I was trying to convert a list of Integers into a string of comma-separated integers. Collectors.joining(CharSequence delimiter) – Returns a Collector that concatenates the input elements, separated by the specified delimiter, in encounter order. I am getting an error in line number 8: The method collec…
Tag: integer
How to declare a numerical variable in java that is to hold a digit value with a fixed length of 3 digits always.
How to declare a numerical variable in Java that is to hold a digit value with a fixed length of 3 digits always. That is if i input 0, it should be formated to 000, if i input 31 then it should be formated to 032 and if i input 100 then it should remain 100. I need this for
How to check if a string is ‘float’ or ‘int’
I have a string, and I know that it only contains a number. How can I check if this number is int or float? Answer There are many ways to solve your problem. For example, you can use try{}catch(){}: Solution 1 Solution 2 Or you can use regex [-+]?[0-9]*.?[0-9]+: For more details, take a look at Matching Float…
Returning result of count native query using EntityManager in Java?
I have the following SQL Query : I am trying to write this in java : However I get this exception: How can I solve this? Answer You can also use Number and call intValue():
Is there a default type for numbers in Java
If I write something like this Which type has the ’18’? Is it int or byte? Or doesn’t it have a type yet? It can’t be int, because something like this is correct: And this is incorrect: EDIT: I think I found the right part in the spec at Assignment Conversion : The compile-time narrowi…
String.valueOf(Integer) always return 1
I’m trying to parse String “2 2 2” and add every symbol ‘2’ in ArrayList. This is my code: I can’t understand why System.out.println(String.valueOf(myIntArray.get(rawSize)));always return 1 ? UPDDATE: I try read file, which contain next text: Here is my Main function: publi…
How to read multiple integer values from one line in Java using BufferedReader object?
I am using BufferedReader class to read inputs in my Java program. I want to read inputs from a user who can enter multiple integer data in single line with space. I want to read all these data in an integer array. Input format- the user first enters how many numbers he/she want to enter And then multiple int…
Sum with Integer object if not null
I do not know if it is possible in Java but I need a method to do a special “add function”. Let me explain, SHORT VERSION: Is it possible to add an int with an Integer object? I need a method to check if that integer object exists, and add 0 if the object is null, add the correct value
Why int j = 012 giving output 10?
In my actual project It happened accidentally here is my modified small program. I can’t figure out why it is giving output 10? public class Int { public static void main(String args[]) { …
Java – how to convert letters in a string to a number?
I’m quite new to Java so I am wondering how do you convert a letter in a string to a number e.g. hello world would output as 8 5 12 12 15 23 15 18 12 4. so a=1, b=2, z=26 etc. Answer Since this is most likely a learning assignment, I’ll give you a hint: all UNICODE code points