Java获取随机不重复的数得值
假如我有一个数组： ArrayList<Integer> mArrayList = new ArrayList<Integer>(); mArrayList.add(0); mArrayList.add(1); mArrayList.add(2); mArrayList.add(3); 我需要从中随机抽取2个数 不能重复抽取，我会用这个方法 public void getValue(ArrayList<Integer> mArrayList){ Random mRandom = new Random(); int a = mRandom.nextInt(mArrayList.size()); int value = mArrayList.get(a); System.out.println(value + ""); mArrayList.remove(a); } 原理是每抽取一次删除已经抽取出来的值，这样获取到的值不会重复了 完整代码： package com.xiaoqiu.test; import java.util.ArrayList; import java.util.Random; public class Test { public static void main(String[] args) { ArrayList<Integer> mArrayList = new ArrayList<Integer>(); mArrayList.add(0); mArrayList.add(1); mArrayList.add(2); mArrayList.add(3); Test mTest = new Test(); mTest.getValue(mArrayList); mTest.getValue(mArrayList); } public void getValue(ArrayList<Integer> mArrayList){ Random mRandom = new Random(); int a = mRandom.nextInt(mArrayList.size()); int value = mArrayList.get(a); System.out.println(value + ""); mArrayList.remove(a); } } 测试结果： 3 2 3 0 2 3
