6,486 questions
0
votes
0
answers
11
views
JUnit test cases skipped for a specific class despite proper setup in Gradle and Java version
I am working on an end-to-end testing class for my Java project using JUnit 5. However, only the test cases in a specific test class are being skipped, even though other test cases in the project run ...
-1
votes
0
answers
37
views
Why is this throwing a NoSuchElementException? [duplicate]
This is part of a slightly bigger program. It takes input from a user and assigns that to values in an object. It doesn't make it past the first input before throwing an error. I've tried researching ...
0
votes
1
answer
70
views
Scanner.readLine() with custom line delimeter
I have a string that needs to be read using the Scanner class from the beginning to the \n character. The problem is that the source stream in my case may contain the character \u2028. I know that the ...
0
votes
0
answers
45
views
Scanner skipping .hasNextDouble() [duplicate]
I am trying to read several doubles from a file and save them in an array. The first number in the file is an integer, which should then determine the size of the array. This works. but when I try to ...
- 1
0
votes
0
answers
38
views
How take input while "message"/r in a loop
Hello I am not really sure how to word the title, But I am trying to build a blockchain for my first big project and I have 3 threads, a node/miner/wallet. When mining it is constantly printing out ...
0
votes
1
answer
50
views
How to get Java console scan 2 strings separated by TAB key
I cannot type the TAB key into the console for 2 strings separated by the tab key, i used the split method but it didn't work. The Java console does not accept the TAB key.
Here's a snippet of my code
...
- 3
0
votes
0
answers
20
views
Scanner doesn't take input after first round of the for loop [duplicate]
I want to run a block of code which repeats until user wants to exit themself. So I put it into a for loop where it'll keep iterating until user enters 0 as a choice. It works fine in the first ...
- 29
0
votes
0
answers
29
views
Why are my output values displaying E when they shouldn't be that long? [duplicate]
When running a program for calculating investor loans, my program provides an output of owner future value that is extremely long and contains an "E". I'm not sure if my formulas are wrong ...
- 11
-1
votes
1
answer
116
views
Java Scanner throws IndexOutOfBoundsException if an asynchronous thread is interruped while waiting on nextLine() and another nextLine() is called
What title says.
Java Scanner throws IndexOutOfBoundsException if an asynchronous thread is interrupted while waiting on nextLine() and another nextLine() is called.
Here is some code that reproduces ...
0
votes
0
answers
27
views
can anyone explain why the string input taken after integer input in java gives error [duplicate]
Why does attempting to take a string input after an integer input using Scanner in Java often result in unexpected behavior or errors? What are the underlying details of this problem?"
I ...
0
votes
0
answers
33
views
I encountered a strange problem while using Scanner in java. Its displays the phrase twice [duplicate]
Code
import java.util.Scanner;
public class sortirovka {
public static void main(String[] args){
int[] massiv = new int[10];
Scanner cons = new Scanner(System.in);
for(int ...
- 1
0
votes
1
answer
70
views
how to use ? and : expression in java
I want to use ? : expression instead of if with 4 conditions in this code but i dont know how< any answers please?
import java.util.Scanner;
public class Ex13 {
public static void main(String[] ...
-1
votes
1
answer
139
views
How to populate an array automatic with an user` input?
i m writing a code as homework, the task is to create a code, where the user give a number (for example 4 ) and the output will be all the number from 4 ( the users input ) till the length of array (...
- 1
0
votes
0
answers
20
views
how take two string input from user [duplicate]
import java.util.Scanner;
public class userInput {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner obj = new Scanner(System.in);
...
1
vote
2
answers
119
views
Running a console application (CLI) from docker-compose
Have java code:
public class Hello {
public static void main(String[] args) {
System.out.println("Enter Name");
Scanner reader = new Scanner(System.in);
String s ...
-1
votes
1
answer
109
views
Why isn't "\n" interpreted as newline character when a String like, "abc\nabc" is given as input via Scanner class in Java?
In Java, when we try to print a Hardcoded String like, "abc\nabc", we observe a line change after the first abc but when we take same input via sc.next() or sc.nextLine() it prints out '\n' ...
0
votes
0
answers
38
views
Inputs from console do not become String in program through nextLine
I am making a program that first asks the user to input a number from the console to choose which umber type they'd like to convert to the other two, after which the user enters a number in the form ...
0
votes
1
answer
300
views
SIGHUP error handling, exception throws in Scanner class how can I fix this problem?
import java.util.*;
class GFG {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
String name=sc.next();
System.out.println("No ...
- 1
-1
votes
1
answer
55
views
Using System.in to process piped in data AND to await user input
I have a program in java that I would like to be able to attend to piped in data (as in, '(echo "dor = 4"; echo "dor * 2") | program'. That said, it seems System.in only works as ...
0
votes
1
answer
63
views
Scanner.next() doesn't read the first character in every second line
The following inputs are supplied to this piece of code:
5
0 4 15
1 0 14 2 7 3 23
2 0 7
3 1 23 4 16
4 2 15 3 9
The problem is that whenever the line number is odd, the first integer will not be read ...
- 13
-1
votes
1
answer
244
views
Assigning Hex Values from String to an Integer variable
Context: Java 22
I'm trying to read data from a table that includes both Hex and Dec values in a CSV. These values would look something like this:
0x00000000,0
0x03000000,1
0x05000000,2
What I'm ...
0
votes
2
answers
73
views
how to sort input from java scanner? [closed]
I am working on a simple project in Java which need to take in a string through a Scanner object and then sort out the inputs which can be integers.
These then need to be fed in pairs to run the ...
1
vote
2
answers
55
views
How can the scanner reread the entire file after it has already executed hasNextLine once?
What is the optimal way for the scanner to reread the contents of the file from the beginning? Since in the verticesSet function, I'm using while (scanner.hasNextLine()), which reads until there are ...
- 15
-2
votes
1
answer
95
views
Why does the scanner still run even though expression equates to false [duplicate]
I've come across an issue with my scanner functionality. Even after entering "exit" in the terminal, the scanner keeps running. My suspicion is that this behavior is linked to the ...
- 82
0
votes
0
answers
49
views
NoSuchElementException at java.util.Scanner.nextLine
My program encountered a runtime exception while attempting to read a file using a Scanner.
Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util....
0
votes
0
answers
22
views
Issues with sc.next and sc.nextLine in java: sc.next means i cannot have multi-worded inputs; sc.nextLine consumes the first input in a for loop [duplicate]
The issue is, when i use sc.nextLine in the code (in the line I marked) the for loop consumes the first input and then accepts the others. Using sc.next instead fixes this issues but I cannot accept a ...
-1
votes
1
answer
62
views
My program recurses. Is there a way to fix this?
My problem is that whenever I try to catch the exception on "scannerGettingStarted", I always get the try catch exception from runProgram. I know that there is a recursion that is happening, ...
- 11
1
vote
1
answer
67
views
How to make it so my program doesn't ask for input twice?
I'm using the Scanner class in Java and I ran into an issue where my program would do something like this:
public static void answer() {
System.out.print("\t> ");
command = scan....
0
votes
0
answers
25
views
How to reiterate while loop containing scanner in order to restart code in java? [duplicate]
Basically the issue is that once the main method completes, it prompts to restart the code or not, except it terminates after prompting, no matter what I enter. How do I fix this?
import java.awt....
- 1
0
votes
1
answer
18
views
How to do this for loop properly?
How do I do this properly for loop properly?
Ask the user for their name.
Ask the user for the number of times to print their name and save this to an int
variable called n.
Create a for loop that ...
- 21
0
votes
0
answers
17
views
scan.nextLine() does not work after scan.nextDouble() in java [duplicate]
I want to take 3 inputs of an integer, double and string, so i wrote the following 3 lines:
Scanner scan = new Scanner(System.in);
int i = scan.nextInt();
double d = scan.nextDouble();
...
- 1
0
votes
0
answers
39
views
Passing a scanner as a perameter to a Java Method
I'm fairly new to programming and newer still to Java.
I'm trying to write some code that will take input from a user and create a new object (instance?) from it. The concept is adding and updating a ...
1
vote
0
answers
26
views
Why is Scanner.nextLine not running the second and third times? [duplicate]
I have a program that is supposed to give a user three chances to get a password before it locks them out, but the code is only correctly getting the password on the first attempt.
import java.util....
- 19
0
votes
0
answers
30
views
Console app runs diffrently than in netbeans
I made a small card based game in Netbeans. I went to build and test it in the console and it prints eveything twice before the user get to input there move. It does not do it in Netbeans. I am using ...
- 1
4
votes
1
answer
90
views
It gives error since I closed the scanner in main method but I created a new scanner in the method [duplicate]
i tried to creating a new scanner after i closed the former in the main. but it gives error.
i thought that i created a new scanner in the method than i closed it so it would read the new inputs ...
- 43
0
votes
2
answers
113
views
use of hasNext() and hasNextInt()
As the hasNext() returns True when there is a token in buffer otherwise false And hasNextInt() return true if the token in buffer can be interpreted as int otherwise false.
If in case, the buffer is ...
- 1
0
votes
2
answers
89
views
File not found when trying to pass user given file to new scanner object
public void readItemData()
{
try {
Frame frame = null;
FileDialog fileBox = new FileDialog(frame ,"Open", FileDialog.LOAD);
fileBox.setVisible(...
0
votes
0
answers
130
views
Why do I get a java.util.NoSuchElementException
I am practicing some algorithm problems. While I use Scanner to get some input, my program throws a java.util.NoSuchElementException in thread "main", and I really don't know why. It can ...
0
votes
2
answers
113
views
How to get a String and an int vs. just a String with Scanner?
I have some code that runs an addition or subtraction of two numbers based on a user's input, wherein they can either type a String followed by an integer to perform an operation, OR just a String to ...
- 3
-2
votes
1
answer
109
views
Can we skip EOF when reading input? [closed]
After I catch eof, if I try to read information from input again, I no longer get new information. Is there any way I can resume reading the data?
Scanner s = new Scanner(System.in);
while (s....
- 1
0
votes
0
answers
23
views
Correct reading from console in the same line with request [duplicate]
I'm trying to write request, which user can see in console and in the same line he can give response, but I have some issues with that.
import java.util.Scanner;
public class Main {
final static ...
- 25
-1
votes
1
answer
69
views
Use a scanner alongside a Throttle class
I have a project where we have a used a Throttle class and MainClass. We have to now create a new while loop that prompts the user for the position data, using a scanner, from 0 to 6.
When the user ...
0
votes
0
answers
20
views
Why is an empty string assigned to a variable "text" first and only then is the entered value assigned? [duplicate]
I see that using the "hasNextInt()" method assigns an empty string to a variable "text" first and only then the entered value. Why is that?
Input:
15
enter
Output:
15
false
15
...
- 1
0
votes
0
answers
32
views
Why does this simple java array program skip the first input? [duplicate]
When I try to run this simple java program that asks how many words you would like the array to contain and asks you to enter a word at each index in the array, it skips the first input and prints &...
- 1
0
votes
0
answers
42
views
NoSuchElementException when using Java.Util.Scanner in console app
I am new to Java and I am doing hospital software in console app. I got a class to select options.
The exception is thrown only when option 2 is selected. I don't want the code to stop, but continuing ...
- 1
4
votes
2
answers
93
views
Can I skip a delimiter without repeating it in Kotlin/java.util.Scanner?
Consider a string like
"1: 2, 3, 4"
^^ ^^^^^^^
id items
I can parse this using
val sc = Scanner("1: 2, 3, 4")
val id = sc.useDelimiter(": ").nextInt()
val items = sc....
- 14.3k
0
votes
1
answer
63
views
Java while loop not breaking when using HasNextLine()
I know that there's similar questions, but my while loop times out when using HasNextLine() and none of the solutions online have fixed it so far.
public static main(String [] args) {
Scanner s = ...
-1
votes
1
answer
61
views
Problems when using Mockito and JUnit for testing in Java Project
I have some problems when testing with mockito and JUnit, I want to test a method that take data from user input. When I use String id = "E833462", the test function work correctly, but when ...
- 35
0
votes
0
answers
37
views
Why does hasNext() wait for input? [duplicate]
In this simple code, I'm checking if a Scanner has something in the input buffer or not. So I used hasNext() to check whether it has something or not. But instead of returning "false" (in ...
- 31
-1
votes
2
answers
77
views
Scanning the next line, but only to a certain length
I have an existing code, where I have to scan the next sentence that the user types into the console. This sentence can be no longer than 99 characters. My current code takes the .nextLine() method, ...
- 37