如何在java GUI中查看复选框的状态？

Question

I have around 200 hundred checkboxes in a Java GUI. Now I want to have the list of all checkboxes that have been checked by the user.

I can do it in one way like this:

jCheckBox1.isSelected();

But I don't want to write this line for 200 checkboxes. Is there any way to do this through a for loop.

all the checkboxes have the name like jCheckBox1, jCheckBox2, jCheckBox3, jCheckBox4 ... jCheckBox200

Answer 1

You really should have put these in an array or Collection so that you can just loop over them. eg.

List<JCheckBox> allCheckBoxes = new ArrayList<JCheckBox>()
allCheckboxes.add(new JCheckBox());

etc.

If you have all these checkboxes declared as members then there's no excuse to just put them in a list instead.

In the meantime you could use a dodgy cast in a for loop (if all the checkboxes are on the same panel)

boolean allSelected = true;
for(Component component : myPanel.getComponents()) {
  if(component instanceof JCheckBox) {
    allSelected &= ((JCheckBox)component).isSelected();
  }
}

I'd recommend reading about Java arrays and collections before continuing

http://java.sun.com/docs/books/tutorial/java/nutsandbolts/arrays.html

http://java.sun.com/docs/books/tutorial/collections/index.html

Answer 2

Ummm, what should I say?

OK, You should starts by using array to hold all check boxes you have so you can loop through it.

In case that is too late, you may have a another choice by loop though all elements on that container (only work if all checkboxes are on the same container). Something like ' jPanel1.getComponents() ' and then loop them only see which is a Checkbox.

Anyway .. I think, you should put all those in an array and save yourself from a variable mess.

Answer 3

Well, if you have your checkboxes in an array... you can do it in a loop.

JCheckBox[] myBoxes = new JCheckBox[200];

//Some creation stuff here

for (int i=0; i<myBoxes.length; ++i) {
   if (myBoxes[i].isSelected()) {
       //Do stuff!
   }
}