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Thread: return

  1. #1
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    Default return

    class aa7
    {
    public static void main (String[] args)
    {
    System.out.println("HOURS IN A DAY: "+Hours(int days=2));
    }
    public class Hours{
       private static final int NUMBER_OF_HOURS_IN_A_DAY = 24;
     
       public int calculateHoursInDays(int days)
      {
         return days * NUMBER_OF_HOURS_IN_A_DAY;
       }
    }
    }


    I want printout :48



    Errors :

    --------------------Configuration: <Default>--------------------
    C:\aa7.java:5: error: '.class' expected
    System.out.println("HOURS IN A DAY: "+Hours(int days=2));
    ^
    C:\aa7.java:5: error: ';' expected
    System.out.println("HOURS IN A DAY: "+Hours(int days=2));
    ^
    2 errors

    Process completed.

    General output :
    Error: Could not find or load main class aa7


  2. #2
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    Default Re: return

    when the error says could not load main class aa7, it probably should be an issue with the name of your file. You should know that in java, the name of the main class should be same as the file name. Here you file name should be aa7.java.

    Next
    System.out.println("HOURS IN A DAY: "+Hours(int days=2));
    This is completely a wrong statement in java.
    you do not declare anything where parameter is passed. It should only be Hours(2).

    Rename public class Hours as public static class Hours and public int calculateHoursInDays(int days) as public static int calculateHoursInDays(int days)

    This should help you.

  3. #3
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    Default Re: return

    Code after changes :

    class b
    {
    public static void main (String[] args)
    {
    System.out.println("HOURS IN A DAY: "+Hours(2));
    }
    public static class Hours{
       private static final int NUMBER_OF_HOURS_IN_A_DAY = 24;
     
       public static int calculateHoursInDays(int days)
      {
         return days * NUMBER_OF_HOURS_IN_A_DAY;
       }
    }
    }


    Output/errors :

    C:\Documents and Settings\dipak\Desktop>javac b.java
    b.java:5: error: cannot find symbol
    System.out.println("HOURS IN A DAY: "+Hours(2));
    ^
    symbol: method Hours(int)
    location: class b
    1 error

    C:\Documents and Settings\dipak\Desktop>

  4. #4
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    Default Re: return

    dipakshah8944
    sorry for my rude question: Are you a Java rookie? Your program is garbage. Here is how your program should be:
    class b {
    	public static void main (String[] args) {
    		System.out.println("HOURS IN A DAY: "+Hours(2));
    	}
    	public static int Hours(int day)  {
    		final int NUMBER_OF_HOURS_IN_A_DAY = 24;
    		return day * NUMBER_OF_HOURS_IN_A_DAY;
    	}
    }

  5. #5
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    Default Re: return

    class b
    {
    public static void main (String[] args)
    {
    b class1 = new b();
    b.Hours class2 = new b.Hours();
     
    System.out.println("HOURS IN A DAY: "+ class2.calculateHoursInDays(2));
    }
     
    public static class Hours{
       private final int NUMBER_OF_HOURS_IN_A_DAY = 24;
     
       public  int calculateHoursInDays(int days)
      {
         return days * NUMBER_OF_HOURS_IN_A_DAY;
       }
    }
    }
    Try this code
    When you have a class within another class, this is how you call the method
    b class1 = new b();
    b.Hours class2 = new b.Hours();

  6. The Following User Says Thank You to kindk12 For This Useful Post:

    dipakshah8944 (July 15th, 2012)

  7. #6
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    Default Re: return

    Thanks kindk12.

  8. #7
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    Default Re: return

    Quote Originally Posted by Voodoo View Post
    dipakshah8944
    sorry for my rude question: Are you a Java rookie? Your program is garbage. Here is how your program should be:
    class b {
    	public static void main (String[] args) {
    		System.out.println("HOURS IN A DAY: "+Hours(2));
    	}
    	public static int Hours(int day)  {
    		final int NUMBER_OF_HOURS_IN_A_DAY = 24;
    		return day * NUMBER_OF_HOURS_IN_A_DAY;
    	}
    }
    java rookie? garbage? sorry? are these java ?

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