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Thread: Post variable in the main class

  1. #1
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    Lightbulb Post variable in the main class

    Hello guys. I wanna ask you, how to post variable from any class in the main class? I know how to post from main class in the next class, but dunno how to post from next class in the main..
    Can you help me?

    Thank you

    Sorry for bad english language


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    Default Re: Post variable in the main class

    Please post an example of what you mean by Main class, Next class, and how you want to share variables between them.

    Even when a common written language, like English, may not be the best between us, we should be able to communicate in another language we both know and love, Java.

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    Default Re: Post variable in the main class

    I mean Main class which have a public static void main(String[]args) { } method.

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    Default Re: Post variable in the main class

    I built on an earlier example I created for a similar topic. Since you wouldn't give an example, I have no idea if it answers your question, but I've covered most every angle of passing values between classes. If you think of another approach or still have questions, please let me know.
    // a class with a main() method to start
    // a simple class that sends values to another class via the
    // other class' constructor and using a setter method in the other class
    public class PassValuesBetweenClassesDemo
    {
        // instance variables
        int rValue;
        int gValue;
        int bValue;
        ReceiveClass receiveClass;
     
        // default constructor
        public PassValuesBetweenClassesDemo()
        {
            rValue = 5;
            gValue = 15;
            bValue = 25;
     
            // create an instance of ReceiveClass and pass the values
            // through the constructor
            receiveClass = new ReceiveClass( rValue, gValue, bValue );
     
            // pass an instance of SendClass to ReceiveClass
            receiveClass.setSendClass( this );
     
            // output the values
            receiveClass.printRGBValues();
     
            // or, alternatively send the values to the receiveClass
            // instance using the setter method
            receiveClass.setRGBValues( rValue + 5, gValue + 5, bValue + 5 );
     
            // output the new values
            System.out.println( "\nAfter increasing the values by 5, " );
            receiveClass.printRGBValues();
     
            // pass the values back from receiveClass to sendClass
            receiveClass.setValuesInSendClass();
     
            // print the values as now set
            System.out.println( "\nAfter passing the values back from the"
                + " receive class,\nthe values in the send class are: " );
            System.out.println( "rValue: " + rValue );
            System.out.println( "gValue: " + gValue );
            System.out.println( "bValue: " + bValue );
     
        } // end default constructor
     
        // a main() method
        public static void main( String[] args )
        {
            new PassValuesBetweenClassesDemo();
     
        } // end method main()
     
     
        // setters to set the values
        public void setRValue( int rValue )
        {
            this.rValue = rValue;
     
        } // end method setRValue()
     
        public void setGValue( int gValue )
        {
            this.gValue = gValue;
     
        } // end method setGValue()
     
        public void setBValue( int bValue )
        {
            this.bValue = bValue;
     
        } // end method setBValue()
     
    } // end class PassValuesBetweenClassesDemo
     
    // a class to receive the values
    class ReceiveClass
    {
        // instance variables
        private int rValue;
        private int gValue;
        private int bValue;
        private PassValuesBetweenClassesDemo sendClass;
     
        // a constructor that accepts the 3 values
        public ReceiveClass( int rValue, int gValue, int bValue )
        {
            this.rValue = rValue;
            this.gValue = gValue;
            this.bValue = bValue;
     
        } // end constructor
     
     
        // a method to set the values
        public void setRGBValues( int rValue, int gValue, int bValue )
        {
            this.rValue = rValue;
            this.gValue = gValue;
            this.bValue = bValue;
     
        } // end method setRGBValues()
     
        // to output the values
        public void printRGBValues()
        {
            System.out.println( "The values in the receive class are: " );
            System.out.println( "rValue: " + rValue );
            System.out.println( "gValue: " + gValue );
            System.out.println( "bValue: " + bValue );
     
        } // end method printRGBValues()
     
        // to set the instance variable sendClass
        public void setSendClass( PassValuesBetweenClassesDemo sendClass )
        {
            this.sendClass = sendClass;
     
        } // end method setSendClass()
     
        // pass the values back to SendClass
        public void setValuesInSendClass()
        {
            sendClass.setRValue( rValue );
            sendClass.setGValue( gValue );
            sendClass.setBValue( bValue );
     
        } // end method setValuesInSendClass()
     
    } // end class ReceiveClass

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    Default Re: Post variable in the main class

    Thanks I fix it THANK THANK!!!!!

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