Random selection

[OberSchuze]

Hello, I am trying to create a random number selector for a 1 to 24 set. This is the code that I have come up with for creating a random seed but it does not seem to work. Could anyone tell me what I am doing wrong please.

import java.util.*;


public class randomgen{
  public static void main(String[] args){
  Random rand = new Random();
  int num1 = rand.nextInt(24);
  System.out.println("Generated Random Number between 0 to 24 is : " + num1);
  int num2 = rand.nextInt(num1);
  System.out.println("Generated Random Number from seed 1 is : " + num2);
  int num3 = rand.nextInt(num2);
  System.out.println("Generated Random Number from seed 2 is : " + num3);
  }
}

[DarrylBurke]

The parameter to the nextInt(...) method is not the seed. Read the API.

db

[OberSchuze]

I rebuilt the code, here:

	public class randomgen {

	    private static void doRawRandomNumber() {

	        int rawRandomNumber;
	        int min = 1;
	        int max = 18;

	        for (int i = 0; i < 500; i++) {
	            rawRandomNumber = (int) (Math.random() * (max - min + 1) ) + min;
	            System.out.println("Random number : " + rawRandomNumber);
	        }

	        System.out.println("\n");
	    }


	    /**
	     * Sole entry point to the class and application.
	     * @param args Array of String arguments.
	     */
	    public static void main(String[] args) {
	        doRawRandomNumber();
	    }

	}

But now when I test it running in debug I get this message in console: Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/ref/FinalReference


EDIT: NM figured it out.

[OberSchuze]

Here is my final code generation it works great. Now on to using the time variable to power the random number trigger time.

public class randomgen {

	    private static void doRawRandomNumber() {

	        int rawRandomNumberCB;
	        int mincb = 1;
	        int maxcb = 18;
	        
	        int rawRandomNumberT;
	        int mint = 6;
	        int maxt = 30;

	        for (int i = 0; i < 500; i++) {
	            rawRandomNumberCB = (int) (Math.random() * (maxcb - mincb + 1) ) + mincb;
	            rawRandomNumberT = (int) (Math.random() * (maxt - mint + 1) ) + mint;
	            System.out.printf("Random Time and Circuit Breaker:\n"
	                    + "Circuit Breaker: " + rawRandomNumberCB
	                    +"\n"
	                    + "Time: " + rawRandomNumberT + "\n");
	        }

	    }


	    /**
	     * Sole entry point to the class and application.
	     * @param args Array of String arguments.
	     */
	    public static void main(String[] args) {
	        doRawRandomNumber();
	    }

	}

[OberSchuze]

I am now trying to add a timer function to my file here so that after the 5th number set is generated it stops. I am not sure what I am doing wrong as what I have written has not tossed up any errors. Any help would be appreciated.

import java.util.TimerTask;

public class randomgen {

    class MyTask extends TimerTask{
    	private int times = 0;
    	
    	public void run() {
    		times++;
    		if (times <=5){
    			
    		}
    		else {
    			this.cancel();
    		}
    	}
    }
	    private static void doRawRandomNumber() {
	        int rawRandomNumberCB;
	        int mincb = 1;
	        int maxcb = 18;
	        
	        int rawRandomNumberT;
	        int mint = 6;
	        int maxt = 30;

	        for (int i = 0; i < 500; i++) {
	            rawRandomNumberT = (int) (Math.random() * (maxt - mint + 1) ) + mint;
	            try{
	            Thread.sleep(rawRandomNumberT * 1000);
	            } catch (InterruptedException e) {}
	        	rawRandomNumberCB = (int) (Math.random() * (maxcb - mincb + 1) ) + mincb;

	            System.out.printf("Random Time and Circuit Breaker:\n"
	                    + "Circuit Breaker: " + rawRandomNumberCB
	                    +"\n"
	                    + "Time: " + rawRandomNumberT 
	                    + "\n");
	        }
        }
	    /**
	     * Sole entry point to the class and application.
	     * @param args Array of String arguments.
	     */
        MyTask t = new MyTask();
	    public static void main(String[] args) {
	        doRawRandomNumber();
	    }


	}