CODEWITHSUNDEEP
javastringswingobject
Max Collao
Max Collao

Reputation: 101

how to use an instantiated object by its string name in java?

I'm writing a swing application in java and I have 10 jPanel with 10 jCheckBox in each one. The names of the jPanels are jPanel1, jPanel2, etc; and the names of the jCheckBox in jPanel1 are jCheckBox1_1, jCheckBox1_2, jCheckBox1_3, etc, and similar for the others jPanels. In a moment I need to know which of those jcheckboxes have been checked by the user so I do this

    boolean[] selected=new boolean[100];

    for(int i=0; i<selected.length; i++)
        selected[i]=false;

    if(jPanel1.jCheckBox1_1.isSelected())
        selected[0]=true;
    if(jPanel1.jCheckBox1_2.isSelected())
        selected[1]=true;
    if(jPanel1.jCheckBox1_3.isSelected())
        selected[2]=true;

and continue with the rest

I should do this way because I use the jCheckBoxes (for seeing if they are checked) in a jFrame, not in their jPanels. The problem is that I have to write a lot of repetitive code, and I think that is not intelligent. So I wonder if I can "recover" those objects and use them by their String names. For example:

String[] name=new String[100];
JCheckBox[] checkbox=new JCheckBox[name.length];
for(int i=0; i<100; i++){
    int num_panel=i/10+1;
    name[i]="jPanel"+num_panel+".jCheckBox"+num_panel+"_"+(i%10+1);
}
//and now use those names to ask if those jcheckBoxes are checked
boolean[] selected=new boolean[100];
for(int i=0; i<100; i++){
if(name[i].isSelected()) //but this isn't right because its a String, not a jCheckBox
    selected[i]=true;
else
    selected[i]=false;
}

So I would like to know if you know any way how I can use those jCheckBoxes by their string name. I know that I could have created them programatically as an array and everything would be easier, but other problem is that because its a swing gui, it's so hard to design them programatically. Thanks in advance.

Upvotes: 0

Views: 239

Answers (1)

jzd
jzd

Reputation: 23629

Two solutions:

  • First option, attach actionListeners to each checkbox to report to the control of the application that the box was checked when it happens. (Or Unchecked).
  • Second option, modify your attempt to use an array of checkboxes and just use that array directly to reference the checkbox instead of a second array of Strings.

Upvotes: 2

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