權重隨機算法在抽獎，資源調度等系統中應用還是比較廣泛的，一個簡單的按照權重來隨機的實現，權重為幾個隨機對象(分類)的命中的比例，權重設置越高命中越容易，之和可以不等于100；

簡單實現代碼如下：

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

public class WeightRandom {

static List categorys = new ArrayList();

private static Random random = new Random();

public static void initData() {

WeightCategory wc1 = new WeightCategory("A",60);

WeightCategory wc2 = new WeightCategory("B",20);

WeightCategory wc3 = new WeightCategory("C",20);

categorys.add(wc1);

categorys.add(wc2);

categorys.add(wc3);

}

public static void main(String[] args) {

initData();

Integer weightSum = 0;

for (WeightCategory wc : categorys) {

weightSum += wc.getWeight();

}

if (weightSum <= 0) {

System.err.println("Error: weightSum=" + weightSum.toString());

return;

}

Integer n = random.nextInt(weightSum); // n in [0, weightSum)

Integer m = 0;

for (WeightCategory wc : categorys) {

if (m <= n && n < m + wc.getWeight()) {

System.out.println("This Random Category is "+wc.getCategory());

break;

}

m += wc.getWeight();

}

}

}

class WeightCategory {

private String category;

private Integer weight;

public WeightCategory() {

super();

}

public WeightCategory(String category, Integer weight) {

super();

this.setCategory(category);

this.setWeight(weight);

}

public Integer getWeight() {

return weight;

}

public void setWeight(Integer weight) {

this.weight = weight;

}

public String getCategory() {

return category;

}

public void setCategory(String category) {

this.category = category;

}

}

總結

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