数组与list、set、map相互转换

青旅半醒 2022-01-15 00:49 479阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

# 1、数组与list转换 #

@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));
    	}

# 2、数组与set转换 #

@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));
    	}

# 3、List与Set转换 #

@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));
    	}

# 4、Set与List转换 #

@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));
    	}

# 5、Map与Set转换 #

@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));
    	}

# 6、Map与List转换 #

@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));
    	}

转载于:https://my.oschina.net/u/182501/blog/1486848

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/7fed74e1b5084b97abe2c5d7e2c4a2b1.png