package com.swift.lianxi; import java.util.HashSet; import java.util.Random; /*训练知识点:HashSet 训练描述 双色球规则:双色球每注投注号码由6个红色球号码和1个蓝色球号码组成. 红色球号码从1—33中选择:蓝色球号码从1—16中选择.请随机生成一注双色球号码*/ public class Test4 { public static void main(String[] args) { Random ran =…
import java.util.ArrayList; import java.util.Iterator; public class StringSampleDemo { public static void main(String[] args) { ArrayList al = new ArrayList(); al.add(new Student("zhangsan1", 20, "男")); al.add(new Student("zhangsa…
http://blog.csdn.net/qkxh320/article/details/16115671 1.首先操作mongodb最基本命令:: show databases; ---------------------显示全部数据库 use 数据库名; --------------------切换到指定数据库 show collections; --------------------显示该数据库下的全部表 之后就可以执行相应增删改查语句了! 2.…
用递归进行排序 , 用TreeSet 去重. public class test { public static void main(String []args){ String str = "AVCV"; TreeSet set = new TreeSet(); List list = digui(str); System.out.println(list.size()); for(Object o :list){ set.add(o.toString()); } } public…
方法一:使用Set List<User> newList = new ArrayList<User>(); Set<String> set = new HashSet<String>(); for (User user : list) { String userName = user.getName(); if (!set.contains(userName)) { //set中不包含重复的 set.add(userName); newList.add(us…