Stack Overflow
Stack Overflow

Questions tagged [bluej]

BlueJ is a popular Java IDE aimed at teaching the principles of object oriented programming.

BlueJ is an open source platform written in Java that's especially aimed at beginner developers. It presents items to the user in a much more easy and intuitive format than more comprehensive IDEs such as Netbeans or Eclipse, helping people get started quickly and easily whilst also understanding what's going on.

Download

The latest version of BlueJ is available from the download page, here.

Useful Links

1065 questions
-3
votes
2 answers

Faced BlueJ Java questions

"What is the format of the first line of a method?" It is depends on the developer design right? But somehow, but how am I to write a proper answer other than mine. "How can you view javadoc for a class?" This is the most difficult question that i…
Jack Wong
  • 33
  • 5
-3
votes
3 answers

Pattern in java using numbers

I am trying to print the following pattern but don't get the logic how to.. Can you please help me out.. I am using BlueJ and this is my first question so I am not sure what is required. 1 2 2 3 3 3 3 …
Anirudh
  • 11
  • 1
  • 1
  • 7
-3
votes
1 answer

ArrayList (beginner )

So I am trying to do this assignment on ArrayList for the first time and am stuck with a error message that I am not sure how to deal with. So first I build a class called ArrayList: some of the code for that is as follow:- public class ArrayList { …
Neha
  • 1
-3
votes
4 answers

An error in my codes. I cant find that

import java.io.*; import java.util.Scanner; public class Helloworld{ public static BufferedReader input=new BufferedReader(new InputStreamReader(System.in)); public static void main(String[]args) throws IOException{ …
Christian Lumugdan
  • 19
  • 1
  • 8
-3
votes
1 answer

Class, interface, or enum expected when compiling

I sat down and tried to write code for this prompt, and I made this. However, when I compile it in BlueJ, I get: class, interface, or enum expected. 1) How do I fix this error? It seems like I forgot something, but I cant remember what I forgot. 2)…
AndrewAustin
  • 55
  • 1
  • 7
-3
votes
3 answers

How to find the number of a specific element in an arraylist in Java (blueJ)

I have and array list and in that array list there are 5 elements called pound and 3 called penny. How can I calculate the number of times that pound occurs in the array list
Daniel Watson
  • 13
  • 1
  • 4
-3
votes
1 answer

Java "cannot find symbol- variable totAMTpizza'

I am trying to make a simple program in java by BlueJ. But while compiling it gives me a error that "cannot find symbol- variable totAMTpizza". Anyone with the fix.
Rishik Tiwari
  • 3
  • 3
-3
votes
2 answers

Incorrect Output Error by Rachit Bhargava

I have made a program for question: Write a program in Java to input first name, middle name and last name. Validate the digital signature that contains first name and last name. If the signature doesn't contain any of these, print "Invalid…
Rachit Bhargava
  • 160
  • 1
  • 12
-3
votes
5 answers

how to generate a unique random number?

when storing to student may happen to have the same id, so how can i avoid the duplication, I have tried the while loop and the for each loop but it did not work public void addStudent(Student student) { student.setId(ganerateNewRandom("aa",…
Ghassar Qhasar
  • 75
  • 1
  • 11
-3
votes
2 answers

Use while loop to add many objects to arraylist

Taking an intro course to Java, using BlueJ. Have two objects, and object called account with relevant details and an ArrayList called bankAccounts containing accounts. I am tasked with adding multiple accounts to bankAccounts using a while loop. …
HandsomeRob
  • 435
  • 2
  • 7
  • 14
-3
votes
1 answer

Java Programming: Compiler error, class interface, or enum expected in main(String[] args)

I'm in the process of creating a backgammon game. To start with I am just trying to put in a main method so that I can put in some psuedo code ready to be turned into real thing. However whenever I try and compile my present code I get a compiler…
user1845855
  • 11
  • 1
  • 1
-4
votes
0 answers

Can someone please help convert my random insult generator to be suitable for BlueJ?

//code var randomBodyPart = ['face', 'nose', 'hand', 'chin', 'foot', 'leg', 'lips' 'head']; var randomAdjectives = ['ugly', 'smelly', 'crude', 'scary', 'big', 'hairy', 'majestic', 'small', 'radioactive']; var randomWords = ['sponge', 'rat',…
George
  • 1
  • 1
-4
votes
4 answers

Solving for N=N+1 Java algorithm

I have this sequence : 8, 9, 11, 14, 18, 23, 29, 36, 44, ... I have to write a method that calculates n numbers according to this rule and outputs them to the console. The nth number is to be returned. n is passed to the method as a parameter. If n…
Abraham Martinez
  • 1
-4
votes
1 answer

How can I make my program only input specific words, if anything other than said word is entered, retry input

I want to make a registration program. So there is 5 enrollments possbiel, lets say music, English, history, sports, photography. I want to make it so it will ask the user to enter to enroll into only 3 units out of the 5 options listed above. only…
SkinnyFatGuy
  • 1
  • 2
-4
votes
1 answer

Reverse a line that has multiple values

I am working on a program that allows the user to input an integer, double, character, and a string. I have used variables to store the numbers in I am using BlueJ as my IDE, and my question is how I can reverse a system.out.println line that has…
NightCode
  • 29
  • 5
1 2 3
…
70 71