生产范围内的随机数

最新推荐文章于 2023-12-17 10:36:36 发布

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/**
 * 产生范围内的随机整数数
 *  带种子时每次产生的随机数相同
 */
public class RandomInt {
    public static void main(String[] args) {

        RandomInt.showList(RandomInt.getIntRandom(10,5,15));
        System.out.println("*************************");
        RandomInt.showList(RandomInt.getIntRandom(10,5,15,10));

    }
    public static List<Integer> getIntRandom(int num,int boundMin,int boundMax){
        
        return getInt(num,boundMin,boundMax,null);
    }
    public static List<Integer> getIntRandom(int num,int boundMin,int boundMax,long seed){
        
        return getInt(num,boundMin,boundMax,seed);
    }
    private static List<Integer> getInt(int num,int boundMin,int boundMax,Long seed){
        
        List<Integer> list = new ArrayList<Integer>();
        Random random = new Random();
        
        if(seed != null){
            random.setSeed(seed);
        }
        
        for(int i=0;i<num;i++){
            list.add(random.nextInt(boundMax-boundMin+1)+boundMin);
        }
        
        return list;
    }
    
    public static void showList(List list){
        
        for (Object a:list) {
            System.out.println(a);
        }
    }
}