Netbeans and backends?

[Sam Bluesman]

Hello.

I have a question concerning netbeans...

I know how to take in a string from a user and process it using code that is placed in the same place as the code for the jframes etc. but does anyone know of a tutorial that can tell me how i can take a string froma JTextfield and pass that to some java class, process it, and pass the result back into the form.

Purely as an example, say a user types in their name and i want to return their name with the letters placed in the order of last to first i.e. i revese the letters in thir name. As oppsed to writing that code in the same class that contains the code for the jTextField, JFrame etc, can i pass the string to an external class that processes the data and passes it back to the main class that allows me represent it in a jLabel or jT3extField?

Get my drift?

Cheers

[Campbell Ritchie]

I think I know what you mean. You want to reverse a String.
Try its toCharArray method and Arrays.reverse.

[Sam Bluesman]

Hi there.

Thanks for the response, but I dont really. I want to know how you pass things from the class containing the code for the forms etc to a completely sepate class file that processes it and returns it back to the class contining the form code so that it can be disaplyed in a jTextBox or jLabel in Netbeans
[ April 19, 2007: Message edited by: Sam Bluesman ]

[pete stein]

Originally posted by Sam Bluesman:
Hi there.

Thanks for the response, but I dont really. I want to know how you pass things from the class containing the code for the forms etc to a completely sepate class file that processes it and returns it back to the class contining the form code so that it can be disaplyed in a jTextBox or jLabel in Netbeans.

I think I get your drift, but I'm not sure how this process would be different from non-Swing Java. Your GUI class would utilize the outside class's (let's call it the Logic class) services by instantiating a Logic class object if it's an instance class and then calling this object's methods or by just calling the Logic class's methods if they are static. I imagine you'd do all this in the actionListener of a GUI button.

Sorry if I am oversimplifying the question.

Good luck!

[Andrei Pat]

You create a separate class like this:

public class MySeparateClass(){
  public String myReverseStringMethod(String myStrig){
  //reverse string code goes here, it computes myReversedString from myString
  return myReversedString;
  }
}

in your GUI class (where your text field is available):

  ...
  String text = myJTextField.getText();
  MySeparateClass c = new MySeparateClass();
  String revText = c.myReverseStringMethod(text);
  myJTextField.setText(revText);
  ...

[pete stein]

As a very simple example, say I have a JTextPane called jTextPane1 and two buttons on my JFrame. And say that I have a separate java class called LogicClass like so:

public class LogicClass {
    
    private String myStr;
 
    public LogicClass(String myStr) {
        this.myStr = myStr;
    }
    
    public String reverseStr() {
        char[] revCharArr = myStr.toCharArray();
        StringBuilder mySB = new StringBuilder();
        for (int i = 0; i < revCharArr.length; i++) {
            mySB.insert(0, revCharArr[i]);
        }
        return mySB.toString();
    }
    
}

Then I can use the LogicClass from within the GUI class like so:

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
        jTextPane1.setText("Hello World from NetBeans!!!");
    }                                        
 
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
        LogicClass myLC = new LogicClass(jTextPane1.getText());
        jTextPane1.setText(myLC.reverseStr());
    }                                        

[Sam Bluesman]

Thank you everybody. Much appreciated.