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Thread: bluej some questions about a simple car details class

  1. #1
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    Default bluej some questions about a simple car details class

    Hallo ,
    this is a class in bluej about car details i created
    the problems so far in the class are that it allows any number in the transmition when i go to create the class , it should only allow 1 and 2(i dont really need to do it , but i am asking if there is a way around it ) and also in the toString method to show the manual and automatic and not 1 and 2 in the type

    thanks for all the help
    public class Car 
    {
     
      // set up the two constants for the transmition 
      public static final int manual = 1;
      public static final int automatic = 2;
      // instance variables - replace the example below with your own
        private static  int  engineSize;
        private int  fuel;
        private final int type ;
     
         /**
         * Constructor for objects of class Car
         */
        public Car(int newFuel , int newEngineSize , int Trans  ) {
           fuel = newFuel;
           engineSize = newEngineSize;
           type = Trans;
            }
         /**
         Change the fuel 
         */
     
        public void getFuel()
        {
         System.out.println("The fuel of this car is " + fuel  );
        }
     
        public void getEngineSize()
        {
        System.out.println("The engineSize of this car is " +  engineSize);    
        }
     
        public  void setFuel( int newfuel)
        {
        fuel = newfuel;
        }
     
        public String getTypeAsString (){
    		if (type == automatic){
    			return "automatic";
    		}
    		else if (type == manual){
    			return "manual";
    		}
    		return "";
    	}
     
     
        public String toString(){
          return ("fuel "  + fuel + " Engine Size " + engineSize + " Transmition  " + type ) ;
     
        }
     }
    Last edited by infernocy; April 7th, 2012 at 01:13 PM. Reason: some writting errors


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: bluej some questions about a simple car details class

    You can validate the data when it is received in the constructor and throw an exception if the data is invalid. Many java classes do that. See the Integer class for an example.
    You would need to add a throws clause to the constructor's definition.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    infernocy (April 7th, 2012)

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    Default Re: bluej some questions about a simple car details class

    thanks i will try
    where can i find the integer class ?

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    Default Re: bluej some questions about a simple car details class

    The doc for all the java SE classes:
    Java Platform SE 6
    Find the class in the lower left, click it and the doc will show in the main frame.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: bluej some questions about a simple car details class

    excuse me im the beginner, i want to ask how entering source code like that, thank you

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    Default Re: bluej some questions about a simple car details class

    Quote Originally Posted by erdy_rezki View Post
    excuse me im the beginner, i want to ask how entering source code like that, thank you
    When you post select the Go Advanced button, copy and paste your code and use the highlight tags, or select it and then click the "#" button above the text area. Here is the list of all the tags and how to use them.

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