Java

来源：互联网发布：淘宝买来的模板怎么装编辑：程序博客网时间：2024/06/08 11:30
import java.util.*;/** * Created by Administrator on 2017/5/19. */public class ConvertorTest {    /**     * @param args     */    public static void main(String[] args) {        testList2Array();        testArray2List();        testSet2List();        testList2Set();        testSet2Array();        testArray2Set();        testMap2Set();        testMap2List();    }    /*-------------------------------map/list---------------------------------*/    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 value 转化为List        List<String> mapValuesList = new ArrayList<String>(map.values());        System.out.println("mapValuesList:" + mapValuesList);    }    /*----------------------------------map/set------------------------------*/    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);    }    /*---------------------------array/set-----------------------------*/    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));    }    /*----------------------------list/set-----------------------------*/    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);    }    /*--------------------------------list/array----------------------------*/    private static void testList2Array() {        //List-->数组 ：list.toArray        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 ：Arrays.asList        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);    }}