Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [java]

This challenge is related to the Java language. Note that challenges that require the answers to be in a specific language are generally discouraged.

0
votes
0answers
92 views

Count the score of a Code Golf code [duplicate]

My challenge is to make a Java method(s) that is given a String (another code in Java), removes any unnecessary characters, counts and returns the score, and displays the cleaned-up code in a way that ...
32
votes
29answers
7k views

Dollar Bill Auction

This is a KOTH challenge for the dollar bill auction game in game theory. In it, a dollar is being sold to the highest bidder. Bids go up in increments of 5¢, and the loser also pays their bid. The ...
35
votes
4answers
2k views

Splix.io - King of the land

You are an enterprising dot who wants to increase the land under its control. This is quite simple - travel outside your current land and loop back into your land and everything in that loop is now ...
5
votes
0answers
159 views

Golf this AP CS Java FRQ - Duplicate Sums of Arrays in 2D Array [closed]

In preparation for the AP Computer Science AP Test (Java), our teacher has been giving us FRQs from previous years for practice. My friend and I were golfing this during class today and got it as ...
6
votes
1answer
687 views

Minesweeper Wars [closed]

We've had problems to generate minesweeper games. We've had problems to solve these minesweeper games. Now... It's time to battle other people on a minesweeper game! Your program must be run in Java....
-5
votes
2answers
441 views

Shortest program to throw NullPointerException in Java

I find NullPointerException to be interesting since there are no explicit pointers in Java. Here is a program that throws such an exception. ...
-4
votes
2answers
756 views

Checking String for enum in Java [closed]

Write a Java method to check if a given string matches any value in a given enum. Your method will take two parameters, one a string and one an enum, and return ...
43
votes
19answers
2k views

Battle of the Fellowships KotH

In this challenge, you are going to create a Fellowship with the goal of defeating all other fellowships in battle. A fellowship (team) consists of 3 characters. Each character moves independently ...
15
votes
3answers
819 views

Java Asterisk Rectangle [closed]

For my CS class, my instructor has given us the assignment of creating a rectangle made of asterisks with diagonal lines drawn through it in Java. He also told us to write it in as few bytes as ...
4
votes
3answers
557 views

King of the Torus!

King of the Torus! Your job is to conquer the torus, but wait, there are multiple other players banded together in teams facing you! You will need to use your wit's to conquer the torus. There are ...
2
votes
1answer
580 views

Translate Java methods to fields

So, recently, I found myself reformatting my code for Vitsy to using anonymous class instances for commands rather than the normal method approach. For those who don't know, anonymous class instance ...
23
votes
7answers
4k views

King-Pen! (Dots and Boxes)

This is a king of the hill challenge for Dots and Boxes (aka Pen the Pig). The game is simple, on your turn just draw a line on an empty fence. Every time you complete a square you get a point. Also, ...
25
votes
14answers
2k views

Code Bots 4: Functional Programming

sheesh, is this really the 4th? For all you oldcomers, the core challenge is the same, but we are using Java instead of a custom language. Here are the past three CodeBot challenges, in case you are ...
20
votes
12answers
1k views

Connect-n time!

https://en.wikipedia.org/wiki/Connect_Four Does anyone remember the 2 player game connect 4? For those who don't it was a 6x7 board that stands vertical on a surface. The goal of connect 4 is to, ...
50
votes
28answers
8k views

You are the Weakest Link, Goodbye

This king-of-the-hill challenge is based off of the game show, Weakest Link. For those unfamiliar with the show, the crux of this challenge deals with who you vote off: If the other players are ...
19
votes
10answers
2k views

Coin Tossing Time Travelers

In the future when Time Travel (abbreviated as TT) will be common, coin tossing will become a serious mind-sport. To prepare for the future we create a competition for programs where time traveling ...
6
votes
5answers
1k views

Remove Whitespace from a Java Program [closed]

In this challenge, you will be given the source code of a Java program. Your task is to write a function or full program that will remove the whitespace from this program. The whitespace-removed ...
8
votes
2answers
2k views

What is the shortest infinite loop statement in Java?

I'm working on a golf for Java and I need an infinite loop. Obviously, I don't want to spend any more bytes than I have to, especially in such an expressive language. Assuming I have some code I want ...
7
votes
0answers
792 views

Tricky interview puzzle: get longest sequence by flipping 1 bit [closed]

A friend of mine got this question during an interview. The interview ended with no luck for him, but still, we're very curious to hear the solution. The question is as follows: Modify the code below ...
12
votes
5answers
2k views

Risk, the Warlight Way

Introduction In this game, players use their armies to fight other players' armies, capture territories, and become the last man standing. Each turn, players receive a base number of armies to use at ...
11
votes
11answers
920 views

Rocket Bots KOTH

Rocket Bots The year is 3024. People have become too scarce a resource to risk in war, so combat has shifted to the robots. Your task is to construct a bot like no other, who's rockets will rain ...
10
votes
7answers
937 views

Simple Pazaak (Star Wars Card Game from Knights of the Old Republic)

Pazaak is a card game from the Star Wars universe. It is similar to BlackJack, with two players pitted against each other trying to reach a total of twenty without going over. Each player has a "side ...
22
votes
9answers
2k views

King of the Hill - Liar's Dice

Liar's Dice is a fairly simple dice game. I've seen a few different variations of the rules, but here is the version I'm most familiar with: Each player starts with 5d6 Except when tallying the dice ...
22
votes
12answers
1k views

The Great Wumpus Hunt

COMPLETE Wumpus season has ended, and with, the lives of many a vicious Wumpus and brave Hunter. As well as some cowardly, immoral and downright stupid Hunters. But at the end of the day, ...
17
votes
9answers
835 views

Asymmetrical KOTH: Catch the Cat (Catcher Thread)

Asymmetrical KOTH: Catch the Cat UPDATE: The gist-files are updated (including new submisisons) as the Controller.java did not catch Exceptions (only errors). It does now catch errors and exceptions ...
14
votes
9answers
872 views

Asymmetrical KOTH: Catch the Cat (Cat Thread)

Asymmetrical KOTH: Catch the Cat UPDATE: The gist-files are updated (including new submisisons) as the Controller.java did not catch Exceptions (only errors). It does now catch errors and exceptions ...
37
votes
20answers
3k views

Strategic Voting, The Game

One of the most common voting systems for single-winner elections is the plurality voting method. Simply put, the candidate with the most votes wins. Plurality voting, however, is mathematically ...
0
votes
2answers
361 views

Java Package Correction

I have a lot of java projects and I am often making new ones. I have a few helper classes (Vector, Logger, etc.) and it takes a lot of time correcting the first line to the correct package, I would ...
6
votes
7answers
1k views

King of the Hill: Robot Battle

Your task here is to write an AI for a simple robot battle. The class to be implemented is provided at the bottom of this post, and source of the controller can be found here. Requirements Write a ...
29
votes
6answers
3k views

That's BS! (card game)

BS is a card game where the object of the game is to lose all of your cards. A game consists of four players and a 52-card deck. Each player is randomly dealt 13 cards. Normally, cards are labeled 2 -...
12
votes
8answers
953 views

Water Balloon Wars

This king-of-the-hill game is a strategy game in which you must throw around a water balloon and avoid getting splashed by water. The goal is to obtain the most points. You will be given a map of the ...
19
votes
8answers
20k views

Shortest code to throw IllegalArgumentException in Java

Okey, we all know the normal way to throw a IllegalArgumentException in Java: throw new IllegalArgumentException(); // 37 characters But there must be a shorter (...
24
votes
9answers
2k views

Chess Tournament

This is a chess-KOTH with simplified rules (because chess itself is already complicated, playing it via a simple program doesn't make it easier). At the moment it is limited to java (version 8), but ...
95
votes
44answers
10k views

Survival Game - AlienWar

AlienWar This game takes place in a very crowded planet where aliens are the superior race. Your task is to create your own alien and beat all other. The Board It is a 2 dimensional board. The ...
16
votes
5answers
1k views

reach catch when everything in the try block is caught already

This is limited to Java and C# by the syntax I guess. In this programming puzzle, you are to produce Exceptions that can be caught but are thrown again at the end ...
233
votes
56answers
45k views

Survival Game - Create Your Wolf

The Board The Board is a two dimensional array of cells. Cells are populated by Animals. Every day, all Animals on the Board simultaneously make one move. If two or more Animals move to the same cell,...
3
votes
1answer
796 views

Flip the commented-out code [closed]

This puzzle works for any programming language that has the same // single-line and /* ... */ multi-line comments that C++, C# ...
-2
votes
3answers
9k views

Write a program to print squares of integers up to 25 in java without using variables? [closed]

I asked this question on programmers 10 days back but wasn't able to get the answer that I wanted. Write program in java to print the squares of first 25 integers(1-25) without using any variables. ...
17
votes
3answers
2k views

Write a java code to detect the JVM version

The objective is to write java code that detects the JVM version relying in compatibility changes, side effects, bugs and/or undefined behavior that works in a way in one version and another way in ...
5
votes
6answers
2k views

RPN calculator without pointers

Me and some other students were at a bar discussing programming languages, in particular the C programming language. At some point a first year student said he didn't need no damn pointers. Another ...
81
votes
38answers
18k views

Tips for golfing in Java

Are there any useful shortcuts that can be used in Java? As shown below, import already adds at least 17 characters to a program. ...