Java – get button name from actionlistener?
I have browsed the Internet, but I can't find the answer
I am using the for loop to create 36 buttons called A1, A2, etc., and assign a unique action command to each button at the same time
Later, I want to get the name of the button from the actionperformed (ActionEvent E) method
I can make actioncommand simple enough, but I also need the name of the button
Any help a lot appitecaited!
Edit:
This is the code I'm using:
String letters[] = {"0","a","b","c","d","e","f"}; JButton btn[] = new JButton[35]; int count = 0; for (int f=1; f < 7;f++){ for (int i=1; i < 7;i++){ btn[i] = new JButton(letters[f]+i,cup); System.out.println(btn[i])); mainGameWindow.add(btn[i]); btn[i].addActionListener(this); String StringCommand = Integer.toString(randomArrayNum()); btn[i].setActionCommand(StringCommand); count++; if(count == 18){ generateArray(); } } }
This is 6 × The 6 grid provides 36 buttons, namely a1-6, b1-6, C1-6, etc
Once I create a button in this way, I seem to have no control over the button. I can't assign an icon or get the name of the button
Thank you in advance
Solution
Keep the reference of the button in the map
String letters[] = {"0","f"}; JButton btn; int count = 0; HashMap<String,JButton> buttonCache = new HashMap<String,JButton>(); for (int f=1; f < 7;f++){ for (int i=1; i < 7;i++){ btn = new JButton(letters[f]+i,cup); mainGameWindow.add(btn[i]); btn.addActionListener(this); String stringCommand = Integer.toString(randomArrayNum()); btn.setActionCommand(stringCommand); buttonMap.put(stringCommand,btn); count++; if(count == 18){ generateArray(); } } }
Then, in actionlistener, get the button from the command:
public void actionPerformed(ActionEvent e) { String command = ((JButton) e.getSource()).getActionCommand(); JButton button = buttonCache.get(command); if (null != button) { // do something with the button } }
edit
Answer this again five years later. I don't know why I suggest using HashMap: P
This code is exactly the same. There is no third-party map:
String letters[] = {"0","f"}; int count = 0; for (int f=1; f < 7;f++){ for (int i=1; i < 7;i++) { String stringCommand = Integer.toString(randomArrayNum()); Button btn = new JButton(letters[f]+i,cup); btn.setActionCommand(stringCommand); btn.addActionListener(this); mainGameWindow.add(btn[i]); // NOTE : I have no idea what this is for... count++; if(count == 18){ generateArray(); } } }
In actionlistener
public void actionPerformed(ActionEvent e) { JButton button = (JButton) e.getSource(); String command = button.getActionCommand(); // do something with the button // the command may help identifying the button... }