Java中 map.values转换为list或者string[]

Posted 2020-06-14

    @Test
    public void testMap2List() throws Exception{
        Map<String, String> map = new HashMap<String, String>();
        map.put("1", "AA");
        map.put("2", "BB");
        map.put("3", "CC");
        map.put("4", "DD");

        Collection<String> valueCollection = map.values();
        final int size = valueCollection.size();

        List<String> valueList = new ArrayList<String>(valueCollection);

        String[] valueArray = new String[size];
        map.values().toArray(valueArray);
    }