抽奖系统（二）

package lotterydraw;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;

public class lotterDraw {

public static void main(String[] args) {
    ArrayList <Integer> number = new ArrayList<>();
    Random random = new Random();


     for(int i=0;i<2000;i++){
        int A=i;
        number.add(A);
    }
    Collections.shuffle(number);
    int A = random.nextInt(2000);
    System.out.println("一等奖："+number.get(A)+"\n");
    number.remove(A);
    for(int i=1;i<3;i++){
        Collections.shuffle(number);
        int B = random.nextInt(2000-i);
        System.out.println("二等奖；"+number.get(B)+"\n");
        number.remove(B);


}

    for(int i=1;i<4;i++){
        Collections.shuffle(number);
        int B = random.nextInt(1997-i);
        System.out.println("三等奖；"+number.get(B)+"\n");
}





}
}

来源：https://www.cnblogs.com/2014330122wwh/p/5484348.html