Random Numbers?

How do i generate a random number between ## and ##?

 

http://docs.oracle.com/javase/6/docs/api/java/util/Random.html

Assuming you want an integer:

PHP:

// returns random value between lower and upper inclusive
// assumes lower is actually smaller than upper!
public int getRandom(int lower, int upper) {
    return new Random.nextInt((upper - lower) + 1) + lower;
}


 

do i need to make lower and upper equal something before this
like this

Code:

int lower = 0;
int upper = 1;
 
public int getRandom(int lower, int upper) {
    return new Random.nextInt((upper - lower) + 1) + lower;
}

 

Something like that. What Desht posted was a function, with upper and lower being the parameters. You would type

getRandom(0,5);

to return a random value between 0 and 5 (including 5). This is merely an example but you get the idea.

 

Random.nextInt cannot be resolved to a type

 

What about something like this;

Code:java

 
int upper = 5;
Random random = new Random();
random.nextInt(upper)
 

Return a value between 0 and 5; or you can do;

Code:java

 
int upper = 5;
Random random = new Random();
random.nextInt(5+(upper))
 

Return a value between 5 and 10

 

rather:

int x = getRandom(0,5);

His function should return an integer, so the above should work, no?

 

Would this work

Code:

@EventHandler
    public void onplayerjoin(PlayerJoinEvent event){
        Player p = event.getPlayer();
       
        int upper = 5;
 
        Random random = new Random();
 
        p.sendMessage("Random Number: " + random.nextInt(5+(upper)));
    }

if so how do i get a random number between 1,500,000 and 10,000,000

i cant test that because the function gives an error in Eclipse

got it working but how do i get it to add the commas

Code:

package me.icyrelic.com;
 
import java.util.Random;
 
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
 
public class PlayerJoin implements Listener {
   
    OutOnBail plugin;
    public PlayerJoin(OutOnBail instance) {
 
        plugin = instance;
 
        }
   
    @EventHandler
    public void onplayerjoin(PlayerJoinEvent event){
        Player p = event.getPlayer();
       
 
        p.sendMessage("Random Number getRandom: " + getRandom(1500000,10000000));
    }
   
    public int getRandom(int lower, int upper) {
        Random random = new Random();
        return random.nextInt((upper - lower) + 1) + lower;
    }
       
 
}

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

What commas? The code you posted above looks OK to me.

 

it sends this

Random Number: 1000000
i want it to send
Random Number: 1,000,000

 

I would suggest typing "java commas in numbers" into Google. There are a ton of answers and examples.

 

found this

Code:

private String insertCommas(String str)
    {
        if(str.length() < 4){
            return str;
        }
        return insertCommas(str.substring(0, str.length() - 3)) + "," + str.substring(str.length() - 3, str.length());
    }

but the number isnt a string and i cant do .toString() on it so how do i make it a string

i got it working

Code:

package me.icyrelic.com;
 
import java.util.Random;
 
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
 
public class PlayerJoin implements Listener {
   
    OutOnBail plugin;
    public PlayerJoin(OutOnBail instance) {
 
        plugin = instance;
 
        }
   
    @EventHandler
    public void onplayerjoin(PlayerJoinEvent event){
        Player p = event.getPlayer();
        int num = getRandom(1500000,10000000);
        plugin.getServer().broadcastMessage("Judge: " + p.getName() + "'s Bail Set To: " + insertCommas(convertInteger(num)));
       
       
       
       
    }
   
    public int getRandom(int lower, int upper) {
        Random random = new Random();
        return random.nextInt((upper - lower) + 1) + lower;
    }
   
    private String insertCommas(String str)
    {
        if(str.length() < 4){
            return str;
        }
        return insertCommas(str.substring(0, str.length() - 3)) + "," + str.substring(str.length() - 3, str.length());
    }
   
    public static String convertInteger(int i) {
        return Integer.toString(i);
    }
       
 
}

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

I recommend doing this to format the number:

Code:java

 
public String format(int number)
{ DecimalFormat  formatter = new DecimalFormat("#,###,###");
return formatter.format(number);
}