueOf("B8DA3", 16).intValue();

   or

   int i = Integer.parseInt(“B8DA3″, 16);    

ASCII code to String

int i = 64;

   String aChar = new Character((char)i).toString();

integer to ASCII code (byte)

char c = 'A';

   int i = (int) c; // i will have the value 65 decimal

integer to boolean

   b = (i != 0);

boolean to integer

i = (b)?1:0;

public class CharTest
{
  public static void main(String [] args)
  {
     public static void writeChar()
      {
       for(int i = 0; i < charArray.length; i++)
        {
           System.out.println(charArray[i]); // prints every char there is....
         }
       }
   }
}

Remember to call the writeChar method from another class… so it can run

A Method provides information about, and access to, a single method on a class or interface. The reflected method may be a class method or an instance method (including an abstract method).

Method example : getName(); // This will return the name value.so getName have to be getName() { return name; }
They cannot be declared in a public static void main(String[] args) ! but outside.
You have to create them in a public class { } call them from another class or same:)

Constructors – They create new objects and give them values when created if it is with a parameter.

House myHouse = new House(“Red”, 03, “Millad”)
House color, house Number, house owner – > These will be taken when created and saves it to its object…

Without parameter:House myHouse = new House(); This will make a default value that you have to write before creating a “default” class.
like HouseOwner = “Not Set”;

class Test1
{     
      public static void main (String [] args)      
       {
             int number = 1;
       }
}

 As you can see you have a class called Test1, All names of classes should be started with a capital letter.
Make a new class, lets call that Test2

class Test2
{
  Test1 nameThisNewThing = new Test1; // this makes a "connection" so you can get info from the class Test1 threw the name you gave it.
}

now this task is done with two classes, it will generate random arrays that holds 12 arrays, and will put in randomized order {u,h,b) shortcut in norwegian as uavgjort, borte, hjem.

import java.util.Scanner;
public class Tipping 
{
	static Scanner input = new Scanner(System.in);
	private static int feil = 0;
	private static int antall = 0;
	private static char dinGjett = 0;
	static char[] tegnene = new char[ 12 ];
	private static char[] dinTegn = new char[ tegnene.length];
	private static char[] str = new char[] {'H','U','B'};
	
	public static char tippingEnkeltRekke(char[] tegnene)
	{
		for( int i = 0; i < tegnene.length; i++ )
		{
			tegnene[i] += str[(char)(Math.random () * str.length)]; // Generate and place it random back to the list...
		}
		
		
		return 0;
	}
	
	public static char Min()
	{
		for(int i = 0; i < dinTegn.length; i++)
		{
			System.out.print("Din Gjett ( " + i +  " ) Skriv din liste 12 Gjett FORVENTET:  " );
			String gjett = input.next();
			dinGjett = gjett.charAt(0);
			dinTegn[i] += dinGjett;	
		}
		return 0;
	}
	
	public static int sjekkGevinst()
	{
		for(int i = 0; i < tegnene.length; i++)
		{
				if(tegnene[i] == dinTegn[i])
					{
						antall++;
					} else
						feil++;
		}
		return 0;
	}
	
	
	public static void skrivTipperekke()
	{
		for( int i = 0; i < 12; i++)
		{
			System.out.printf("\n%c%15c", tegnene[i], dinTegn[i]); // Print out all char list...
		}
		System.out.println("\nAntall Riktig Match: " + antall + "\nAntall Feil: " + feil);
		
	}

}// end of Tipping class.

Now the second class witch runs the program-

public class TippingManager
{
	public static void main(String[] args)
	{
		
		Tipping.tippingEnkeltRekke(Tipping.tegnene); // Generate the list random...
		
		Tipping.Min();
		Tipping.sjekkGevinst();
		Tipping.skrivTipperekke(); // SKriv ut alle TippeRekkene... 
	}

}