Java导入java.util.Random后仍提示cannot find symbol问题求助

Hey there! Let's break down why you're hitting that frustrating "cannot find symbol" error even after importing java.util.Random.

The Most Likely Culprit #

From your code snippet, it looks like you're trying to use something like ra... (probably a Random instance) to generate your dice values—but you never created an instance of the Random class! Importing the class just tells the compiler where to find it, but you need to actually instantiate it to use its methods.

Here's How to Fix It #

1. First, create a Random object inside your main method (right before you need to generate rolls):

   Random rand = new Random();
   

2. Then use this instance to generate your dice rolls (since dice are 1-6, we use nextInt(6) + 1 to get values in that valid range):

Corrected Code Snippet #

import java.util.Random;

public class dobbelsteen {
    public static void main(String[] args) {
        int dobb1;
        int dobb2;
        int dobb3;
        int dobb4;
        int dobb5;
        boolean alldobb = true;
        
        // Create Random instance here
        Random rand = new Random();
        
        do {
            dobb1 = rand.nextInt(6) + 1;
            dobb2 = rand.nextInt(6) + 1;
            dobb3 = rand.nextInt(6) + 1;
            dobb4 = rand.nextInt(6) + 1;
            dobb5 = rand.nextInt(6) + 1;
            
            // Example check for all dice being the same
            alldobb = (dobb1 == dobb2 && dobb2 == dobb3 && dobb3 == dobb4 && dobb4 == dobb5);
        } while (!alldobb);
    }
}

Other Quick Checks #

• Double-check variable spelling: If you named your Random instance something else (like random instead of rand), make sure you're using the exact same name when calling nextInt().
• Side note: While not an error, Java convention uses PascalCase for class names—so Dobbelsteen instead of dobbelsteen would be more standard.

内容的提问来源于stack exchange，提问作者Frank