I have some buttons on named btnA1, btnA2, btnA3, btnB1, btnB2, btnB3, and so forth. I want to know how I can reference to them by combining variable values. For example:
String var1 = "A";
int var2 = 2;
btn[var1+var2].setText("foo"); // <- This line doesn't work. What do I use in place of this one?
Supposedly, the above code will reference to btnA2 but it doesn't work.
You can't do this in Java. But you can store your buttons in an array.
JButton [] arr = new JButton[6];
//add buttons in the array
btn[1].setText("foo");
Or in a Map :
Map<String, JButton> m = new HashMap<>();
m.put("A2", btnA2)
m.get(var1+var2).setText("foo");
You can't assign button name dynamically.
btn[var1+var2].setText("foo");//This is not possible in java
Alternatively design an array of JButton
JButton[] buts=new JButton[]{btnA1, btnA2, btnA3};
for(JButton but: buts){
but.setText("foo");
}
Best option for you would be a map:
Map<String, JButton> btn = new HashMap<>();
btn.get(var1+var2).setText("foo");
