package com.net.xinfang.reflect;

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;

/***

* Array、Set、List、Map相互转换

* @author xinfang

*

*/

public class ConvertorTest {

/**

* @param args

*/

public static void main(String[] args) {

testList2Array();//List-Array

testArray2List();//Array-List

testSet2List();//Set-List

testList2Set();//List-Set

testSet2Array();//Set-Array

testArray2Set();//Array-Set

testMap2Set();//Map-Set

testMap2List();//Map-List

}

private static void testMap2List() {

Map map = new HashMap();

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

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

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

// 将Map Key 转化为List

List mapKeyList = new ArrayList(map.keySet());

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

// 将Map Key 转化为List

List mapValuesList = new ArrayList(map.values());

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

}

private static void testMap2Set() {

Map map = new HashMap();

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

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

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

// 将Map 的键转化为Set

Set mapKeySet = map.keySet();

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

// 将Map 的值转化为Set

Set mapValuesSet = new HashSet(map.values());

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

}

private static void testArray2Set() {

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

// 数组-->Set

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

System.out.println(set);

}

private static void testSet2Array() {

Set set = new HashSet();

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 list = new ArrayList();

list.add("ABC");

list.add("EFG");

list.add("LMN");

list.add("LMN");

// List-->Set

Set listSet = new HashSet(list);

System.out.println(listSet);

}

private static void testSet2List() {

Set set = new HashSet();

set.add("AA");

set.add("BB");

set.add("CC");

// Set --> List

List setList = new ArrayList(set);

System.out.println(setList);

}

private static void testList2Array() {

// List-->数组

List list = new ArrayList();

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 list1 = Arrays.asList(ss);

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

System.out.println(list1);

System.out.println(list2);

}

}