I think the reason is pretty clear. ints.forEach((i) -> { System.out.print(ints.get(i-1) + ” “); }); Translates approximately to: for (Integer i : ints) { System.out.println(ints.get(i – 1) + ” “); } Which will cause IndexOutOfBoundsExceptions because i refers to the elements of each list, and each of those elements – 1 will give an index … Read more
Before I answer you question, note that a void method can’t return an ArrayList. And to the question: They differ in the lock they acquire. In this case, the first one is an implicit lock on “this”. It’s a way to write public void getPlayers() { synchronized (this) { return list; } } Except that … Read more
BODMAS rule is used to evaluate the expression . d*b = 18 “+” and “-” have same precedence . But “-” comes first in the left. SO 100 – 18 = 82 And then 82 + 8 = 90. solved Precedence of basic mathematical operators
You don’t need FFMPEG, you can use the standard codecs available in android. public void playFile(String fileToPlay) { // see where we find a suitable autiotrack MediaExtractor extractor = new MediaExtractor(); try { extractor.setDataSource(fileToPlay); } catch (IOException e) { out.release(); return; } extractor.selectTrack(0); String fileType=typeForFile(fileToPlay); if (fileType==null) { out.release(); extractor.release(); return; } MediaCodec codec = … Read more
If you output the Date object directly, its toString function is called implicitly, giving you a string in the format dow mon dd hh:mm:ss zzz yyyy, which may or may not be what you want. Using DateFormat implementation lets you choose the date format that seems appropriate for your task. The method used in that … Read more
str.replace(“\\D”, “”); will remove all non-digit characters from the string, then you can just parse it: Integer.parseInt(str); solved how to convert a String value 512m into integer value 512? [closed]
When you pass a variable to a method it is copied. This means if you set that variable in the method it has no effect on the caller. i.e. it doesn’t initialise the callers copy of the variable. You need to change your code to look like this. shetatch = z1[i].shetach(length); The variable shetatch inside … Read more
There is a way, lots of ways one of these can be: String string = “I want this split up into pairs”; String[] words = string.split(” “); List<String> pairs = new ArrayList<String>(); for (int i = 0; i < words.length-1; ++i) { pairs.add(words[i] + ” ” + words[i+1]); } System.out.println(pairs); solved Get word pairs from … Read more
It doesn’t look like you’re properly saving the results of your string split. x.split(” “); returns a String[] with each of the pieces that were separated by ” ” e.g. String x = “1 x 2″; String[] split = x.split(” “); split[0] == “1”; split[1] == “x”; split[2] == “2”; You could probably benefit from … Read more
Why don’t you create the URL with the pos value directly ? You’ll avoid your if/else statements. It would be something like that int pos = getIntent().getIntExtra(“key”,0); String url = “file:///android_asset/”+pos+”.html” web.loadUrl(url); Ok it seems like you have different file names. So what you can do is store those in a Map. Map<Integer, String> map … Read more
The documentation here is wrong as far as I understand it. That limitation was changed in protocol version 3 (introduced in C* 2.1). From the native protocol specification under the changes section for protocol 3: The serialization format for collection has changed (both the collection size and the length of each argument is now 4 … Read more
What about adding a globally unique identifier (GUID)? A GUID is a 128-bit integer (16 bytes) that can be used across all computers and networks wherever a unique identifier is required. Such an identifier has a very low probability of being duplicated. In Java, it is called a UUID. For example: UUID uuid = java.util.UUID.randomUUID(); … Read more
String is immutable. so, sub.toUpperCase() doesn’t change the string internals. It just returns you a new string value that is uppercased: To uppercase sub, rather assign sub to the result of the toUpperCase() method like so: sub = sub.toUpperCase(); That way, you return a new uppercase string. solved Why you can’t just paste method to … Read more
Method: public static void main(String[] args) { String s = “(1,2)”; System.out.println(“x=” + s.substring(1, s.indexOf(“,”))); System.out.println(“y=” + s.substring(s.indexOf(“,”)+1, s.length()-1)); } Will give the following output: x=1 y=2 This will even work, if the numbers have more than one digit. 0 solved Extract co ordinates from string [closed]
Introduction DateFormat is an important tool for formatting and manipulating dates and times in Java. It is used to convert a date from one format to another, to parse a date from a string, to format a date into a string, and to calculate the difference between two dates. DateFormat is also used to validate … Read more