Inserting a variable amidst another variable

问题

I have three textboxes ct1,ct2,ct3. I have to use a for loop 1 to 3 and check whether the textboxes are empty. So, inside the for loop, how do I represent it? For example,

for(i=0;i<=3;i++)
{
    if(ct+i.getText()) // I know I'm wrong
     {
     }

}

回答1:

I have three textboxes ct1,ct2,ct3.

There's your problem to start with. Instead of using three separate variables, create an array or collection:

TextBox[] textBoxes = new TextBox[3];
// Populate the array...

Or:

List<TextBox> textBoxes = new ArrayList<TextBox>();
// Populate the list...

Then in your loop:

// Note the < here - not <=
for (int i = 0; i < 3; i++) {
   // If you're using the array
   String text = textBoxes[i].getText();

   // or for the list...
   String text = textBoxes.get(i).getText();
}

Or if you don't need the index:

for (TextBox textBox : textBoxes) {
    String text = textBox.getText();
    ...
}

回答2:

Use an array

TextBox[] boxes = new TextBox[]{ct1,ct2,ct3};
for(i=0;i<3;i++)
{
    boxes[i].getText(""); // I know I'm wrong
}

回答3:

You can put your text boxes in a list and iterate over that list:

List<TextBox> ctList = new ArrayList<TextBox> ();
list.add(ct1);
list.add(ct2);
list.add(ct3);

for (TextBox ct : ctList) {
    if(ct.getText().equals("expected text")) {
        // do your stuff here
    }
}

来源：https://stackoverflow.com/questions/11775768/inserting-a-variable-amidst-another-variable