两个list 合并后去除掉重复removeAll()的，然后再随机获取最后list中的 几个值

public static void test1(){
    String s1="1,2,5,3,6,9";
    String n1[]=s1.split(",");
    System.out.println("n1length="+n1.length);
    String s2="2,3";
    String n2[]=s2.split(",");
    System.out.println("n2length="+n2.length);
    List<String> list1=new ArrayList<>();
    for(int i=0;i<n1.length;i++){
        list1.add(n1[i]);
    }

    List<String> list2=new ArrayList<>();
    for(int i=0;i<n2.length;i++){
        list2.add(n2[i]);
    }
    System.out.println("list1="+list1);
    System.out.println("list2="+list2);
    list1.addAll(list2);
    List<String> list=new ArrayList<String>();
    list=list1;
    list1.removeAll(list2);
    System.out.println("list="+list );
    int number=2;
    List<String> result=new ArrayList<>();
    for(int i = 0;i<number;i++){
        //显示数字并将其从列表中删除,从而实现不重复.
        int  random=new Random().nextInt(list.size());
        System.out.println("第"+i+"随机数："+random);
        result.add(list.get(random));
        System.out.println(list.remove(random));

    }
    System.out.println("结果："+result);
}