Netbeans

[MallardsReach]

Hi I am looking at Netbeans and have in a button control the following code;

  int firstNum, answerNum = 0;
        for (firstNum = 1; firstNum <= 12; firstNum ++)
            answerNum = firstNum \* 2;
             displayTable.setText(firstNum + " x 2  = " + answerNum);

but in the textarea it only shows 13 x 2 = 24 does the for not work in netbeans? or does it have to be done differently.

[Peter_in_2780]

That's exactly what I'd expect. When firstNum is 12, answerNum is set to 24. Then the for is executed again, increments firstNum to 13, then the test fails, so it goes on to display what you see. Cheers, Peter

Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

[MallardsReach]

Thanks Peter, So my question is how do I get it to display in the Textarea as it does when i run it in the cmd Like this, 1 x 2 = 2 2 x 2 = 4 3 x 2 = 6 etc?

[Lost User]

This is not netbeans (which is an IDE), it is Java code. You need to understand the difference. As to your question: You only have a single line being processed in the for loop. You need to put both lines inside a block thus:

for (firstNum = 1; firstNum <= 12; firstNum ++) {
answerNum = firstNum * 2;
displayTable.setText(firstNum + " x 2 = " + answerNum);
}

It is good practice to use braces in all repeat blocks, even those with only a single line. It means if you ever add another line to the loop it will always be inside the block.

[MallardsReach]

Thanks for the reply and advice it now works as I wanted it to. I changed the code as follows using "\n" to give me a new line each time it loops;

private void twoButtonActionPerformed(java.awt.event.ActionEvent evt) {                                          
        int firstNum, answerNum = 0;
        for (firstNum = 1; firstNum <=12; firstNum ++){
            answerNum = firstNum \* 2;
            displayTable.append(firstNum + " x 2  = " + answerNum +"\\n");
}
}

In summing up then, Netbeans is developed by Apache and is just an environment to make it easier to develop Java with a windows style, similar to Visual Basic but using Java in the buttons action event. Yes?

[Lost User]

MallardsReach wrote:

is just an environment to make it easier to develop

Yes, it is an Integrated Development Environment, similar to Visual Studio, eclipse etc. It is designed to provide editors and debuggers for different languages, and automatic compilation. The actual final product does not need to beWindows style, although it helps if the IDE also has a visual design feature so you can see the layout of your form as you create it. In the old days you had to write all the Windows code by hand, build and run, before you could see what it looked like.

[MallardsReach]

I did write code many years ago, Spectum, Amos and VB but so much has changed although still similar, I'm liking Java just need to get used to the syntax. The IDE does have a design feature so you can set up how it will look when run and then start placing the code in the buttons, checkboxes etc it even has preview design as well. No doubt I will be back at the forum again but in the mean time Thanks for all the help and guidance.

[Lost User]

You're welcome. Maybe you will be answering questions in the future.