package com.example.test;  

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;  

public class ConvertorTest {  

    /**

     * @param args

     */

    public static void main(String[] args) {  

        testList2Array();

        testArray2List();

        testSet2List();

        testList2Set();

        testSet2Array();

        testArray2Set();

        testMap2Set();

        testMap2List();

    }  

    private static void testMap2List() {  

        Map<String, String> map = new HashMap<String, String>();

        map.put("A", "ABC");

        map.put("K", "KK");

        map.put("L", "LV");    

        // 将Map Key 转化为List

        List<String> mapKeyList = new ArrayList<String>(map.keySet());

        System.out.println("mapKeyList:"+mapKeyList);  

        // 将Map Key 转化为List

        List<String> mapValuesList = new ArrayList<String>(map.values());

        System.out.println("mapValuesList:"+mapValuesList);  

    }  

    private static void testMap2Set() {  

        Map<String, String> map = new HashMap<String, String>();

        map.put("A", "ABC");

        map.put("K", "KK");

        map.put("L", "LV");    

        // 将Map 的键转化为Set

        Set<String> mapKeySet = map.keySet();

        System.out.println("mapKeySet:"+mapKeySet);  

        // 将Map 的值转化为Set

        Set<String> mapValuesSet = new HashSet<String>(map.values());

        System.out.println("mapValuesSet:"+mapValuesSet);

    }  

    private static void testArray2Set() {  

        String[] arr = {"AA","BB","DD","CC","BB"};    

        //数组-->Set

        Set<String> set = new HashSet<String>(Arrays.asList(arr));

        System.out.println(set);

    }  

    private static void testSet2Array() {

        Set<String> set = new HashSet<String>();

        set.add("AA");

        set.add("BB");

        set.add("CC");  

        String[] arr = new String[set.size()];

        //Set-->数组

        set.toArray(arr);

        System.out.println(Arrays.toString(arr));

    }  

    private static void testList2Set() {  

        List<String> list = new ArrayList<String>();

        list.add("ABC");

        list.add("EFG");

        list.add("LMN");

        list.add("LMN");  

        //List-->Set

        Set<String> listSet = new HashSet<String>(list);

        System.out.println(listSet);

    }  

    private static void testSet2List() {  

        Set<String> set = new HashSet<String>();

        set.add("AA");

        set.add("BB");

        set.add("CC");  

        //Set --> List

        List<String> setList = new ArrayList<String>(set);

        System.out.println(setList);

    }  

    private static void testList2Array() {

        //List-->数组

        List<String> list = new ArrayList<String>();

        list.add("AA");

        list.add("BB");

        list.add("CC");

        Object[] objects = list.toArray();//返回Object数组

        System.out.println("objects:"+Arrays.toString(objects));    

        String[] arr = new String[list.size()];

        list.toArray(arr);//将转化后的数组放入已经创建好的对象中

        System.out.println("strings1:"+Arrays.toString(arr));

    }  

    private static void testArray2List() {

        //数组-->List

        String[] ss = {"JJ","KK"};

        List<String> list1 = Arrays.asList(ss);

        List<String> list2 = Arrays.asList("AAA","BBB");

        System.out.println(list1);

        System.out.println(list2);

    }  

}