To append to existing file use FileWriter with append = true argument in constructor: FileWriter fileWriter= new FileWriter(fileName,true); BufferedWriter bufferWriter = new BufferedWriter(fileWriter); bufferWriter.write(inputString); bufferWriter.close(); Read more about FileWriter here solved writing and reading a txt content using java
It is simple: Address = Address.concat(String.valueOf(i)); Address initailly had a whatever value: 5.20.86.0. In your for loop you are appending the i current value, but you don’t delete the previous value! So it is going to 5.20.86.012345678910 as 5.20.86. and 012345678910 than 012345678910 11 12 13 14 and so on. I hope it is a … Read more
You can inflate its views by doing: LayoutInflater inflater = (LayoutInflater)context.getSystemService (Context.LAYOUT_INFLATER_SERVICE); inflater.inflate(…); Alternatively, you can simply create a view like final LinearLayout l = […] //add stuff l.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); //etc… solved XML to Java code in Android [closed]
In this line: if(guess1 < nmbr); { the ; ends the if block early, causing the following else to not match any if, leading to a syntax error. Delete the ;. solved Why do I have the error “Syntax error on token “else”, delete this token” [closed]
Jackson provides many ways of reading this JSON. One simple way would be doing something like this: Map<String, Object> result = new ObjectMapper().readValue(“JSON_Input_Here”, Map.class); Additionally, you could do something like: JsonNode input = new ObjectMapper().readTree(“JSON_Input_Here”); I’m not sure how a map would handle a Json array, but the JsonNode object lets you check the type … Read more
Looking at your code it seems that you made a typo here: TextView DialogText=(TextView) findViewById(R.id.imageViewDialog); It should be TextView DialogText=(TextView) findViewById(R.id.textViewDialog); or whatever the name of the id for this TextView is. Apart from that, you need to learn to read the messages from the LogCat as they are often very informative. Cleary it says: … Read more
It is performing a bitwise or, based on your expecting output – I believe you wanted a xor. Like, int a = (4 ^ 6); outputs 2 solved Explain me ,binary | dont work (java)
You can do it using a Set. You need unique elements and Set gurantees you containing the unique elements. HashSet is implementation of Set, you can use it to implement this idea. public boolean ifAllCharsUnique(String input){ char[] arr = input.toCharArray(); int length = arr.length; Set<Character> checker = new HashSet<>(); for(int i =0 ; i < … Read more
There is a lot that can be improved in your code, let me add some comments public void add(String candidate){ //if candidate is actually null you are calling null.equals //which means this will always result in a NullPointerException //you can remove this if if you want if (candidate.equals(null)){ throw new RuntimeException(); } … //think about … Read more
Try this code, final Handler h = new Handler(); h.post(new Runnable() { @Override public void run() { long millis = (long) currentTime(); dateAndTime.setText(getDate(millis, “dd/MM/yyyy hh:mm:ss.SSS”)); h.postDelayed(this, 1000); } }); 4 solved android update textview for every 30 seconds [duplicate]
Look ma, no windows here, just us teddies… public class TestTrayIcon01 { public static void main(String[] args) { new TestTrayIcon01(); } public TestTrayIcon01() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { TrayIcon icon = new TrayIcon(ImageIO.read(getClass().getResource(“/SmallTeddy.png”))); SystemTray tray = SystemTray.getSystemTray(); tray.add(icon); } catch (Exception ex) { ex.printStackTrace(); } JDialog dialog = new … Read more
Use a RelativeLayout. onClick, loop over the existing imageview(s) and change the layoutparameters to move up the screen; otherwise, create a new imageview, set its src and initial position, and add it to your relativelayout. (If there is only ever one imageview at a time, you don’t need to create a new one, just move … Read more
its not disabling the tabs Why do you think making a panel invisible will disable a tab? If you want to disable a tab then take a look at the JTabbedPane API. Look at all the “setter” methods. You will find a method that allows you to disable individual tabs. solved I have these 5 … Read more
Calculate the hash values of your number values in your set and count the number of duplicate hash values. A simple implementation of this may be: List<Integer> yourValues = /* Your set of numbers */; Map<Integer, Set<Integer>> map = new HashMap<>(); // Insert all elements into buckets based on their hash value yourValues.forEach(value -> { … Read more
Fatal Exception: java.lang.ArrayIndexOutOfBoundsException length=12; index=12 on samsung device 6.0.1 android version solved Fatal Exception: java.lang.ArrayIndexOutOfBoundsException length=12; index=12 on samsung device 6.0.1 android version