How to quickly create instances of List and Map with initial values ​​in Java

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The way to initialize a List and Map object and add values ​​is as follows:

List<String> sList = new ArrayList<String>(); 
sList.add("str1"); 
sList.add("str2");

Map<String,String> sMap = new HashMap<String, String>(); 
sMap.put("k1", "v1"); 
sMap.put("k2", "v2");

This operation can also be implemented with the following code, which can make the code look like Neater:

List<String> sList = Arrays.asList("str1", "str2");//这种方法生成的list，是不支持添加或删除元素的

private Map<Integer, String> newsEventMap = new HashMap<Integer, String>(){{ 
put("k1","v1"); 
put("k2","v2"); 
}};

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