@So I personally faced some issues when i am in a competitive programming environment especially when i wanted to test different test cases so i as a python dev switching to JAVA (as dsa route gives much faster edge in understanding different perks of java … but that would be for another day) i wanted the setup which i used for when i was doing my CP in python
hence I set it up and wanted to provide for community (a very simple setup to just have a inputs.txt file and output.txt file so that it gives you the freedom to not retype everything again and again
<h1>You can see the file structure i used in this below image for reference !</h1>
<img src="https://media.daily.dev/image/upload/s--3fzdsKwE--/f_auto/v1733125972/ugc/content_a28cd4a1-5da7-48a5-ad7f-d2d7a2a0872d" alt="image">
A setup like this comes in handy !
<h1>Replicate this</h1>
<h2>have a project a simple folder is enough</h2>
<h3>create these file input.txt output.txt handleInputs.java</h3>
<h3>Put this inside handleInputs.java</h3>
<pre><code class="language-java">package &lt;folder_name / package_name&gt;;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

public class handleInputs {
 public void processInputs(String inputFile, String outputFile){
 try{
 System.setIn(new FileInputStream(inputFile));
 System.setOut(new PrintStream(new FileOutputStream(outputFile)));
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
}
</code></pre>
now you are good to do create a file by putting them in new folder or just like that does not matter (somefile.java)
i have used this example here
<pre><code class="language-java">package cci.arrays;

//input packages
import cci.handleInputs;

// java pakcages
import java.util.Scanner;


public class isUnique {
 public static void main(String[] args) {
 
 // initializing the handler (you can use a method to remove this stuff)
 handleInputs hI = new handleInputs();
 hI.processInputs(&quot;cci/input.txt&quot;, &quot;cci/output.txt&quot;);
 
 Scanner scanner = new Scanner(System.in); // reads directly from input.txt
 String input = scanner.nextLine(); // for basically parsing multiple lines
 
 boolean unique[] = new boolean[128];
 for (int i = 0; i &lt; input.length(); i++) {
 int ascii = (int) input.charAt(i);
 if (unique[ascii]) {
 System.out.println(&quot;False&quot;); // prints directly to output.txt
 return;
 }
 unique[ascii] = true;
 }
 System.out.println(&quot;True&quot;); // prints directly to the output.txt
 scanner.close();
 }
}
</code></pre>
Why go to this extend when i can simply parse ?? … well if you are doing around 5 to 10 questions a day and there are more test cases at different types and you really dont know a good workaround then this is quite the useful store out there !!
If you have any questions feel free to ask or drop any suggestions which you want to see next !

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The post provides a simple setup for Java competitive programming, designed to handle multiple test cases efficiently. It includes instructions on creating an input.txt file and output.txt file, and a Java class to manage input and output streams, allowing for streamlined testing of different scenarios without retyping. An example implementation shows how to check for unique characters in a string by reading from the input file and writing results to the output file.

Java competitive programming setup !!!

I would suggest to use Jetbrains Intellij, which is good IDE for java and that class names(handleInputs ,isUnique ) does not look follow the naming convention
<a href="https://www.oracle.com/java/technologies/javase/codeconventions-namingconventions.html" target="_blank" rel="noopener nofollow">https://www.oracle.com/java/technologies/javase/codeconventions-namingconventions.html</a>
Intellij probably will put yellow lamp on those names and help you to fix it quickly, so they should be <code>IsUnique</code> , <code>HandleInputs</code>
Btw classes has responsibilities more then one and they mostly named related to domain, so IsUnique sounds too generic, instead you would see <code>ProblemSolver</code> or <code>Solution</code> class who hass the solution in it.
In intellij there are many shortcuts, you can use <code>sout</code> to write System.out.println i helps 🤓

I like the simplicity! To make it even faster, you could use a static block in the input class, so you wouldn’t need to instantiate handleInputs every time