java

[Solved] Java 8 calculate how many 1st of the months between two dates

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tl;dr LocalDate.parse( “2022-03-14” ).datesUntil( LocalDate.parse( “2022-04-15” ) ).filter( localDate -> localDate.getDayOfMonth() == 1 ).count() See this code run live at IdeOne.com. 1 Details First, parse the inputs as LocalDate objects. LocalDate start = LocalDate.parse( “2022-03-14” ); LocalDate end = LocalDate.parse( “2022-04-15” ); The LocalDate#datesUntil method creates a stream of LocalDate objects between the two values. … Read more

[Solved] Merge list of lists [closed]

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It can be done with a bit of recursion, provided you don’t have too many items in source and also don’t get a combinatorial explosion from how long each sublist is. import java.util.ArrayList; import java.util.List; public class AllCombinations { static void AddCombination(List<List<String>> source, int depth, String prefix, List<String> output) { for (String layer : source.get(depth)) … Read more

[Solved] How to get an attachment from specified path [closed]

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This is applicable when you want to read attachment from your local, If you want to read file from remote system or some other things there are different ways. String filePAthDB =”E:/Eclipse-Leo/RD_JMS/src/test/textfile.jpg”; File f = new File(filePAthDB ); if(f.exists()) { //process file whatever you want System.out.println(“Attachment available……”); } else System.out.println(“not Attachment available……”); solved How to … Read more

[Solved] Mysql java taking registration [closed]

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Follow the steps: 1. Download Mysql and Install+ dwnload mysql-connector jar file. 2. in the mysql(u can connect using mysql command line client) provide ur pwd and get ready. Put below code: 3. create database TEST 4. use TEST. 5. CREATE TABLE USER_DTLS (USERNAME VARCHAR2(100), PASS VARCHAR2(100)); creating tables 6. INSERT INTO USER_DTLS(‘user1’, ‘user1234’);INSERT INTO … Read more

[Solved] Split string using substring [closed]

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You can simply use split method from String class. Split file=android.txt&data=it contains android data on & to get array of “file=android.txt” and “data=it contains android data”. Then you can split each of this elements on = so file=android.txt -> file, android.txt data=it contains android data -> data, it contains android data So your code can … Read more

[Solved] Error: java.lang.NoClassDefFoundError

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I just compiled this code and it worked perfectly fine, It may be a issue when you are exporting it make sure you are exporting the file as a runnable JAR file, if you don’t it wont export the necessary documentation defining where the main class is. in Eclipse you can do this by going … Read more

[Solved] Extract Substrings using regex Java [closed]

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This regex will match all the data that are you asking: \(DT\s\w+.{3}NN\s\w+\) Where \(DT\s\w+ match the Determiner, thr white space and the string, .{3} match ) ( and NN\s\w+\) match the Noun, singular or mass. Using regexpal match the data but if you want use it in Java code you need to escape the charactes … Read more

[Solved] How to load data into array?

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Here are some hints: Code the class that is going to represent an inventory item. It needs field, getters (and maybe setters) and a constructor The declaration of the array will look like this: private NameOfYourClass[] inventoryItems The initialization can look like this = new NameOfYourClass[] { new NameOfYourClass(/* constructor arg list */), new NameOfYourClass(/* … Read more

[Solved] Working with two unknown integers

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public static void main(String[] args) { System.out.println(“sum: ” + sum(10, 12)); System.out.println(“evens: ” + evens(10, 20)); System.out.println(“odds: ” + odds(10, 20)); System.out.println(“primes: ” + primes(0, 100)); } public static int sum(int from, int to) { int sum = 0; for (int i = from; i <= to; i++) { sum += i; } return sum; … Read more