Leeched from: http://stackoverflow.com/a/6409791

import java.util.NavigableMap;
import java.util.Random;
import java.util.TreeMap;

/**
 * @author 		Bjorn Krols (Botre)
 * @version		0.0
 * @since		April 27, 2015
 */

public class RandomCollection<Generic> {

	private final NavigableMap<Double, Generic> map;
	
    private final Random random;
    
    private double total = 0;

    public RandomCollection() {
        this(new Random());
    }

    public RandomCollection(Random random) {
        this.random = random;
        map = new TreeMap<Double, Generic>();
    }

    public void add(double weight, Generic result) {
        if (weight <= 0) return;
        total += weight;
        map.put(total, result);
    }

    public Generic get() {
        double value = random.nextDouble() * total;
        return map.ceilingEntry(value).getValue();
    }
	
}

public static void main(String[] args) {
	RandomCollection<String> rc = new RandomCollection<String>();
	rc.add(1, "1");
	rc.add(1, "2");
	System.out.println(rc.get());
	
}

Edited April 27, 201510 yr by Botre

 

oh you

 

oh you

 

 

(it's auto-generated )

 

Leeched from: http://stackoverflow.com/a/6409791

import java.util.NavigableMap;
import java.util.Random;
import java.util.TreeMap;

/**
 * @author 		Bjorn Krols (Botre)
 * @version		0.0
 * @since		April 27, 2015
 */

public class RandomCollection<Generic> {

	private final NavigableMap<Double, Generic> map;
	
    private final Random random;
    
    private double total = 0;

    public RandomCollection() {
        this(new Random());
    }

    public RandomCollection(Random random) {
        this.random = random;
        map = new TreeMap<Double, Generic>();
    }

    public void add(double weight, Generic result) {
        if (weight <= 0) return;
        total += weight;
        map.put(total, result);
    }

    public Generic get() {
        double value = random.nextDouble() * total;
        return map.ceilingEntry(value).getValue();
    }
	
}

public static void main(String[] args) {
	RandomCollection<String> rc = new RandomCollection<String>();
	rc.add(1, "1");
	rc.add(1, "2");
	System.out.println(rc.get());
	
}

 

Hhm, what exactly does this do.

 

@ragfr00b

 

It's for basically having a meh random don't know why people would use this as it's much more simpler to keep track of em using a random if pseudo every couple of runs.