Thread: issue sending value to new pane

Sorry, I don't need or want to clutter up my PC with special jar files for testing a program.

If you want to stick with the IntelliJ packages, I'll leave you for someone that is willing to download and install whatever jar files are needed.

If you will write vanilla java code, post it and I'll try to help.

If you have programming questions in the future you will have better luck finding some one to help if you do not use 3rd party packages that require downloads, creating folders, tailoring the IDE for that one problem and then doing compiles and executions. I'm sure there are people willing to do all that.

I prefer to keep it simple with: copy and paste the source, compile and execute.

need the value of lblamnt or tval to be carried to index2

When does the value need to be available in Index2?
When it is changed in an instance of the Index class?
Or when it is needed by some code in the Index2 class?

If the latter, if a reference to the instance of Index is passed to the constructor of Index2 when Index2 is created, the code in Index2 could use tht reference to call a getter method in Index.

Passing a reference to an object as an arg in a constructor:

   AnotherClass aReferenceToAnObject = ....
 
   // In class that creates instance of SomeClass
   ... = new SomClass(aReferenceToAnObject);  // pass object reference to a constructor
 
  // The constructor for SomeClass
  public SomeClass(AnotherClass refToObject) {
     this.refToObject = refToObject;  //  save reference 
     ...
 
    // In SomeClass
    // Call aMethod in AnotherClass using passed reference
   refToObject.aMethod();

#1: Get rid of the initialization of gg in Index2

Before:

Index gg = new Index();

After:

Index index;

This was a useless instance if Index that never gets used the way you have it now.

(change the reference to gg in getter() to match index)


#2: Make zero and one a global private variable in mainPage.

//GUI Forms
    final static String INDEX = "Index";
    final static String INDEX2 = "Index 2";
 
 
//Panels
    private Index zero;
    private Index2 one;

#3:Get rid of the declare of zero and one in the constructor.

Before:

public MainPage(){
        setContentPane(contentPane);
        setModal(true);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 
        Index zero = new Index();
...
        Index2 one = new Index2();

After :

public MainPage(){
        setContentPane(contentPane);
        setModal(true);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 
        zero = new Index();
...
        one = new Index2();

#4: Change the arguments the constructor of Index2 to accept an instance of Index

    public Index2(Index index) {
        this.index = index;
    }

#5: Add instance of Index2 to Index

Index2 index2;

#6: Create a setter in Index

public void setIndex2(Index2 index2)
{
    this.index2 = index2;
}

#7: Change the call to the constructor of Index2 and call setter for zero to set the references to each other in MainPage

        Index zero = new Index();
        zero.setParentForm(this);
        cardPanel.add(zero.getPanel(), INDEX);
 
        Index2 one = new Index2(zero);
        one.setParentForm(this);
        cardPanel.add(one.getPanel(), INDEX2);
 
        zero.setIndex2(one);

And now.... as Norm said...

Originally Posted by Norm

When does the value need to be available in Index2?

As I said in my very first post...

Originally Posted by brynpttrsn

you only call the gval() function in the constructor at the time of app initialization. Im not sure if any changes that are made post initialization will be reflected in the value generated by gval(). Might have to be called later in the game after its been changed depending on when you want that value to be sent over to Index2:one.

You probably want it somewhere in here:

        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(index2.getter() + " " + lblamnt.getText());
                parentForm.showPanel(MainPage.INDEX2);
            }
        });

I have added a print statement since they always help in figuring out what the values of all the variables are without IDEs or breakpoints.


WORDS OF SLIGHT BUT NOT ENTIRELY KIND OF CONFUSION AND OR GENERAL BEWILDERMENT:

Usually variable names are slightly more descriptive of exactly what they are kind of like how I changed "gg" to "index". You may have worked with the code for months and know exactly what types and uses of all of the variables are, but when you get stuck and need to ask for help... whomever is going to look at the code, this time Norm and I, is really going to have trouble discerning what variables "gg" "zero" or "one" are. It also might help the future you if you need to come back and edit, revise, or reuse your own code. "zero" could be changed to something like "index" and "one" could probably be something like "index2".


DISCLAIMER: I, like Norm, have not downloaded, compiled, run, tested, or anything like that in order to get this to compile on my own system. I have not tested or debugged any code and in fact don't even know if my code will compile as is. It was too much trouble to even write a compileable source since so many variable declarations in your provided source are missing.

Essentially, I'm just eyeballing it.

DISCLAIMER#2: This solution is just how I would do it in addition to reading the suggestion from Norm on which direction to go. In no way am I saying that this is the only way or the best way. I am open for suggestions for improvements.

If you need additional troubleshooting guidance I'll be available after my brief hospital visit... I broke all of my fingers typing this extensively in depth novel of a post.

Good day sir.

"Index2(Index) in Index2 cannot be applied"

The compiler only found one constructor that takes an Index object. The code needs to pass a reference to an Index object to the constructor.

"Cannot resolve symbol 'index2'"

The compiler can not find a definition for the variable: index2. Make sure a variable is defined that is in scope where it is referenced.

"Cannot resolve symbol index"

Same as above.

From your code:

  private MainPage parentForm;    //  define variable here
   .... 
    public void setParentForm(final MainPage parentForm) {
        this.parentForm = parentForm;    // save value in above variable
    }

The variables need to be defined in scope where they are being used. The compiler could not find definitions for the variables that are shown in the error messages:

"Cannot resolve symbol 'index2'"

"Cannot resolve symbol 'index'"

Go to the classes where those errors are located and add the missing definition for the variable the compiler could not find.

Look at the example in post#63. It shows that the variable is defined OUTSIDE of the method at the class level.

Also java is case sensitive. I is not the same as i. Index is different from index.

Here is another example:

/* Display compiler error message for missing definition
*/
 
public class MissingDefinition {
//   String theVariable;       //  define variable here - it is missing as a comment
 
   public void saveTheVariable(String theVariable) {
	   this.theVariable = theVariable;
	}
}/*  The error message for that above:
 
MissingDefinition.java:7: error: cannot find symbol
	   this.theVariable = theVariable;
	       ^
  symbol: variable theVariable
1 error
*/

Removing the // at the start of line 5 will allow the compiler to see the definition of theVariable and there won't be a compiler error.

MainPage still persists.

Please explain.

Do you understand what I said in post#61?

Look at the constructor for Index2 and see what its requirements are.

its looking for a variable to be sent in the Index2().

Yes, what is the data type of that variable?
Hint: The data type is given in the error message and in the source line that defines the Index2 constructor.

Did you fix the compiler errors? Does the code compile ok now?

the lblamnt is a JLabel and tvar is a String.

Are you moving to a new problem now? Please explain.

I work on various forums with multiple programming problems and do not always remember what was posted on a particular problem days ago. It'd be helpful if you'd explain what the current problem is.