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The Static Initializer for a Static HashMap We can also initialize the map using the double-brace syntax: Map<String, String> doubleBraceMap = new HashMap<String, String>() {{ put("key1", "value1"); put("key2", "value2"); }};
Initializing map using map literals: Map literal is the easiest way to initialize a map with data just simply separate the key-value pair with a colon and the last trailing colon is necessary if you do not use, then the compiler will give an error.
What exactly do you want to initialize to zero? map's default constructor creates empty map. You may increase map's size only by inserting elements (like m["str1"]=0 or m. insert(std::map<std::string,int>::value_type("str2",0)) ).
One allows you to initialize capacity, one allows you to initialize values:
// Initializes a map with space for 15 items before reallocation
m := make(map[string]int32, 15)
vs
// Initializes a map with an entry relating the name "bob" to the number 5
m := map[string]int{"bob": 5}
For an empty map with capacity 0, they're the same and it's just preference.
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