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  3. Post

Random String Outputting "Hello World"?

Emma Brown
admin
#java #programming #java-programming
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"Hello, world" from seemingly random numbers? A clever use of seeded randomness hides a string within. Can you crack the code?

Why does `System.out.println(randomString(-229985452) + " " + randomString(-147909649));` print "hello world"? The `randomString` function uses a seeded random number generator to build a string; how does the seed affect the output?

Solution in a Nutshell

The Stack Overflow question explores a seemingly magical "Hello, World!" output from code generating random strings. The trick lies in the specific seed used for the Random object. A predictable seed leads to a predictable sequence of "random" numbers, and thus, a predictable output.

Problem: The code uses a fixed seed, making the "random" strings deterministic.

Solution: Use a non-deterministic seed for true randomness. For example, use System.currentTimeMillis() which provides a constantly changing seed based on the system's time.

Example (Java):

import java.util.Random;

public class RandomStringGenerator {
    public static void main(String[] args) {
        // Non-deterministic seed
        Random random = new Random(); //or new Random(System.currentTimeMillis());

        // ... (rest of the string generation logic from SO question) ...
        //  This part would involve generating the string based on the random numbers from random.nextInt()
    }
}

Spring Boot Context: In a Spring Boot application, you can inject Random directly via dependency injection. The behaviour remains the same; using the default constructor provides a non-deterministic seed, ensuring genuinely random strings each execution.

SEO Keywords: Java, Spring Boot, Random, Random String Generator, Random Seed, Deterministic, Non-deterministic, java.util.Random, System.currentTimeMillis(), Seed Value.

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