數組與list、set、map相互轉換

一、數組與list轉換

@Test
	public void array2List() {
		String[] strArray = { "aaa", "bbb", "ccc" };
		List<String> strList = new ArrayList<>();
		CollectionUtils.addAll(strList, strArray);
		logger.info("strList:{}",JSON.toJSONString(strList));
	}
	
	@Test
	public void array2List2() {
		String[] strArray = { "aaa", "bbb", "ccc" };
		List<String> strList =Arrays.asList(strArray);
		logger.info("strList:{}",JSON.toJSONString(strList));
	}

二、數組與set轉換

@Test
	public void array2Set() {
		String[] strArray = { "aaa", "bbb", "ccc" };
		Set<String> strSet = new HashSet<>();
		CollectionUtils.addAll(strSet, strArray);
		logger.info("strSet:{}",JSON.toJSONString(strSet));
	}
    @Test
	public void array2Set2() {
		String[] strArray = { "aaa", "bbb", "ccc" };
		Set<String> strSet = new HashSet<>(Arrays.asList(strArray));
		logger.info("strSet:{}",JSON.toJSONString(strSet));
	}

三、List與Set轉換

@Test
	public void list2Set(){
		String[] strArray = { "aaa", "bbb", "ccc" };
		List<String>list=Arrays.asList(strArray);
		Set<String> strSet = new HashSet<>(list);
		logger.info("strSet:{}",JSON.toJSONString(strSet));
	}

四、Set與List轉換

@Test
	public void set2List(){
		String[] strArray = { "aaa", "bbb", "ccc" };
		Set<String> strSet = new HashSet<>(Arrays.asList(strArray));
		List<String>strList=new ArrayList<>(strSet);
		logger.info("strList:{}",JSON.toJSONString(strList));
	}

五、Map與Set轉換

@Test
	public void map2Set(){
		Map<String,String>map=new HashMap<>();
		map.put("aa", "bb");
		map.put("cc", "dd");
		Set<String> strSet=map.keySet();
		logger.info("strSet:{}",JSON.toJSONString(strSet));
		
		Set<String> strSet2=new HashSet<>(map.values());
		logger.info("strSet2:{}",JSON.toJSONString(strSet2));
	}

六、Map與List轉換

@Test
	public void map2List(){
		Map<String,String>map=new HashMap<>();
		map.put("aa", "bb");
		map.put("cc", "dd");
		List<String> strList=new ArrayList<>(map.keySet());
		logger.info("strList:{}",JSON.toJSONString(strList));
		
		List<String> strList2=new ArrayList<>(map.values());
		logger.info("strList2:{}",JSON.toJSONString(strList2));
	}